Engine Mechanical - 2.0l (Ltg) or 2.5l (Lcv) - Repair Instructions - off Vehicle Cadillac ATS I

Draining Fluids and Oil Filter Removal

1. Remove the oil filter (1). Remove the oil pan drain plug and allow the oil to drain out.
2. Clean the oil filter housing in the engine block.
3. Install the oil pan drain plug and tighten to 25 N.m (18 lb ft).
4. If cleaning or repairing the engine block, it is not necessary to reinstall the plug.

Crankshaft Balancer Removal

Special Tools

1. EN-41816 Crankshaft Balancer Remover
2. EN-41816-A Crankshaft End Protector
3. EN 50792 Flywheel Holding Tool

For equivalent regional tools, refer to Special Tools .

1. To prevent crankshaft rotation, install EN 50792 holding tool (2) and starter motor bolts (1) at the starter motor location and engaging the flywheel.
2. Remove and discard the crankshaft balancer bolt (1) and washer.
3. Install EN-41816-A protector to protect the crankshaft end during balancer removal.
4. Using EN-41816 remover , remove the balancer (2).
5. Remove the special tools.

Engine Flywheel Removal

Special Tools

EN 50792 Flywheel Holding Tool

For equivalent regional tools, refer to Special Tools .

1. To prevent crankshaft rotation, install EN 50792 holding tool (2) and starter motor bolts (1) at the starter motor location and engaging the flywheel.
2. Remove and discard the flywheel attaching bolts (1).
3. Remove the flywheel (2).
4. Remove EN 50792 holding tool.

Intake Manifold Removal

1. Remove the oil fill cap (6).
2. Remove the fuel pump insulator (1).
3. Remove the intake manifold cover bolt (5).
4. Remove the intake manifold cover (4).
5. Remove the upper intake manifold bracket bolt (3).
6. Remove the upper intake manifold bracket (3).
7. Remove the EVAP canister valve (1).
8. Remove the EVAP canister valve pipe assembly (2).
9. Remove the radiator inlet pipe bolt (1).
10. Disconnect the radiator inlet hose from the water outlet assembly, and remove the radiator inlet pipe and hose assembly (2).
11. Remove the throttle body bolts (3).
12. Remove the throttle body (1) and seal (2).
13. Remove the fuel pump cover bolts (1) and fuel pump cover (2).
14. Remove the fuel feed pipe stud (3) and the fuel fed pipe (4).
15. Remove the fuel pump insulator (6).
16. Remove and discard the fuel feed intermediate pipe (7).
17. Remove the fuel pump bolts (5).
18. Remove the fuel pump (4), O-ring (2), and gasket (3).
19. Remove the valve lifter follower (1).
20. Remove the MAP sensor (2) and bolt (1).
21. Remove the intake manifold retaining bolts (3, 4).
22. Remove the intake manifold (2) and gasket (1).
23. If the intake manifold needs to be replaced, transfer the throttle body to the new intake manifold.

Automatic Transmission Flex Plate Removal

Special Tools

EN 50792 Flywheel Holding Tool

For equivalent regional tools, refer to Special Tools .

1. To prevent crankshaft rotation, install EN 50792 holding tool (2) and starter motor bolts (1) at the starter motor location and engaging the flywheel.
2. Remove and discard the flywheel attaching bolts (1).
3. Remove the flywheel (2).
4. Remove EN 50792 holding tool.

Turbocharger Removal

1. Remove the turbocharger heat shield bolts (1, 3).
2. Remove the turbocharger heat shield (2).
3. Remove the turbocharger wastegate actuator arm retainer (3).
4. Remove the turbocharger wastegate actuator bolts (1) and actuator (2).
5. Remove the camshaft cover heat shield bolt (1) that retains the turbocharger coolant return pipe (2) at the camshaft cover.
6. Disconnect the turbocharger coolant return pipe from the air bleed hose.
7. Remove the turbocharger coolant return pipe bolt (3).
8. Remove the turbocharger coolant return pipe (2) and washers (4, 5). Discard the washers.
9. Remove the turbocharger coolant feed pipe bolts (1, 3).
10. Disconnect the turbocharger coolant feed pipe hose from the engine oil cooler.
11. Remove the turbocharger coolant feed pipe gasket (4) and discard.
12. Remove the turbocharger coolant feed pipe (5) and washers (2). Discard the washers.
13. Disconnect the turbocharger wastegate regulator solenoid valve hoses from the turbocharger.
14. Remove the turbocharger wastegate regulator solenoid valve bracket bolt (2).
15. Remove the turbocharger wastegate regulator solenoid valve (1).
16. Remove the turbocharger bypass valve solenoid bolts (1).
17. Remove the turbocharger bypass valve solenoid (2).
18. Remove the PCV hose fitting bolt (2). Disconnect the PCV hose fitting (1) with the PCV hose attached from the turbocharger.
19. Remove the turbocharger nuts (2) and discard.
20. Remove the turbocharger oil feed and return pipe bolts (6) at the engine block.
21. Remove the turbocharger (1) with the oil return pipe and oil feed pipe attached.
22. Remove the turbocharger oil feed and oil return pipe gaskets (4, 5) and discard.
23. Remove the turbocharger gasket (3) and discard.
24. Remove the turbocharger oil feed pipe bolt (1) from the turbocharger.
25. Remove the turbocharger oil feed pipe (2) and washers (3). Discard the washers.
26. Remove the turbocharger oil return pipe bolts (6).
27. Remove the turbocharger oil return pipe (5).
28. Remove and discard the turbocharger oil return pipe gasket (4).
29. Clean and inspect the turbocharger and components. Refer to «Turbocharger Cleaning and Inspection»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle) .

Exhaust Manifold Removal (LTG)

1. Remove the exhaust manifold heat shield bolts (2).
2. Remove the exhaust manifold heat shield (1).
3. Remove the exhaust manifold brace nuts (1) and discard.
4. Remove the exhaust manifold brace bolts (3).
5. Remove the exhaust manifold brace (2).
6. Remove and discard the exhaust manifold to cylinder head bolts (3).
7. Remove the exhaust manifold (1).
8. Remove and discard the exhaust manifold gasket (2).
9. Clean all of the sealing surfaces.

Exhaust Manifold Removal (LCV)

1. Remove the oxygen sensor (1).
2. Remove the exhaust manifold heat shield bolts (2).
3. Remove the exhaust manifold heat shield (1).
4. Remove and discard the exhaust manifold to cylinder head bolts (3).
5. Remove the exhaust manifold (2).
6. Remove and discard the exhaust manifold gasket (1).
7. Clean all of the sealing surfaces.
8. If the exhaust manifold is being replaced, transfer the following parts: The exhaust manifold heat shield The oxygen sensor

Secondary Air Injection Check Valve Removal

1. Remove the secondary air injection check valve bolts (3).
2. Remove the secondary air injection check valve assembly (2).
3. Remove and discard the check valve gasket (1).

Fuel Rail and Injectors Removal

Special Tools

EN-49248 Fuel Rail Assembly Remover

For equivalent regional tools, refer to Special Tools

1. Remove the fuel injection fuel rail noise shield (1).
2. Disconnect the electrical harness from the fuel rail harness connection.
3. Remove the fuel rail assembly retaining bolts and upper rubber grommet, if necessary.
4. Install EN-49248 studs (1) into the 2 outermost fuel rail assembly retaining bolt locations. Tighten the studs to 22 N.m (16 lb ft).
5. Install EN-49248 remover (2) onto each stud, and engage the hooks to the fuel rail. Install the nuts (3) retaining the remover onto the studs and tighten until snug.
6. Using EN-49248 remover , remove the fuel rail assembly.

Camshaft Cover Removal (LCV)

1. Remove the PCV hose assembly (1) at the quick-connect fittings.
2. Remove the engine coolant air bleed pipe (2), bolt (1), and O-ring (3). Inspect O-rings and discard if necessary.
3. Remove the oil level indicator (3). Inspect and replace the oil indicator O-ring seals (4), if necessary.
4. Remove the camshaft cover heat shield (2) and bolts (1).
5. Remove the rear lift bracket (1) and bolts (2).
6. Remove the front lift bracket (2) and bolts (1).
7. Remove the ignition coils (2) and bolts (1).
8. Remove the camshaft position actuator control solenoid valves (2) and bolts (1).
9. Remove the vacuum assembly (2) and bolts (1).
10. Remove the vacuum assembly gasket (3) and discard.
11. Remove the camshaft cover assembly (2).
12. Remove and discard the camshaft cover gasket (4).

Camshaft Cover Removal (LTG)

1. Remove the PCV hose bolt (2) from the camshaft cover.
2. Disconect the PCV tube assembly (1) at the quick-connect fittings.
3. Remove the engine coolant air bleed pipe bolt (1).
4. Remove the engine coolant air bleed pipe (2), hose (3), and O-ring (4). Inspect O-ring and discard if necessary.
5. Remove the oil level indicator (1). Inspect and replace the oil indicator O-ring seals (4), if necessary.
6. Remove the camshaft cover heat shield (2) and bolts (3).
7. Remove the rear lift bracket (1) and bolts (2).
8. Remove the front lift bracket (2) and bolts (1).
9. Remove the ignition coils (2) and bolts (1).
10. Remove the camshaft position actuator control solenoid valves (2) and bolts (1).
11. Remove the vacuum assembly (2) and bolts (1).
12. Remove the vacuum assembly gasket (3) and discard.
13. Remove the camshaft cover assembly (2).
14. Remove and discard the camshaft cover gasket (4).

Engine Front Cover Removal

1. Remove the accessory drive belt tensioner bolt (1).
2. Remove the accessory drive belt tensioner (2).
3. Remove the engine front cover bolts (2-6, 8).
4. Remove the engine front cover (1).
5. Remove the front oil seal (7) with an appropriate tool.

Camshaft Timing Chain and Tensioner Removal

Special Tools

EN 50837 Timing Chain Tensioner Retraction Tool

For equivalent regional tools, refer to Special Tools .

1. Remove the upper timing chain guide bolts (2, 3).
2. Remove the upper timing chain guide (1).
3. Remove the timing chain tensioner bolts (1) and timing chain tensioner (2).
4. Compress and lock the tensioner using EN-50837 retention tool. Insert EN-50837 retention tool into the lever arm and push in a counterclockwise direction. Compress the tensioner while holding lever arm. Relax the force on the lever and tensioner slightly, allowing the tensioner to extend 3 ratchet clicks, and then hold in place. Pull lever clockwise using EN-50837 retention tool until the hole in the lever aligns with the hole in the tensioner assembly. Push the point of EN-50837 retention tool through the lever and into the tensioner assembly.
5. Remove the timing chain tensioner pivot arm bolt (1).
6. Remove the timing chain tensioner pivot arm (2).
7. Remove the timing chain guide bolts (1).
8. Remove the timing chain guide (2).
9. Remove the timing chain (1).
10. Remove the timing chain oil nozzle (1).

Oil Pan Removal (LCV)

1. Remove the lower oil pan bolts (3) and two oil pan to lower crankcase bolts (2).
2. Remove the lower oil pan (1).
3. Remove the oil pump flow control valve cover (3) and bolts (1, 2, 4).
4. Remove the oil filter adapter (1).
5. Remove the upper oil pan (2) and bolts (1, 3).

Oil Pan Removal (LTG)

1. Remove the lower oil pan bolts (1).
2. Remove the lower oil pan (2).
3. Remove the engine oil cooler (1) and bolts (2).
4. Remove the upper oil pan bolts (2-5).
5. Remove the upper oil pan (1).

Balancer Chain, Sprocket, and Tensioner Removal

Special Tools

EN-50837 Timing Chain Tensioner Retraction Tool

1. Remove the balancer chain tensioner bolt (1).
2. Remove the balancer chain tensioner (2).
3. Compress and lock the tensioner using EN-50837 retention tool. Insert EN-50837 retention tool into the lever arm and push in a counterclockwise direction. Compress the tensioner while holding lever arm. Relax the force on the lever and tensioner slightly, allowing the tensioner to extend 3 ratchet clicks, and then hold in place. Pull lever clockwise using EN-50837 retention tool until the hole in the lever aligns with the hole in the tensioner assembly. Push the point of EN-50837 retention tool through the lever and into the tensioner assembly.
4. Remove the balancer chain guide bolt (1).
5. Remove the balancer chain guide (2).
6. Use an 18 mm open end wrench over flat on balance shaft while loosening balancer shaft sprocket bolt. Remove and discard the balancer shaft driven sprocket bolt (1).
7. Remove the crankshaft key (1).
8. Remove the crankshaft sprocket, balancer shaft driven sprocket, and balancer chain (2) simultaneously.

Intake Camshaft and Components Removal

1. Remove the camshaft front bearing cap bolts (2).
2. Using suitable pry tools, remove the camshaft front bearing cap (1)
3. Mark the intake camshaft rear cap to ensure it is installed in the same position. Remove the intake camshaft bearing rear cap bolts (1) and cap (4).
4. Mark the camshaft caps (2) to ensure they are installed in the same position.
5. Remove the intake camshaft cap bolts (1).
6. Remove the camshaft caps (2).
7. Remove the intake camshaft (3).
8. Remove the intake camshaft roller finger followers (1).
9. Remove the hydraulic lash adjusters (1).

Exhaust Camshaft and Components Removal

1. Mark camshaft caps (2) to ensure they are installed in the same position.
2. Remove the exhaust camshaft cap bolts (3).
3. Remove the camshaft caps (2) ensuring they are marked and refitted in same position on assembly.
4. Remove the exhaust camshaft (1).
5. Remove the exhaust camshaft roller finger followers (1).
6. Remove the hydraulic lash adjusters (1).
7. Remove the camshaft bearing lower front cap (1).

Water Pump Removal (LCV)

1. Remove the thermal bypass pipe (2), bolts (1), and gasket (3) from the water pump assembly. Discard the gasket. Disconnect the pipe from the water outlet assembly.
2. Remove the retaining clip (5) and engine coolant temperature sensor (2).
3. Remove the water outlet assembly (1), bolts (4), and gasket seal (3). Discard the gasket.
4. Remove the thermostat assembly (2), bolts (3), and gasket seal (4). Discard the gasket.
5. Remove the water pump assembly (5), bolts (1), and seal (6). Discard the seal.

Water Pump Removal (LTG)

1. Disconnect the thermal bypass hose at the engine oil cooler.
2. Remove the thermal bypass pipe bolts (1) at the water pump assembly.
3. Disconnect the pipe from the water outlet assembly.
4. Remove the thermal bypass pipe (2) and gasket (3) from the water pump assembly. Discard the gasket.
5. Remove the retaining clip (5) and engine coolant temperature sensor (2).
6. Remove the water outlet assembly (1), bolts (4), and gasket seal (3). Discard the gasket.
7. Remove the thermostat assembly (2), bolts (3), and gasket seal (4). Discard the gasket.
8. Remove the water pump assembly (5), bolts (1), and seal (6). Discard the seal.

Cylinder Head Removal

Special Tools

EN 38188 Cylinder Head Broken Bolt Extractor Kit

For equivalent regional tools, refer to Special Tools .

1. Remove and discard the cylinder head bolts (1).
2. Remove the cylinder head (2).
3. Remove the cylinder head gasket (3).
4. Inspect the cylinder head locating pins. Remove the locating pins and discard, if necessary.
5. Clean all of the gasket surfaces.
6. Use the following procedures when cleaning the cylinder head and cylinder block surfaces: Use a razor blade gasket scraper to clean the cylinder head and cylinder block gasket surfaces. Do not scratch or gouge any surface. NOTE: Do not use any other method or technique to clean these gasket surfaces. Use a new razor blade for each cylinder head and cylinder block. NOTE: Be careful not to gouge or scratch the gasket surfaces. Do not gouge or scrape the combustion chamber surfaces. The feel of the gasket surface is important, not the appearance. There will be indentations from the gasket left in the cylinder head after all of the gasket material is removed. These small indentations will be filled in by the new gasket. Hold the razor blade as parallel to the gasket surface as possible.
7. Clean the old sealer/lube and dirt from the bolt holes.
8. Clean the bolt holes with a nylon bristle brush.
9. When cleaning the cylinder head bolt holes use a suitable commercial spray liquid solvent and compressed air from an extended-tip blow gun to reach the bottom of the holes.
10. Remove any broken long cylinder head bolts using the EN 38188 kit.

Balancer Shaft with Oil Pump Removal

1. Remove the balancer and oil pump shaft assembly bolts (1).
2. Remove the balancer and oil pump shaft assembly (2).

Piston, Connecting Rod, and Bearing Removal

1. Rotate the crankshaft to a position where the connecting rod bolts are the most accessible.
2. Mark the connecting rod and cap with the cylinder position. Also mark their orientation. This will ensure the caps and connecting rods are re-assembled properly.
3. Remove any ridge at the top of the cylinder bore to avoid damage to the piston ring lands.
4. Remove and discard the connecting rod bolts (2).
5. Remove the connecting rod cap (1).
6. Remove the piston and connecting rod assembly (1).

Lower Crankcase Removal

1. Remove the oil pump flow control valve (2) and bolts (1, 3).
2. Remove the oil gallery plugs (1, 2).
3. Remove the lower crankcase perimeter bolts (3).
4. Remove and discard the crankshaft bearing bolts (1).
5. Gently separate the lower crankcase (2) from the block.

Crankshaft and Bearing Removal

1. Remove the crankshaft (1) from the block.
2. Remove the crankshaft rear oil seal (2) from the block and discard.
3. Remove the crankshaft upper bearings (1) and the crankshaft upper thrust bearing (2) from the block.
4. Remove the crankshaft lower bearings (2) from the lower crankcase (1).
5. Clean the oil, sludge, and carbon.
6. Inspect the oil passages for obstructions.
7. Inspect the threads.
8. Inspect the bearing journals and the thrust surfaces for the following conditions: Cracks Chips Gouges Roughness Grooves Overheating (discoloration)
9. Inspect the corresponding bearing inserts for imbedded foreign material. If foreign material exists find the cause and repair it.
10. Measure the crankshaft journals. Use a micrometer or dial indicator to measure the taper and runout. Note the result for the later selection of bearing inserts. If not within limits the crankshaft must be replaced. Note the location of the main bearing high spots. If they are not in line, the crankshaft is bent and must be replaced.

Engine Block Disassemble

1. Remove the engine oil gallery plugs (1, 2) from the rear of the block.
2. Remove the engine oil gallery plugs (2, 3, 4) from the left side and front of the block.
3. Use a suitable hook tool to catch the clip feature and gently remove the engine block coolant baffle (1).
4. Remove the engine coolant heater (1), if equipped. Remove the engine coolant heater hole plug (2) if the heater is not present.
5. Remove the engine oil pressure sensor (1).
6. Remove the knock sensors (1, 4) and bolts (2, 3).
7. Remove the crankshaft position (CKP) sensor (2) and bolt (1).
8. Loosen the piston oil nozzle assembly bolt (1) and remove the piston oil nozzle assembly (2).

Engine Block Cleaning and Inspection

Special Tools

1. EN-8087 Cylinder Bore Gauge
2. GE-7872 Magnetic Base Dial Indicator

For equivalent regional tools, refer to Special Tools .

1. Clean the sealing material from the engine block (1) and lower crankcase (2) gasket mating surfaces with a suitable tool.
2. Clean the engine block and lower crankcase in a cleaning tank with solvent appropriate for aluminum.
3. Flush the engine block with clean water or steam.
4. Clean the oil passages.
5. Clean the blind holes.
6. Inspect the cylinder bores for glazing. If the bore is glazed but otherwise serviceable, refer to Deglazing Procedure in «Cylinder Boring and Honing»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle) .
7. Spray the cylinder bores and the machined surfaces with engine oil.
8. Inspect the threaded holes. Clean the threaded holes with a rifle brush. If necessary, drill out the holes and install thread inserts. Refer to «Thread Repair»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle__thread-repair) .
9. Use a straight edge (1) and a feeler gauge (2) to check the deck surface for flatness. Carefully machine minor irregularities. Replace the block if more than 0.254 mm (0.010 in) must be removed.
10. Inspect the oil pan rail for nicks. Inspect the front cover attaching area for nicks. Use a flat mill file to remove any nicks.
11. Inspect the mating surfaces of the transmission face.
12. Use the following procedure in order to measure the engine block flange runout at the mounting bolt hole bosses: Temporarily install the crankshaft and upper bearings. Measure the crankshaft flange runout using the GE-7872 dial indicator (1) Hold the gauge plate flat against the crankshaft flange. Place the dial indicator stem on the transmission mounting bolt hole boss. Set the indicator to 0. Record the readings obtained from all of the bolt hole bosses. The measurements should not vary more than 0.203 mm (0.008 in). Recheck the crankshaft flange runout if the readings vary more than 0.203 mm (0.008 in). Remove the crankshaft and bearings.
13. Install the bed plate and bolts. Tighten the bed plate bolts to specification.
14. Inspect the crankshaft main bearing bores. Use the EN-8087 gauge (1) to measure the bearing bore concentricity and alignment. Refer to «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) .
15. Replace the engine block and bed plate if the crankshaft bearing bores are out of specification.
16. Remove the bed plate.

Measuring Cylinder Bore Diameter

1. Measure the cylinder bore diameter 35 mm (1.378 in) from the deck face using the EN-8087 gauge.
2. Compare your results with the «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) , . If the cylinder diameter exceeds the specifications, the cylinder block may be oversized to 0.25 mm (0.010 in). There is only one size of oversized pistons and rings available for service. Refer to «Cylinder Boring and Honing»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle) .

Measuring Cylinder Bore Taper

1. Measure the cylinder bore along the thrust surfaces, perpendicular to the crankshaft centerline, at 10 mm (0.394 in) below the deck surface (1) and record your measurement.
2. Measure the cylinder bore along the thrust surfaces, perpendicular to the crankshaft centerline, at 125 mm (4.921 in) below the deck surface (2) and record your measurement.
3. Calculate the difference between the 2 measurements. The result will be the cylinder taper.
4. Compare your results with the «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) , . If the cylinders exceed the specifications, the cylinder block may be oversized to 0.25 mm (0.010 in). There is only one size of oversized pistons and rings available for service. Refer to «Cylinder Boring and Honing»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle) .

Measuring Cylinder Bore Out-of-Round

1. Measure both the thrust and non-thrust cylinder diameter at 10 mm (0.394 in) below the deck surface (1). Record your measurements.
2. Calculate the difference between the 2 measurements. The result will indicate out-of-round at the upper end of the cylinder.
3. Measure both the thrust and non-thrust cylinder diameter at 125 mm (4.921 in) below the deck surface (2). Record your measurements.
4. Calculate the difference between the 2 measurements. The result will indicate out-of-round at the lower end of the cylinder.
5. Compare your results with the «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) , . If the cylinders exceed these specifications, the cylinder block may be oversized to 0.25 mm (0.010 in). There is only one size of oversized pistons and rings available for service. Refer to «Cylinder Boring and Honing»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle) .

Boring Procedure

1. Measure all pistons with a micrometer to determine the cylinder bore diameter. Refer to «Engine Block Cleaning and Inspection»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle__engine-block-cleaning-and-inspection) .
2. Before you use any type of boring bar, use a fine file and clean the top of the cylinder block, removing any dirt or burrs. If you do not check the cylinder block to ensure that the deckface is clean, flat, and debris free, the boring bar may be improperly positioned or tilted and the cylinder bore could be bored at an incorrect angle.
3. Carefully follow the instructions furnished by the manufacturer regarding use of the equipment.
4. When you bore the cylinders, ensure the bedplate is installed. Tighten the ten bedplate assembly bolts to the proper torque in order to avoid distortion of the cylinder bores during final assembly.
5. When you take the final cut with a boring bar, leave 0.075 mm (0.003 in) on the cylinder bore diameter for the finish honing and fit of the piston.

Honing Procedure

1. When honing the cylinders, follow the manufacturer's recommendations for equipment use, cleaning, and lubrication. Use only clean, sharp stones of the proper grade for the amount of material you remove. Dull, dirty stones cut unevenly and generate excessive heat. Do not hone to final clearance with a coarse or medium-grade stone. Leave sufficient metal so that all stone marks may be removed with fine-grade stones. Perform final honing with a fine-grade stone, honing the cylinder to the proper clearance.
2. During the honing operation, thoroughly clean the cylinder bore. Repeatedly check the cylinder bore for fit with the selected piston.
3. When honing a cylinder for fit to an oversize piston, first perform the preliminary honing with a 100-grit stone.
4. Perform final cylinder honing with a 240-grit stone and obtain a 45 degree cross hatch pattern.
5. The finish marks should be clean but not sharp. The finish marks should also be free from imbedded particles and torn or folded metal.
6. By measuring the selected piston at the sizing point and by adding the average of the clearance specification, you can determine the final cylinder honing dimension required.
7. After final honing and before the piston is checked for fit, clean the cylinder bores with hot water and detergent. Scrub the bores with a stiff bristle brush and rinse the bores thoroughly with hot water. Do not allow any abrasive material to remain in the cylinder bores. This abrasive material may cause premature wear of the new piston rings and the cylinder bores. Abrasive material will also contaminate the engine oil and may cause premature wear of the bearings. After washing the cylinder bore, dry the bore with a clean rag.
8. Perform final measurements of the piston and the cylinder bore.
9. Permanently mark the top of the piston for the specific cylinder to which it has been fitted.
10. Apply clean engine oil to each cylinder bore in order to prevent rusting.

Deglazing Procedure

1. If the bore is glazed but otherwise serviceable, lightly break the glaze with a hone. Replace the piston rings. Refer to «Piston, Connecting Rod, and Bearing Installation»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle__piston-connecting-rod-and-bearing-installation) .
2. Using a ball type or self centering honing tool, deglaze the cylinder bore lightly. Deglazing should be done only to remove any deposits that may have formed. Use a 240-grit stone of silicone carbide, or equivalent, material when preforming the deglazing procedure. The honing stones must be clean, sharp, and straight. Move the hone slowly up and down to produce a 45 degree cross-hatch pattern. Clean the bore thoroughly with soap and water. Dry the bore. Rub clean engine oil in the bore. Re-measure the bore.
3. If the cylinder bore is out of specification, the cylinder bore may be oversized to 0.25 mm (0.010 in). There is only one size of oversized pistons and rings available for service.
4. If honing is not required, clean the cylinder bores with hot water and detergent. Apply clean engine oil to the bore after washing and drying the bore.

Crankshaft Balancer Cleaning and Inspection

1. Clean the crankshaft balancer (2).
2. Clean the belt grooves of all dirt or debris with a wire brush.
3. Dry the crankshaft balancer with compressed air.
4. Inspect the crankshaft balancer for the following: Worn, grooved, or damaged hub seal surface. A crankshaft balancer hub seal surface with excessive scoring, grooves, rust or other damage must be replaced. NOTE: In order for the belt to track properly, the belt grooves should be free of all dirt or debris. Dirty or damaged belt grooves The balancer belt grooves should be free of any nicks, gouges, or other damage that may not allow the belt to track properly. Minor imperfections may be removed with a fine file. Worn, chunking or deteriorated rubber between the hub and pulley.

Engine Flywheel Cleaning and Inspection

1. Clean the flywheel (2) in solvent.
2. Dry the flywheel with compressed air.
3. Inspect the flywheel for the following: Damaged ring gear teeth. Stress cracks around the flywheel-to-crankshaft bolt hole locations. Weight saving holes.

Automatic Transmission Flex Plate Cleaning and Inspection

1. Clean the flywheel (2) in solvent.
2. Dry the flywheel with compressed air.
3. Inspect the flywheel for the following: Damaged ring gear teeth. Stress cracks around the flywheel-to-crankshaft bolt hole locations. Weight saving holes.

Crankshaft and Bearing Cleaning and Inspection

Special Tools

GE-7872 Magnetic Base Dial Indicator Set

For equivalent regional tools, refer to Special Tools .

1. Clean the crankshaft (1) with solvent.
2. Thoroughly clean all oil passages and inspect for restrictions or burrs.
3. Dry the crankshaft with compressed air.
4. Perform a visual inspection of the crankshaft for damage.
5. Inspect the crankshaft reluctor ring. Replace the crankshaft assembly if damage to the reluctor ring is present.
6. Inspect the crankshaft journals for wear. The journals should be smooth, with no signs of scoring, wear, or damage.
7. Inspect the crankshaft journals for grooves or scoring.
8. Inspect the crankshaft journals for scratches or wear.
9. Inspect the crankshaft journals for pitting or imbedded bearing material.
10. Measure the crankshaft journals for out-of-round.
11. Measure the crankshaft journals for taper.
12. Measure the crankshaft runout. Using wooden V-blocks, support the crankshaft on the front and rear journals.
13. Use the GE-7872 indicator (1) in order to measure the crankshaft runout at the front and rear intermediate journals.
14. Use the GE-7872 indicator in order to measure the runout of the crankshaft rear flange.
15. Replace the crankshaft if the measurements are not within specifications.
16. Inspect crankshaft bearings for craters or pockets (1). Flattened sections on the bearing halves also indicate fatigue.
17. Inspect the crankshaft bearings for excessive scoring or discoloration (2).
18. Inspect the crankshaft bearings for dirt or debris imbedded into the bearing material.
19. Inspect the crankshaft bearings for improper seating indicated by bright, polished sections of the bearing (3). If the lower half of the bearing is worn or damaged, both upper and lower halves should be replaced. Generally, if the lower half is suitable for use, the upper half should also be suitable for use.

Piston and Connecting Rod Disassemble

Special Tools

1. EN-46745 Piston Pin Clip Remover/Installer
2. EN-46745-4 Piston Pin Clip Remover/Installer Adapter

For equivalent regional tools, refer to Special Tools .

1. Disassemble the piston rings (1, 2, 3, 4, 5). Use a suitable tool to expand the rings. The piston rings must not be reused.
2. Remove the piston pin retainers using the EN-46745 remover (1) and EN-46745-4 adapter.
3. Remove the piston pin (1) and the connecting rod (3) from the piston (2).

Connecting Rod Measurement

1. Clean the connecting rods (1) in solvent and dry with compressed air.
2. Inspect the connecting rods for the following: Signs of being twisted, bent, nicked, or cracked Scratches or abrasion on the rod bearing seating surface
3. If the connecting rod bores contain minor scratches or abrasions, clean the bores in a circular direction with a light emery paper. DO NOT scrape the rod or rod cap.
4. If the beam of the rod is scratched or has other damage replace the connecting rod.
5. Measure the piston pin to connecting rod bore using the following procedure: Using an outside micrometer, take two measurements of the piston pin in the area of the connecting rod contact. Using an inside micrometer, measure the connecting rod piston pin bore. Subtract the piston pin diameter from the piston pin bore diameter. The clearance should not be more than 0.021 mm (0.0008 in).
6. If there is excessive clearance, replace the piston pin.
7. If there is still excessive clearance, replace the connecting rod.

Piston Measurement

1. Clean the piston skirts and the pins with a cleaning solvent. DO NOT wire brush any part of the piston.
2. Clean the piston ring grooves with a groove cleaner. Make sure oil ring holes and slots are clean.
3. Inspect the pistons for the following conditions: Cracked ring lands, skirts, or pin bosses Ring grooves for nicks, burrs that may cause binding Warped or worn ring lands Eroded areas at the top of the piston (1) Scuffed or damaged skirts (2) Worn piston pin bores (3)
4. Replace pistons that show any signs or damage or excessive wear.
5. Measure the piston pin bore to piston pin clearances using the following procedure: Piston pin bores and pins must be free of varnish or scuffing. Use an outside micrometer to measure the piston pin in the piston contact areas. Using an inside micrometer, measure the piston pin bore. Subtract the measurement of the piston pin bore from the piston pin. The clearance should be within 0.002-0.012 mm (0.00007-0.00047 in). If the clearance is excessive, determine which component is out of specification.
6. Measure the piston ring end gap using the following procedure: Place the piston ring in the area of the bore where the piston ring will travel (approximately 25 mm or 1 inch down from the deck surface). Be sure the ring is square with the cylinder bore by positioning the ring with the piston head. Measure the end gap of the piston ring with feeler gauges (1). Compare the measurements with those provided below: The top compression ring end gap should be 0.20-0.40 mm (0.0060-0.015 in). The second compression ring end gap should be 0.35-0.55 mm (0.0137-0.0216 in). The oil ring end gap should be 0.25-0.76 mm (0.0098-0.029 in). If the clearance exceeds the provided specifications, the piston rings must be replaced. Repeat the procedure for all the piston rings.
7. Measure the piston ring side clearance using the following procedure: Roll the piston ring entirely around the piston ring groove. If any binding is caused by a distorted piston ring, replace the ring. With the piston ring on the piston, use feeler gauges (1) to check clearance at multiple locations. The clearance between the surface of the top piston ring and the ring land should be no greater than 0.075 mm (0.0030 in). If the clearance is greater than specifications, replace the piston ring. If the new ring does not reduce the top ring side clearance to 0.075 mm (0.0030 in) or less, install a new piston.
8. The top compression ring may be installed with either side up. There is a locating dimple on the 2nd compression ring near the end for identification of the top side. Install the 2nd compression ring with the dimple facing up.
9. The clearance between the surface of the second piston ring and the ring land should be no greater than 0.069 mm (0.0026 in).
10. If the new ring does not reduce the clearance to 0.069 mm (0.0026 in) or less, install a new piston.
11. Measure piston width using the following procedure: Using an outside micrometer (2), measure the width of the piston 14.5 mm (0.570 in) above the bottom of the piston skirt at the thrust surface perpendicular to the centerline of the piston pin. Compare the measurement of the piston to its original cylinder by subtracting the piston width from the cylinder diameter. The proper clearance specification for the piston is 0.010-0.041 mm (0.0004-0.0016 in).
12. If the clearance obtained through measurement is greater than these specifications and the cylinder bores are within specification, replace the piston (1).

Piston Selection

1. Inspect the engine block cylinder bore. Refer to «Engine Block Cleaning and Inspection»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle__engine-block-cleaning-and-inspection) .
2. Inspect the piston and the piston pin.
3. Use a bore gauge (1) and measure the cylinder bore diameter. Measure at a point 64 mm (2.5 in) from the top of the cylinder bore.
4. Measure the bore gauge with a micrometer (1) and record the reading.
5. With a micrometer (2) or caliper at a right angle to the piston (1), measure the piston 14 mm (0.570 in) from the bottom of the skirt.
6. Subtract the piston diameter from the cylinder bore diameter in order to determine piston-to-bore clearance.
7. For proper piston-to-bore clearance. Refer to «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) .
8. If the proper clearance cannot be obtained, select another piston and measure for the clearances.
9. If the proper fit cannot be obtained, hone the cylinder bore or replace the cylinder block.
10. When the piston-to-cylinder bore clearance is within specifications, mark the top of the piston using a permanent marker for installation to the proper cylinder. Refer to «Separating Parts»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-description-and-operation__separating-parts) .

Scheme 83

Camshaft Assembly Disassemble

Piston and Connecting Rod Assemble

Special Tools

1. EN-46745 Piston Pin Clip Remover/Installer
2. EN-46745-4 Piston Pin Clip Remover/Installer Adapter

For equivalent regional tools, refer to Special Tools .

1. The arrow (1), on the top of the piston, must go to the front of the block.
2. The feature at the split line (4), located on one side of the connecting rod, must go to the front of the block.
3. Assemble the connecting rod (3) and the piston (2).
4. Use the following procedure to assemble the piston pin and the retainer: Coat the piston pin with oil. Install one side of one NEW piston pin retainer into the retaining groove using EN-46745 installer and EN-46745-4 adapter. Rotate the retainer until it is fully seated in the groove. Install the connecting rod and the piston pin. Push the piston pin until it bottoms in the previously installed retainer. Install the second NEW piston pin retainer, using EN-46745 installer (1) and EN-46745-4 adapter. Ensure that the piston moves freely.
5. Install the following components of the oil control ring assembly: The piston oil ring rail (5) The piston oil ring rail spacer (4) The second piston oil ring rail (3)
6. Install the piston lower compression ring (2). Place the manufacturer's mark facing up.
7. Install the piston upper compression ring (1).

Camshaft Cleaning and Inspection

1. Inspect the camshaft journals and lobes for wear or scoring.
2. Inspect the camshaft sprocket alignment notch for damage.
3. Wash the camshafts (1, 2) in solvent.
4. Oil the camshafts.

Scheme 84

Camshaft Assembly Assemble

Camshaft Timing Chain, Sprocket, and Tensioner Cleaning and Inspection

1. Inspect the timing chain guides (3, 7) and timing chain tensioner pivot arm (1) for cracking or wear.
2. Replace the timing chain guides if wear exceeds 1.12 mm (0.045 in) depth on the chain guide surface.
3. Inspect the timing chain tensioner (13) shoe for wear.
4. Replace the timing chain tensioner if shoe wear exceeds 1.12 mm (0.045 in) depth on the chain guide surface.
5. Inspect the timing chain (4) and actuators (2, 5) for wear.
6. Inspect the camshaft actuator faces for signs of movement.
7. Inspect the camshaft actuator teeth and chain for signs of excessive wear, chipping, or seizure of the timing chain links.
8. Inspect the timing chain oil nozzle (6) for collapse or cracks at the bolt boss. Discard and replace the oil nozzle body if it is damaged.
9. Verify oil nozzle oil flow with compressed air.
10. Inspect the timing chain tensioner (13) for scoring or free movement.
11. Inspect the timing chain tensioner washer. If damaged, replace the timing chain tensioner.
12. Inspect the crankshaft sprocket (12) for excessive wear or chipping.
13. Inspect the balancer chain (8) for wear.
14. Inspect the balancer chain guide (11) for wear.
15. Inspect the balancer chain tensioner (9) for wear.
16. Inspect the balancer shaft driven sprocket (10) for wear or chipping.

Cylinder Head Disassemble

Special Tools

1. EN-43963 Valve Spring Compressor (off car)
2. EN-46116 Valve Stem Seal Remover/Installer
3. EN-50717 Valve Spring Compressor

For equivalent regional tools, refer to Special Tools .

1. Remove the intake camshaft position sensor (2) and bolt (1).
2. Remove the exhaust camshaft position sensor (2) and bolt (1).
3. Perform the following procedure to remove the valve keys, springs, and retainers: Using the EN-50717 fixture and the EN-43963 compressor adapter , compress the valve spring. Remove the valve keys (1). Slowly release the compression from the valve spring assembly. Remove the retainer (2).
4. Remove the springs (1).
5. Using EN-46116 remover , remove the valve seals (1). Discard the seals, do not reuse.
6. Remove the valves (1, 2).
7. Remove the cylinder head plug (1).
8. Remove the cylinder head plugs (1, 2).
9. Remove the cylinder head plugs (1).
10. Remove the cylinder head oil gallery restrictors (1).

Cylinder Head Cleaning and Inspection

Special Tools

1. EN 22738-B Valve Spring Tester
2. EN-28410 Gasket Remover
3. EN-39358 Spark Plug Socket
4. GE 7872 Magnetic Base Dial Indicator

For equivalent regional tools, refer to Special Tools .

Valve Cleaning and Inspection

1. Clean the valves of carbon, oil and varnish. Use a soft bristle wire brush to clean any carbon build-up from the valve head. Varnish can be removed by soaking in Parts Immersion Solvent. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
2. Clean the valve guides.
3. Inspect the valve stem for pitting or wear (4).
4. Inspect the valve key groove for chipping or wear (5). Replace the valve if chipped or worn.
5. Inspect the valve face for burning or cracking (1). If pieces are broken off, inspect the corresponding piston and cylinder head area for damage.
6. Inspect the valve stem for burrs and scratches. Burrs and minor scratches may be removed with an oil stone.
7. Inspect the valve stem for straightness (3) and the valve head for bending or distortion using V blocks. Bent or distorted valves must be replaced.
8. Clean the deposits from the valve face. Inspect the valve face for grooving.
9. Replace the valve if the face is grooved. Valve faces cannot be machined. If worn, or damaged, the valves must be replaced.
10. Replace the valve if the valve head O.D. and chamfer (2) is worn or out of specification. Refer to «Valve and Seat Grinding»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle) .
11. The valves may be lightly lapped to the valve seats.
12. Replace the valve if the valve tip (6) is worn.
13. If no apparent wear, pitting, grooving, or distortion is present, perform the valve measurement and reconditioning procedure to verify valve specification. Refer to «Valve and Seat Grinding»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle) .

Valve Guide Measurement

1. Measure the valve stem (1)-to-guide (2) clearance. Excessive valve stem-to-guide clearance may cause an excessive oil consumption and may also cause a valve to break. Insufficient clearance will result in noisy and sticky functioning of the valve and will disturb the engine assembly smoothness.
2. Clamp the GE 7872 dial indicator to the cylinder head at the camshaft cover rail.
3. Locate the dial indicator so that the movement of the valve stem from side to side, crossways to the cylinder head, will cause a direct movement of the indicator stem. The dial indicator stem must contact the side of the valve stem just above the valve guide.
4. Drop the valve head about 0.064 mm (0.0025 in) off the valve seat.
5. Use light pressure when moving the valve stem from side to side in order to obtain a clearance reading. Refer to «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) for proper clearance.
6. If the clearance for the valve is greater than specifications and a new standard diameter valve stem will not bring the clearance within specifications, replace the cylinder head.

Valve Spring Cleaning and Inspection

1. Clean the valve springs in solvent.
2. Dry the valve springs with compressed air.
3. Inspect the valve springs for broken coils or coil ends.
4. Measure the valve spring tension using the EN 22738-B tester. Refer to «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg)
5. If low valve spring load is found, replace the valve springs. DO NOT use shims to increase spring load. The use of shims can cause the valve spring to bottom out before the camshaft lobe is at peak lift.

Valve Rocker Arm Cleaning and Inspection

1. Inspect the camshaft follower roller (1) for the following: Flat spots Excessive scoring and pitting Ensure the roller spins freely
2. Inspect the camshaft follower valve tip area (2).
3. Inspect the camshaft follower stationary hydraulic lash adjuster (SHLA) pivot area (3).
4. Replace the camshaft follower or followers as necessary.

Cylinder Head and Gasket Surface Cleaning and Inspection

1. Remove the spark plugs (1) using EN-39358 socket.
2. Inspect the cylinder head gasket and mating surfaces for leaks, corrosion and blow-by. If the gasket has failed, use the following faults to determine the cause: Improper installation Loose or warped cylinder head Missing, off location or not fully seated dowel pins Corrosion in the seal area around the coolant passages Chips or debris in the cylinder head bolt holes Bolt holes in the cylinder block not drilled or tapped deep enough
3. Inspect the cylinder head gasket surface. Cylinder head may be reused if corrosion is found only outside a 4 mm (0.375 in) band around each combustion chamber (1). Replace the cylinder head if the area between the valve seats is cracked (2). Replace the cylinder head if corrosion has been found inside a 4 mm (0.375 in) band around each combustion chamber (3).
4. Remove the sealant from the rear cap mating surface with EN-28410 remover. Care must be used to avoid gouging or scraping the sealing surfaces.
5. Clean the cylinder head. Remove all varnish, soot and carbon to the bare metal.
6. Clean the valve guides.
7. Clean the threaded holes. Use a nylon bristle brush.
8. Clean the remains of the sealer from the plug holes.
9. Inspect the cylinder head for cracks. Check between the valve seats and in the exhaust ports.
10. Inspect the cylinder head deck for corrosion, sand inclusions and blow holes.
11. Using a straight edge (1) and feeler gauge (2), inspect the cylinder head deck surface for flatness. Refer to «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) . If the cylinder head is out of specification, replace the cylinder head. Do not machine the cylinder head.
12. Inspect all the threaded holes for damage. Threads may be reconditioned with thread inserts.
13. Inspect the sealing surfaces.
14. Inspect the cylinder head plugs (1, 2) and verify the oil orifice is clear and free of debris.
15. Inspect the intake camshaft bearing rear cap (2) for damage.
16. Inspect the camshaft bearing caps (1) for damage.
17. Inspect the camshaft front upper and lower bearing caps (3, 4) for damage.
18. Install the spark plugs (1) using EN-39358 socket. Tighten the plugs to 20 N.m (15 lb ft).

Valve Measurement and Reconditioning Overview

1. Proper valve service is critical to engine performance. Therefore, all detailed measurement procedures must be followed to identify components that are out of specification.
2. If the measurement procedures reveal that the valve or valve seat must be reconditioned, it is critical to perform the measurement procedures after reconditioning.

Valve Seat Width Measurement Procedure

1. Measure the valve seat width in the cylinder head using a proper scale.
2. Measure the seat width (b) on the valve face (1) using a proper scale.
3. Compare your measurements with the specifications listed in «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) .
4. If the seat widths are acceptable, check the valve seat roundness using the Valve Seat Roundness Measurement Procedure.
5. If the seat width is not acceptable, you must grind the valve seat using the Valve and Seat Reconditioning Procedure to bring the width back into specification. Proper valve seat width is critical to providing the correct amount of valve heat dissipation.

Valve Seat Roundness Measurement Procedure

1. Measure the valve seat roundness using a dial indicator attached to a tapered pilot installed in the guide. The pilot should have a slight bind when installed in the guide.
2. Compare your measurements with the specifications listed in «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) .
3. If the valve seat exceeds the roundness specification, you must grind the valve and valve seat using the Valve and Seat Reconditioning Procedure.
4. If new valves are being used, the valve seat roundness must be within 0.05 mm (0.002 in).

Valve Head O.D. and Chamfer Measurement Procedure

1. Measure the valve head O.D. and chamfer (a) using an appropriate scale. Refer to «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) .
2. If the valve head O.D. and chamfer is within specification, test the valve (1) for seat concentricity using the Valve-to-Seat Concentricity Measurement Procedure. Reinspect the valve head O.D. and chamfer after completing the concentricity measurement if valve seat reconditioning is performed.

Valve-to-Seat Concentricity Measurement Procedure

1. Coat the valve face (3) lightly with blue dye (1).
2. Install the valve in the cylinder head.
3. Turn the valve against the seat with enough pressure to wear off the dye.
4. Remove the valve from the cylinder head.
5. Inspect the valve face. If the valve face is concentric, providing a proper seal, with the valve stem, a continuous mark (2) will be made around the entire face. NOTE: The wear mark MUST be at least 0.5 mm (0.020 in) from the outer diameter, the margin (a), of the valve. If the wear mark is too close to the margin, the seat must be reconditioned to move the contact area away from the margin. NOTE: Do not grind or condition the intake valve. If the intake valve is out of specification, replace the valve. If the face is not concentric with the stem, the mark will NOT be continuous around the valve face. The valve should be refaced or replaced and the seat must be reconditioned using the Valve and Seat Reconditioning Procedure.

Valve and Seat Reconditioning Procedure

1. Grind the valve seating surface (a) to the proper angle specification (2) listed in «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) .
2. Grind the valve relief surface to the proper angle specification (1) listed in «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) , to correctly position the valve seating surface (a) to the valve.
3. Grind the valve undercut surface to the proper angle specification (3) listed in «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) , to narrow the valve seating surface width (a) to the specifications listed in «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) .
4. Replace the intake valve if it is out of specification. Refer to «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) .
5. If the original exhaust valve is being used, grind the valve to the specifications listed in «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) . Measure the valve head O.D. and chamfer again after grinding using the Valve Head O.D. and Chamfer Measurement Procedure. Replace the exhaust valve if it is out of specification. New valves do not require grinding.
6. When grinding the valves and seats, grind off as little material as possible. Cutting valve seat results in lowering the valve spring pressure.
7. Install the valve in the cylinder head. If you are using refaced exhaust valves, lap the valves into the seats with a fine grinding compound. The refacing and reseating operations should leave the refinished surfaces smooth and true so that minimal lapping is required. Excessive lapping will groove the valve face and prevent a good seat when hot. Be sure to clean any remaining lapping compound from the valve and seat with solvent and compressed air prior to final assembly.
8. After obtaining the proper valve seat width in the cylinder head, you must re-measure the valve stem height using the Valve Stem Height Measurement Procedure.
9. If the valve stem height is acceptable, test the seats for concentricity using the Valve-to-Seat Concentricity Measurement Procedure.

Valve Stem Height Measurement Procedure

1. Install the valve (1) into the valve guide in the cylinder head (2).
2. Ensure the valve is seated to the cylinder head valve seat.
3. Install the valve stem oil seal.
4. Install the valve spring retainer and valve stem locks.
5. Measure the distance (a) between the valve seal lip to the bottom of the valve spring retainer. Refer to «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) .
6. If the maximum height specification is exceeded, a new valve should be installed and the valve stem height re-measured.
7. If the valve stem height still exceeds the maximum height specification, the cylinder head must be replaced.

Cylinder Head Assemble

Special Tools

1. EN-50717 Valve Spring Compressor
2. EN-9666 Valve Spring Tester
3. EN-43963 Valve Spring Compressor (off car)

For equivalent regional tools, refer to Special Tools .

1. Install the cylinder head oil gallery restrictors (1).
2. Install NEW cylinder head plugs. Coat the plugs with sealer. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
3. Install the water jacket hole plugs (1) in the top of the cylinder head. Tighten the plugs to 50 N.m (37 lb ft).
4. Install the oil gallery plugs (1, 2) in the front of the cylinder head.
5. Install the oil gallery plug (1) in the rear of the cylinder head. Tighten the plug to 40 N.m (30 lb ft).
6. Inspect the valve springs for the following conditions: Expanded height Unparallel spring ends Spring tension using EN-9666 tester Any distorted springs should be replaced
7. Inspect the valves and the valve seats. Refer to «Valve and Seat Grinding»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle) .
8. Lubricate the valves. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
9. Install the valves (1, 2). Replace the valves, if required.
10. Install the NEW valve seals (1). Fully seat the seals on the valve guides.
11. Install the springs (1).
12. Install the retainers and keys using the following procedure: Install the retainer (2). Using the EN-50717 compressor and the EN-43963 adapter , compress the valve spring. Install the valve keys (1). Slowly release the compression from the valve/spring assembly. Inspect for proper valve key seating.
13. Lubricate the camshaft position sensor O-ring with clean engine oil.
14. Install the exhaust camshaft position sensor (2) and bolt (1). Tighten the bolt to 10 N.m (89 lb in).
15. Lubricate the camshaft position sensor O-ring with clean engine oil.
16. Install the intake camshaft position sensor (2) and bolt (1). Tighten the bolt to 10 N.m (89 lb in).

Scheme 85

Balancer Shaft with Oil Pump Disassemble

Scheme 86

Balancer Shaft with Oil Pump Cleaning and Inspection

Scheme 87

Balancer Shaft with Oil Pump Assemble

Scheme 88

Camshaft Cover - Right Side

Scheme 89

Camshaft Cover - Left Side

Scheme 90

Camshaft Cover - PCV Valve Components for Turbocharger Models

Scheme 91

Camshaft Cover - Bottom

Scheme 92

Turbocharger and Components

Scheme 93

Turbocharger Inlet and Wastegate Regulator Solenoid Hoses

Fuel Rail and Injectors Cleaning and Inspection

Special Tools

1. EN-47909 Injector Bore and Sleeve Cleaning Kit
2. EN-49245 Fuel Injector Seal Install/Sizer
3. EN-50791 Fuel Injector Nozzle Installer

For equivalent regional tools, refer to Special Tools .

1. Remove and inspect the fuel rail insulator assemblies (1-4). Replace the entire assembly if any components show signs of wear or the insulators (4) show the following conditions: Dry or cracked appearance Flattened or misshapen appearance
2. Disconnect the electrical connections from the fuel injectors.
3. Use EN-50791 installer (3) to compress the fuel injector (1), and relieve pressure on the retaining pin (2). Remove the fuel injector retaining pin (2). Remove EN-50791 installer once the retaining pin is removed.
4. Remove the injectors (1) from the fuel rail by pulling straight out along the fuel injector axis. Slight rotation of the fuel injector is acceptable as long as excessive force is not applied to the fuel injector tab while engaged in the fuel rail slot (3).
5. Remove the fuel injector holding clamp (2) from the rear of the fuel injector.
6. Remove and discard the fuel injector O-ring (2) and plastic spacer (1).
7. Remove and discard the fuel injector seals (3).
8. Clean the exterior of the fuel rail (1) and injectors in solvent.
9. Using EN-47909 cleaning kit , clean the fuel injector bores and sleeves.
10. Inspect the fuel rail and components for the following conditions: Damage, debris, or restrictions to the fuel rail Damage, debris, or restrictions to the fuel ports in the fuel rail Damage to the mounting area for the fuel rail Damage to the fuel rail mounting bolts Damage to the threads on the fuel rail fuel feed fitting
11. Replace the fuel rail if any damage is found. Do not attempt to repair a fuel rail.
12. Inspect the fuel pressure sensor (3) for damage. Disconnect the harness connector (2) from the fuel pressure sensor. Remove the fuel pressure sensor. Dry the fuel pressure sensor bore in the fuel rail with a lint free cloth. The bore should be free of fuel, debris, and burrs. Lubricate the fuel rail fuel pressure sensor bore with clean engine oil. Lubricate the threads and sealing area on the fuel pressure sensor with clean engine oil. Install the fuel pressure sensor hand tight. Remove the fuel pressure sensor and re-lubricate the bore, threads, and sealing area. Install the fuel pressure sensor and tighten to 33 N.m (25 lb ft). Connect the harness connector to the fuel pressure sensor.
13. Inspect the fuel injectors for the following conditions: Damage to the fuel injector connector (3) Damage to the fuel injector harness connector Damage to the fuel injector tip (5) Damage to the fuel injector (4)
14. Replace the fuel injector if any damage is found. Do not attempt to repair a fuel injector.
15. Install the a new fuel injector spacer (1).
16. Lubricate the new O-ring (2) with clean, silicone-free 5W30 engine oil.
17. Install the O-ring on the injector.
18. Install the fuel injector holding clamp (2) onto the rear of the fuel injector.
19. Hand install fuel injectors (1) to the fuel rail, carefully aligning the fuel injector tab to the slot in the fuel rail (3).
20. Using EN-50791 installer (3), compress the fuel injector (1) into the fuel rail.
21. Ensure the fuel injector is fully seated in the fuel rail, and install the fuel injector retaining pin (4).
22. Ensure the fuel injector retaining pin is fully seated in the fuel rail. Remove EN-50791 installer. Repeat process until all fuel injectors are properly installed to the fuel rail.
23. Connect the electrical connection to the fuel rail.
24. Connect the fuel rail harness connectors (1) to the fuel injectors.
25. Install EN-49245 protector (2) onto the fuel injector tip. Place a NEW seal (1) on EN-49245 protector.
26. Install a seal into the second recessed area (3) of the fuel injector.
27. Compress the seal with your fingers, then resize the seal using the EN-49245 sizer (4).
28. Place a second NEW seal (1) on EN-49245 protector.
29. Install the seal into the first recessed area of the fuel injector.
30. Compress the seal with your fingers, then resize the seal using the EN-49245 sizer (4).

Intake Manifold Cleaning and Inspection

1. Clean the intake manifold (1) mating surfaces.
2. Inspect the intake manifold for damage.
3. Inspect the intake manifold for cracks near metallic inserts.
4. Inspect the crankcase ventilation passages (1) in the intake manifold face for blockage.
5. Clean the crankcase ventilation passages with compressed air if necessary. Use a maximum of 172 kPa (25 psi) of air pressure.
6. Replace the intake manifold as necessary.

Exhaust Manifold Cleaning and Inspection

1. Remove the oxygen sensor (2) from the manifold.
2. Clean the exhaust manifold (1) in solvent.
3. Dry the exhaust manifold with compressed air.
4. Inspect the exhaust manifold (1) for damage.
5. Inspect the heat shield (3) for damage.
6. Use a straight edge and a feeler gauge and measure the exhaust manifold mounting face (1) for warpage. An exhaust manifold face with warpage in excess of 0.25 mm (0.0100 in) may cause an exhaust leak and may effect OBD II system performance. Exhaust manifolds not within specifications must be replaced.

Scheme 94

Oil Pan Cleaning and Inspection

Thread Repair

Special Tools

1. EN 42385-700 High Feature Thread Repair Kit
2. EN 42385-850 Thread Repair Kit
3. EN 42385-880 Head Bolt Thread Repair Adapter Kit

For equivalent regional tools, refer to Special Tools .

Scheme 95

The thread repair process involves a solid, thin walled, self-locking, carbon steel, bushing type insert (1). During the bushing installation process, the driver tool expands the bottom external threads of the insert into the base material (2). This action mechanically locks the insert in place. Also, when installed to the proper depth, the flange of the insert will be seated against the counterbore of the repaired hole.

1. Drill out the threads of the damaged hole (1). M6 inserts require a minimum drill depth of 15 mm (0.59 in). M8 inserts require a minimum drill depth of 20 mm (0.79 in). M10 inserts require a minimum drill depth of 23.5 mm (0.93 in).
2. Using compressed air, clean out any chips.
3. Counterbore the hole to the full depth permitted by the tool (1).
4. Using compressed air, clean out any chips.
5. Using a tap wrench (2), tap the threads of the drilled hole. M6 inserts require a minimum tap depth of 15 mm (0.59 in). M8 inserts require a minimum tap depth of 20 mm (0.79 in). M10 inserts require a minimum tap depth of 23.5 mm (0.93 in).
6. Using compressed air, clean out any chips.
7. Spray cleaner into the hole. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
8. Using compressed air, clean any cutting oil and chips out of the hole.
9. Lubricate the threads of the installer tool (2) with the driver oil (1).
10. Install the insert (2) onto the driver tool (1).
11. Apply threadlock LOCTITE™ 277, EN 42385-109 (1) loctite , or equivalent to the insert OD threads (2).
12. Install the insert (2) into the hole. Install the insert until the flange of the insert contacts the counterbored surface. Continue to rotate the installer tool (1) through the insert. The installer tool will tighten up before screwing completely through the insert. This is acceptable. You are forming the bottom threads of the insert and mechanically locking the insert to the base material threads.
13. Inspect the insert for proper installation into the hole. A properly installed insert (1) will be either flush or slightly below flush with the surface of the base material (2).

Cylinder Head Bolt Hole Thread Repair

1. The cylinder head bolt hole thread repair kit consists of the following items: Drill (1) Tap (2) Installer (3) Sleeve (4) Alignment Pin (5) Bushing (6) Bolts (7) Fixture Plate (8)
2. Install the fixture plate (3), bolts (1), and bushing (2) onto the engine block deck. Position the fixture plate and bushing over the hole that is to be repaired (4).
3. Position the alignment pin (1) through the bushing and into the hole.
4. With the alignment pin in the desired hole, tighten the fixture retaining bolts (2).
5. Remove the alignment pin from the hole.
6. Install the sleeve (2) onto the drill (1), if required.
7. Drill out the threads of the damaged hole. Drill the hole until the stop collar of the drill bit or the sleeve contacts the bushing.
8. Using compressed air, clean out any chips.
9. Using a tap wrench, tap the threads of the drilled hole.
10. Using a TAP wrench, tap the threads of the drilled hole. In order to tap the new threads to the proper depth, rotate the tap into the hole until the mark (3) on the tap align with the top of the drill bushing (2).
11. Remove the fixture plate (1), bushing (2), and bolts.
12. Using compressed air, clean out any chips.
13. Spray cleaner into the hole. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
14. Using compressed air, clean any cutting oil and chips out of the hole.
15. Lubricate the threads of the installer tool (2) with the driver oil (1).
16. Install the insert (2) onto the driver tool (1).
17. Apply threadlock LOCTITE™ 277, EN 42385-109 loctite (1), or equivalent to the insert OD threads (2).
18. Install the insert and driver (1) into the hole. Rotate the driver tool until the mark on the tool aligns with the deck surface of the engine block. The installer tool will tighten up before screwing completely through the insert. This is acceptable. You are forming the bottom threads of the insert and mechanically locking the insert to the base material threads.

Service Prior to Assembly

The importance of cleanliness during assembly cannot be overstated. Dirt or debris will cause engine damage. An automobile engine is a combination of many machined, honed, polished and lapped surfaces with tolerances that are measured in ten thousandths of an inch. When any internal engine parts are serviced, care and cleanliness are important. A liberal coating of engine oil should be applied to friction areas during assembly in order to protect and lubricate the surfaces on initial operation. Throughout this section, it should be understood that proper cleaning and protection of machined surfaces and friction areas are part of the repair procedure. This is considered standard shop practice even if not specifically stated.

Lubricate all moving parts with engine oil or a specified assembly lubricant. This will provide lubrication for initial start up.

Engine Block Assemble

1. Install the piston oil nozzle assemblies (2), if equipped.
2. Install the piston oil nozzle bolts (1) and tighten to 10 N.m (89 lb in).
3. Lubricate the crankshaft position sensor O-ring with engine oil. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
4. Install the crankshaft position sensor (2) and bolt (1) and tighten to 10 N.m (89 lb in).
5. Install the knock sensor (1) at 6 O' clock. Install the bolt (2) and tighten to 25 N.m (18 lb ft).
6. Install the knock sensor (4) at 5 O' clock. Install the bolt (3) and tighten to 25 N.m (18 lb ft).
7. Install the engine oil pressure sensor (1) and tighten to 27 N.m (20 lb ft).
8. Install the engine coolant heater assembly (1), if equipped. Tighten the assembly to 50 N.m (37 lb ft).
9. If the engine coolant heater assembly is not equipped, install the engine coolant heater hole plug (2). Tighten the plug to 60 N.m (44 lb ft).
10. Apply sealant to all plugs prior to installation. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
11. Install the engine oil gallery cup plug (4).
12. Install the engine oil gallery plugs (2, 3), with sealant, and tighten to 65 N.m (48 lb ft).
13. Carefully align and install the engine block coolant baffle (1).
14. Install the engine oil gallery plug (1), with sealant, and tighten to 65 N.m (48 lb ft).
15. Install the engine oil gallery plug (2), with sealant, and tighten to 40 N.m (30 lb ft).

Crankshaft and Bearing Installation

Special Tools

1. EN-8087 Cylinder Bore Checking Gauge
2. EN 45059 Angle Meter

For equivalent regional tools, refer to Special Tools .

Scheme 96

Note. Crankshaft bearings MUST be separated, marked, or organized in a way to ensure installation to their original location and position, when suitable for use. If crankshaft bearing failure is due to other than normal wear, investigate the cause. Inspect the crankshaft or connecting rod bearing bores.

Inspect the connecting rod bearing bores or crankshaft main bearing bores using the following procedure

1. Tighten the bedplate to specification using the EN 45059 meter.
2. Measure the bearing bore for taper and out-of-round using the EN-8087 gauge (1).
3. No taper or out-of-round should exist.

Bearing Selection

1. Measure the bearing clearance to determine the correct replacement bearing insert size. There are two methods to measure bearing clearance. Method A gives more reliable results and is preferred. Method A yields measurement from which the bearing clearance can be computed. Method B yields the bearing clearance directly. Method B does not give any indication of bearing run-out.
2. To measure bearing clearance using Method A, use the following procedure: Measure the crankshaft bearing journal diameter with a micrometer in several places, 90 degrees apart. Average the measurements. Measure the crankshaft bearing journal taper and runout. Install the lower crankcase and tighten the bearing cap bolts to specification. Measure bearing inside diameter (ID) in several places 90 degrees apart, average measurements. Subtract journal measurement from bearing ID measurement to determine clearance. Determine whether clearance is within specification. If out of specification, choose different inserts. Measure the connecting rod inside diameter in the same direction as the length of the rod with an inside micrometer. Measure the crankshaft main bearing inside diameter with an inside micrometer.
3. To measure bearing clearance using Method B, use the following procedure: Clean the used bearing inserts. Install the used bearing inserts. Place a piece of gaging plastic across the entire bearing width at 90 degrees to block/lower crankcase split line. Install the bearing caps. CAUTION: In order to prevent the possibility of cylinder block or crankshaft bearing cap damage, the crankshaft bearing caps are tapped into the cylinder block cavity using a brass, lead, or a leather mallet before the attaching bolts are installed. Do not use attaching bolts to pull the crankshaft bearing caps into the seats. Failure to use this process may damage a cylinder block or a bearing cap. Install the bearing cap bolts to specification. NOTE: Do not rotate the crankshaft. Remove the bearing cap, leaving the gauging plastic in place. It does not matter whether the gauging plastic adheres to the journal or to the bearing cap. Measure the gauging plastic at its widest point with the scale (1) printed on the gauging plastic package. Remove the gauging plastic.

Crankshaft Installation

1. Install the upper crankshaft bearings (1) and lubricate bearing surfaces with engine oil.
2. Install the crankshaft upper thrust bearing (3) and lubricate bearing surfaces with engine oil.
3. Install the crankshaft (1) on the journals.

Lower Crankcase Installation

Special Tools

1. EN 45059 Angle Meter
2. EN-51380 Seal Installer

For equivalent regional tools, refer to Special Tools .

1. Install the lower bearing halves (2), without grooves, into the lower crankcase (1). Apply oil to bearing surfaces.
2. Apply a 4.25 mm bead of sealer directly in the groove (1) of the block to bedplate mating surfaces. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
3. Install the lower crankcase (2). Tap gently into place with a suitable tool if necessary. Ensure it is aligned properly on the dowels.
4. Install the NEW crankshaft bearing bolts (1) finger tight.
5. Install NEW lower crankcase perimeter bolts (3) finger tight.
6. Tighten the crankshaft bearing bolts in sequence using the following procedure: Tighten the crankshaft bearing bolts a first pass in sequence to 20 N.m (15 lb ft). Tighten the crankshaft bearing bolts a final pass in sequence using the EN 45059 meter an additional 140 degrees.
7. Tighten the lower crankcase perimeter bolts in sequence to 25 N.m (18 lb ft).
8. Install the engine oil gallery plugs (1, 2). Tighten the plugs to 65 N.m (48 lb ft).
9. Install the oil pump flow control valve (2) and bolts (1, 3). tighten the bolts to 10 N.m (89 lb in).
10. Using EN-51380 installer (2), install the crankshaft rear oil seal (1) flush or recessed up to 0.5 mm to block.
11. Rotate the crankshaft to ensure that it moves freely and does not bind.
12. Measure and record the crankshaft endplay. Refer to «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) .

Piston, Connecting Rod, and Bearing Installation

Note. This procedure is not used in Europe.

Special Tools

1. EN-8037 Ring Compressor
2. EN-43966 Connecting Rod Guides
3. EN 45059 Angle Meter

For equivalent regional tools, refer to Special Tools .

1. Install the connecting rod bearings. Use NEW bearings. NOTE: The connecting rod bearing anti-rotation tab grooves are to point toward the right-hand side of the engine. Install the bearing inserts into the connecting rod and the connecting rod cap. Lubricate the connecting rod bearings with engine oil.
2. Install the EN-43966 guides (2) into the connecting rod bolt holes. This protects the crankshaft journal during piston and connecting rod installation.
3. Install EN-8037 compressor , piston (1), and the connecting rod to the correct bore. Stagger each piston ring end gap equally around the piston. Lubricate the piston and the piston rings with engine oil. Do not disturb the piston ring end gap location. The piston must be installed so that the arrow mark on the top of the piston points to the front of the engine. Lubricate the engine bore with engine oil, then place the piston in its matching bore. Tap the piston into its bore with a hammer handle. Guide the connecting rod to the connecting rod journal while tapping the piston into place. Hold the EN-8037 compressor against the engine block until all the rings have entered the cylinder bore. Remove the connecting rod guides from the connecting rod bolt holes.
4. Install the connecting rod cap (1).
5. Install the NEW connecting rod bolts (2). Tighten all the connecting rod bolts a first pass to 25 N.m (18 lb ft). Tighten all the connecting rod bolts a final pass an additional 110 degrees using the EN 45059 meter.
6. Install the remaining connecting rods and piston assemblies.
7. Measure the connecting rod side clearance with a feeler gauge (1). Refer to «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) .
8. Measure the piston deck height. Refer to «Engine Mechanical Specifications (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-lcv) , «Engine Mechanical Specifications (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__engine-mechanical-specifications-ltg) .

Balancer Shaft with Oil Pump Installation

1. Install the balancer and oil pump shaft assembly (2).
2. Install the balancer and oil pump shaft assembly bolts (1) finger tight.
3. Tighten the bolts twice in sequence to 58 N.m (43 lb ft).

Cylinder Head Installation

Special Tools

EN 45059 Angle Meter

For equivalent regional tools, refer to Special Tools

1. If necessary, install NEW cylinder head locating pins.
2. Install the cylinder head gasket (3) to the block.
3. Install the cylinder head (2). Ensure the number 1 cylinder is at top dead center (TDC). The key on the crankshaft should be on top in the 12 o'clock position.
4. Install the NEW cylinder head bolts. Tighten the bolts in sequence to 30 N.m (22 lb ft). Tighten the bolts an additional 190 degrees in sequence using the EN 45059 meter.

Water Pump Installation (LCV)

Prior to installing the water pump, read the entire procedure. Pay special attention to avoid part damage and to ensure proper sealing.

1. Install a NEW water pump gasket (6) and the water pump assembly (5).
2. Install the water pump bolts (1). Finger tighten the bolts.
3. Tighten the water pump bolts to 25 N.m (18 lb ft).
4. Install a NEW thermostat assembly gasket (4) and the thermostat assembly (2).
5. Install the thermostat assembly bolts (3) and tighten to 10 N.m (89 lb in).
6. Install a NEW water outlet assembly gasket (3), and the water outlet assembly (1).
7. Install the water outlet assembly bolts (4) and tighten to 12 N.m (106 lb in).
8. Install the engine coolant temperature sensor (2).
9. Install the engine coolant temperature sensor retaining clip (5).
10. Connect the thermal bypass pipe (2) to the water outlet assembly.
11. Install a NEW thermal bypass pipe gasket (3) on the thermal bypass pipe. Install the thermal bypass pipe to the water pump assembly. Install the bolts (1) and tighten to 10 N.m (89 lb in).

Water Pump Installation (LTG)

Prior to installing the water pump, read the entire procedure. Pay special attention to avoid part damage and to ensure proper sealing.

1. Install a NEW water pump gasket (6) and the water pump assembly (5).
2. Install the water pump bolts (1). Finger tighten the bolts.
3. Tighten the water pump bolts in sequence to 25 N.m (18 lb ft).
4. Install a NEW thermostat assembly gasket (4) and the thermostat assembly (2).
5. Install the thermostat assembly bolts (3) and tighten to 10 N.m (89 lb in).
6. Install a NEW water outlet assembly gasket (3), and the water outlet assembly (1).
7. Install the water outlet assembly bolts (4) and tighten to 10 N.m (89 lb in).
8. Install the engine coolant temperature sensor (2).
9. Install the engine coolant temperature sensor retaining clip (5).
10. Connect the thermal bypass pipe (2) to the water outlet assembly.
11. Connect the thermal bypass hose to the engine oil cooler.
12. Install a NEW thermal bypass pipe gasket (3) on the thermal bypass pipe. Install the thermal bypass pipe to the water pump assembly. Install the bolts (1) and tighten to 10 N.m (89 lb in).

Exhaust Camshaft Installation

1. Install the camshaft bearing lower front cap (1).
2. Lubricate and install the hydraulic valve lash adjusters (1) into their bores in the cylinder head. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
3. Lubricate the valve tips. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
4. Lubricate the roller bearings with valve rocker arm lubricant. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
5. Position the valve rocker arm (1) on the tip of the valve stem and on the lash adjuster and lubricate. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
6. Lubricate the exhaust camshaft lobes and journals with camshaft lubricant. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
7. Set the exhaust camshaft (1) on top of the rocker arms in the camshaft bearing journals with the actuator timing mark at approximately the 1 O'clock position.
8. Install the camshaft cap bolts (3) into the camshaft caps (2).
9. Install the camshaft caps (2) and hand start the camshaft cap bolts (3).

Intake Camshaft Installation

1. Lubricate and install the hydraulic valve lash adjusters (1) into their bores in the cylinder head. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
2. Lubricate the valve tips. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
3. Lubricate the roller bearings with valve rocker arm lubricant. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
4. Position the valve rocker arm (1) on the tip of the valve stem and on the lash adjuster and lubricate. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
5. Lubricate the intake camshaft lobes and journals with camshaft lubricant. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) . Set the intake camshaft (3) on top of the roller followers in the camshaft bearing journals with the intake actuator timing mark at approximately the 11 O'clock position.
6. Install the camshaft cap bolts (1) into the camshaft caps (2, 4).
7. Install the camshaft caps (2) and hand start the camshaft cap bolts (1).
8. Install the camshaft rear cap (4) and hand start the camshaft cap bolts (1).
9. Tighten the camshaft cap bolts in sequence using the following procedure: Tighten the camshaft cap bolts in sequence to 8 N.m (71 lb in). Loosen both bolts in each cap in sequence to 180 degrees. Tighten the camshaft cap bolts in sequence to 10 N.m (89 lb in) twice.
10. Install the front camshaft bearing cap (1). Install the 2 outer bolts (5) for the front camshaft bearing cap finger tight.

Balancer Chain, Sprocket, and Tensioner Installation

Special Tools

EN-50837 Timing Chain Tensioner Retraction Tool

For equivalent regional tools, refer to Special Tools .

1. Assemble the crankshaft sprocket, balancer shaft driven sprocket, and balancer chain. Ensure the timing link (1) lines up with the timing mark (2) on the crankshaft sprocket. Ensure that both timing teeth (3) on the balancer shaft driven sprocket line up with the timing links (4).
2. Install the sprockets and chain (2) as an assembly to the crankshaft and balancer shaft assembly.
3. Install the crankshaft key (1).
4. Ensure the timing link (1) is aligned with the crankshaft sprocket timing mark (2).
5. Ensure the adjacent timing links (4) are aligned with both of the timing marks (3) on the balancer shaft driven sprocket.
6. Install the NEW balancer shaft driven sprocket bolt (1).
7. Use an 18 mm open end wrench over flat on balance shaft while tightening the balancer shaft sprocket bolt to specification. Tighten the balancer shaft driven sprocket bolt to 40 N.m (30 lb ft) plus 50 degrees.
8. Install the balancer chain guide (2).
9. Install the balancer chain guide bolts (1). Tighten the bolts to 10 N.m (89 lb in).
10. Install the balancer chain tensioner (2).
11. Install the balancer chain tensioner bolts (1). Tighten the bolts to 10 N.m (89 lb in).
12. Remove EN-50837 retention tool to restore the tension to the balancer chain.

Oil Pan Installation (LCV)

1. Apply a bead of RTV sealant to the perimeter of the lower oil pan.
2. Install the lower oil pan (1) to the upper oil pan.
3. Install the short lower oil pan bolts (2) and tighten to 10 N.m (89 lb in).
4. Apply a 4.25 mm bead of sealer (1) on the level part of the flange around the perimeter of the oil pan. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) .
5. Install the oil pan (1).
6. Install the oil pan bolts (2, 3) finger tight.
7. Tighten the oil pan bolts in sequence to final torque twice using the following procedure: Tighten bolts in sequence 1-11 to 25 N.m (18 lb ft). Tighten bolts in sequence 12-13 to 10 N.m (89 lb in).
8. Insert the oil filter fitting (1). Tighten the fitting to 50 N.m (37 lb ft).
9. Install the oil pump flow control valve cover (3).
10. Install the valve cover bolts (1, 4) and tighten to 9 N.m (80 lb in).
11. Install the valve cover bolt (2) and tighten to 58 N.m (43 lb ft).

Oil Pan Installation (LTG)

1. Apply a 4.25 mm bead of sealer (1) on the level part of the flange around the perimeter of the oil pan. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
2. Install the oil pan (1).
3. Install the oil pan bolts (2-5) finger tight.
4. Tighten the oil pan bolts in sequence to final torque twice using the following procedure: Tighten bolts in sequence 1-11 to 25 N.m (18 lb ft). Tighten bolts in sequence 12-13 to 10 N.m (89 lb in).
5. Install the engine oil cooler (1).
6. Install the engine oil cooler bolt (2) and tighten to 10 N.m (89 lb in).
7. Apply a bead of RTV sealant to the perimeter of the lower oil pan.
8. Install the lower oil pan (2).
9. Install the lower oil pan bolts (1) and tighten to 10 N.m (89 lb in).

Camshaft Timing Chain and Tensioner Installation

Special Tools

1. EN 45059 Angle Meter
2. EN 50837 Timing Chain Tensioner Retraction Tool

For equivalent regional tools, refer to Special Tools .

1. Install the timing chain oil nozzle (1).
2. Loop the timing chain over the intake and exhaust camshaft actuators, aligning one of the same colored links (2) with the timing mark on the exhaust camshaft actuator (3).
3. Ensure the crankshaft key in the 12 O'clock position. Loop the timing chain onto the crankshaft sprocket.
4. Install the timing chain guide (2) and upper bolt (1) only, finger tight.
5. Install the timing chain tensioner pivot arm (3).
6. Install the pivot arm bolt (1) finger tight.
7. With a suitable tool, rotate the crankshaft counterclockwise to align the timing mark on the crankshaft sprocket (1) with the unique colored timing link (2).
8. Rotate the lower end of the fixed timing chain guide into installation position and install the lower bolt (3).
9. Tighten the timing chain guide upper and lower bolts to 25 N.m (18 lb ft).
10. Using a suitable tool, rotate the intake camshaft counterclockwise until the timing mark on the intake actuator (2) is aligned with the corresponding same colored timing link (1). Maintain tension on intake camshaft until the timing chain tensioner can be installed and activated.
11. While maintaining the intake camshaft actuator timing alignment, install the timing chain tensioner (2) and bolts (1) and tighten to 25 N.m (18 lb ft).
12. Tighten the pivot arm bolt to 25 N.m (18 lb ft).
13. Remove EN-50837 retraction tool.
14. Verify the timing links on the timing chain are properly aligned to the timing marks: The same colored timing links (1, 2) are aligned to the appropriate timing marks on the camshaft actuators (6, 3). The unique colored link (5) is aligned to the timing mark on the crankshaft sprocket (4).
15. If they are not, repeat the portion of the procedure necessary to align the timing marks.
16. Install the timing chain guide (1) and bolts (2, 3) finger tight.
17. Tighten the front camshaft cap bolts in sequence to 10 N.m (89 lb in) twice.
18. Rotate the crankshaft slightly in a clockwise direction. If the timing chain jumps actuator teeth, repeat procedure to align the timing marks.
19. Verify the timing links on the balance chain are properly aligned to the timing marks: The timing link (1) is aligned to the timing mark on the crankshaft sprocket (2). The adjacent timing links (4) are aligned with both timing marks (3) on the balancer shaft driven sprocket.
20. Verify the timing links on the timing chain are properly aligned to the timing marks: The same colored timing links (1, 2) are aligned to the appropriate timing marks on the camshaft actuators (6, 3). The unique colored link (5) is aligned to the timing mark on the crankshaft sprocket (4).
21. If they are not, repeat the portion of the procedure necessary to align the timing marks.

Engine Front Cover Installation

Special Tools

EN-50820 Front Crankshaft Seal Installer

For equivalent regional tools, refer to Special Tools .

1. Using EN-50820 installer , install the front crankshaft seal (1) into the engine front cover.
2. Apply a 5 mm bead of sealer directly in the flange (1) of the engine front cover perimeter mating surface. Also apply a 5 mm bead of sealer directly to the locations indicated (2). Finally, apply a 14 mm dab of sealant at the locations indicated (3). Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
3. Install the engine front cover (1).
4. Hand start the engine front cover bolts (2-6, 7).
5. Tighten the engine front cover bolts in sequence to final torque twice: Tighten sequence 1-3 bolts to 58 N.m (43 lb ft). Tighten sequence 4-11 bolts to 25 N.m (18 lb ft). Tighten sequence 12 bolt to 25 N.m (18 lb ft). Tighten sequence 13-15 bolts to 25 N.m (18 lb ft). Tighten sequence 16-17 bolts to 10 N.m (89 lb in). Tighten sequence 18-19 bolts to 10 N.m (89 lb in). Tighten sequence 20 bolt to 25 N.m (18 lb ft).
6. Install the accessory drive belt tensioner (2).
7. Install the accessory drive belt tensioner bolt (1) and tighten to 58 N.m (43 lb ft).

Camshaft Cover Installation (LCV)

1. Assemble the camshaft cover (2) and a NEW gasket (4). Ensure that the gasket is located in the retaining groove in the camshaft cover.
2. Install the cover on the cylinder head and hand start the bolts (1, 3).
3. Tighten the camshaft cover bolts in sequence to 10 N.m (89 lb in).
4. Inspect the vacuum pump seal. Refer to «Camshaft Cover Cleaning and Inspection»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle) .
5. Install a NEW vacuum pump assembly gasket (3) on the vacuum pump assembly (2).
6. Install the vacuum pump assembly (2) and bolts (1). Tighten the bolts to 10 N.m (89 lb in).
7. Install the camshaft position actuator control solenoid valves (2) and bolts (1). Tighten the bolts to 10 N.m (89 lb in).
8. Inspect the inside of the ignition coil rubber boot for a thin, even coat of grease. If there is no grease present or additional grease is necessary, complete the following procedure: Apply a thin coating of dielectric grease evenly to the inside of the ignition coil rubber boot, up to a depth of 15 mm from the end of the boot. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) . Remove any excess grease from around the end of the boot, and ensure there is not an excessive amount within the boot.
9. Install the ignition coils (2) and bolts (1). Tighten the bolt to 10 N.m (89 lb in).
10. Install the front lift bracket (2).
11. Install the front lift bracket bolts (1) and tighten to 25 N.m (18 lb ft).
12. Install the rear lift bracket (1).
13. Install the rear lift bracket bolts (2) and tighten to 25 N.m (18 lb ft).
14. Install the camshaft cover heat shield (2) and bolts (1). Tighten the bolts to 10 N.m (89 lb in).
15. Inspect the oil level indicator O-ring seals (4) and replace if necessary.
16. Lubricate the O-ring seals (4) with engine oil and install the oil level indicator (3).
17. Inspect the O-ring (3) on the engine coolant air bleed pipe. Replace if necessary. Install the engine coolant air bleed pipe (2).
18. Install the pipe bolt (1) and tighten to 10 N.m (89 lb in).
19. Install the PCV hose assembly (1) at the quick-connect fittings.

Camshaft Cover Installation (LTG)

1. Assemble the camshaft cover (2) and a NEW gasket (4). Ensure that the gasket is located in the retaining groove in the camshaft cover.
2. Install the cover on the cylinder head and hand start the bolts (1, 3).
3. Tighten the camshaft cover bolts in sequence to 10 N.m (89 lb in).
4. Inspect the vacuum pump seal. Refer to «Camshaft Cover Cleaning and Inspection»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle) .
5. Install a NEW vacuum pump assembly gasket (3) on the vacuum pump assembly (2).
6. Install the vacuum pump assembly (2) and bolts (1). Tighten the bolts to 10 N.m (89 lb in).
7. Install the camshaft position actuator control solenoid valves (2) and bolts (1). Tighten the bolts to 10 N.m (89 lb in).
8. Inspect the inside of the ignition coil rubber boot for a thin, even coat of grease. If there is no grease present or additional grease is necessary, complete the following procedure: Apply a thin coating of dielectric grease evenly to the inside of the ignition coil rubber boot, up to a depth of 15 mm from the end of the boot. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) . Remove any excess grease from around the end of the boot, and ensure there is not an excessive amount within the boot.
9. Install the ignition coils (2) and bolts (1). Tighten the bolt to 10 N.m (89 lb in).
10. Install the front lift bracket (2).
11. Install the front lift bracket bolts (1) and tighten to 25 N.m (18 lb ft).
12. Install the rear lift bracket (1).
13. Install the rear lift bracket bolts (2) and tighten to 25 N.m (18 lb ft).
14. Install the camshaft cover heat shield (2) and bolts (3). Tighten the bolts to 10 N.m (89 lb in).
15. Inspect the oil level indicator O-ring seals (4) and replace if necessary. Install the oil level indicator (1).
16. Inspect the O-ring (4) on the engine coolant air bleed pipe. Replace if necessary.
17. Install the engine coolant air bleed hose (3), if necessary.
18. Install the engine coolant air bleed pipe (2).
19. Install the pipe bolt (1) and tighten to 10 N.m (89 lb in).
20. Install the PCV hose assembly (1) at the quick-connect fittings.
21. Install the PCV hose bolt (2) and tighten to 12 N.m (106 lb in).

Fuel Rail and Injectors Installation

Special Tools

EN-47909 Injector Bore and Sleeve Cleaning Kit

For equivalent regional tools, refer to Special Tools .

1. Clean the fuel injector bore in the cylinder head using the EN-47909 kit.
2. Replace the fuel rail insulators, if necessary. Refer to «Fuel Rail and Injectors Cleaning and Inspection»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-repair-instructions-off-vehicle__fuel-rail-and-injectors-cleaning-and) . Replace the fuel rail bolts, if necessary.
3. Install the fuel rail (1) with injectors into the cylinder head evenly.
4. Hand start the 2 outer fuel rail bolts (2) to seat the injectors into the injector bores.
5. Hand start the remaining fuel rail bolts.
6. Tighten the fuel rail bolts in sequence to 25 N.m (18 lb ft).
7. Connect the electrical harness to the fuel rail harness connections.
8. Install the fuel injection fuel rail noise shield (1).

Secondary Air Injection Check Valve Installation

1. Install a NEW secondary air injection check valve gasket (1).
2. Install the secondary air injection check valve (2).
3. Install the secondary air injection check valve bolts (3). Tighten the bolts to 25 N.m (18 lb ft).

Exhaust Manifold Installation (LTG)

1. Install a NEW exhaust manifold gasket (2).
2. Install the exhaust manifold (1) to the cylinder head.
3. Hand start NEW exhaust manifold to cylinder head retaining bolts (3).
4. Tighten the NEW exhaust manifold to cylinder head bolts three passes in sequence to 20 N.m (15 lb ft).
5. Install the exhaust manifold brace (2).
6. Install the exhaust manifold brace bolts (3) and tighten to 25 N.m (18 lb ft)
7. Install NEW exhaust manifold brace nuts (1) and tighten to 25 N.m (18 lb ft)
8. Install the exhaust manifold heat shield (1).
9. Install the exhaust manifold heat shield bolts (2) and tighten to 14 N.m (124 lb in).

Exhaust Manifold Installation (LCV)

1. Install a NEW exhaust manifold gasket (1).
2. Install the exhaust manifold (2) to the cylinder head.
3. Hand start NEW exhaust manifold to cylinder head retaining bolts (3).
4. Tighten the NEW exhaust manifold to cylinder head bolts three passes in sequence to 20 N.m (15 lb ft).
5. Install the exhaust manifold heat shield (1).
6. Install the exhaust manifold heat shield bolts (2) and tighten to 14 N.m (124 lb in).
7. Coat the threads of the oxygen sensor (1) with antiseize. Refer to «Adhesives, Fluids, Lubricants, and Sealers (LCV)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-lcv) , «Adhesives, Fluids, Lubricants, and Sealers (LTG)»(/cadillac/ats/i-2012-2014/remont/mechanical/#engine-mechanical-20l-ltg-or-25l-lcv-specifications__adhesives-fluids-lubricants-and-sealers-ltg) .
8. Install the oxygen sensor and tighten to 42 N.m (31 lb ft).

Intake Manifold Installation

Special Tools

EN-50790 HP Fuel Pump Installation Alignment Gauge

For equivalent regional tools, refer to Special Tools .

1. Install a NEW gasket (1) on the intake manifold (2). Install the intake manifold and hand start the intake manifold bolts (3, 4).
2. Tighten the bolts and nuts in sequence twice to 12 N.m (106 lb in).
3. Install the MAP sensor (2) and bolt (1). Tighten the bolt to 5 N.m (44 lb in).
4. Use the EN-50790 alignment gauge (2) to ensure that the camshaft lobe is in the base circle position. At base circle position, the tool will be flush with the head (1).
5. Lubricate the high pressure fuel pump cylinder head bore with 5W30 engine oil.
6. Lubricate the high pressure fuel pump roller lifter (1) with 5W30 engine oil and install into the cylinder head bore.
7. Install a NEW fuel pump housing O-ring (2) and gasket (3).
8. Install the fuel pump assembly (4).
9. Hand start the fuel pump assembly bolts (5) evenly. Tighten the fuel pump bolts evenly to 15 N.m (11 lb ft).
10. Hand start both ends of the NEW fuel feed intermediate pipe (7). Tighten the fitting nut to the fuel rail to 15 N.m (11 lb ft). Tighten the fitting nut to the fuel pump to 15 N.m (11 lb ft). Tighten the fitting nut to the fuel rail a final pass to 30 N.m (22 lb ft). Tighten the fitting nut to the fuel pump a final pass to 30 N.m (22 lb ft).
11. Install the fuel pump insulator (6).
12. Hand start the fitting nut on the fuel feed pipe (4). Tighten the fitting nut to 30 N.m (22 lb ft).
13. Install the fuel feed pipe stud (3).
14. Install the fuel pump cover (2) and bolts (1). Tighten the bolts to 10 N.m (89 lb in).
15. Connect the hose on the radiator inlet pipe assembly (2) to the water outlet assembly.
16. Install the radiator inlet pipe bolt (1).
17. Install a new throttle body gasket (2).
18. Install the throttle body (1).
19. Install the throttle body bolts (3) and tighten to 10 N.m (89 lb in).
20. Install the EVAP canister valve tube assembly (2).
21. Install the EVAP canister valve (1) and connect the EVAP canister valve tube.
22. Install the upper intake manifold bracket (2) and bolts (3).
23. Install the intake manifold cover (4) onto the camshaft cover.
24. Install the intake manifold cover bolt (5) and tighten to 9 N.m (80 lb in).
25. Install the oil fill cap (6).
26. Install the fuel pump insulator (1).

Turbocharger Installation

1. Install the turbocharger oil feed pipe (2) and NEW washers (3) onto the turbocharger.
2. Install the turbocharger oil feed pipe bolt (1) and tighten to 35 N.m (26 lb ft).
3. Install a NEW turbocharger oil return pipe gasket (4).
4. Install the turbocharger oil return pipe (5) onto the turbocharger.
5. Install the turbocharger oil return pipe bolts (6) and tighten to 10 N.m (89 lb in).
6. Install a NEW turbocharger gasket (3) on the turbocharger.
7. Install NEW turbocharger oil feed and oil return pipe gaskets (4, 5).
8. Install the turbocharger (1).
9. Install NEW turbocharger nuts (2) finger tight.
10. Install the turbocharger oil feed and return pipe bolts (6) at the engine block. tighten the bolts to 10 N.m (89 lb in).
11. Install the PCV hose and fitting assembly (1) to the turbocharger. Install the PCV hose fitting assembly bolt (2) and tighten to 8 N.m (71 lb in).
12. Tighten the turbocharger nuts in sequence to 30 N.m (22 lb ft) plus 90 degrees.
13. Install the turbocharger bypass valve solenoid (2).
14. Install the turbocharger bypass valve solenoid bolts (1) and tighten to 8 N.m (71 lb in).
15. Install the turbocharger wastegate regulator solenoid valve (1).
16. Install the turbocharger wastegate regulator solenoid valve bracket bolt (2) and tighten to 8 N.m (71 lb in).
17. Connect the turbocharger wastegate regulator solenoid valve hoses to the turbocharger.
18. Install the turbocharger coolant feed pipe (5) and NEW washers (2) on the turbocharger.
19. Install the turbocharger coolant feed pipe bolt (1) and tighten to 35 N.m (26 lb ft).
20. Install a NEW turbocharger coolant feed pipe gasket (4).
21. Install the turbocharger coolant feed pipe bolts (3) and tighten to 10 N.m (89 lb in).
22. Connect the turbocharger coolant feed pipe hose to the engine oil cooler.
23. Install the turbocharger coolant return pipe (2) and NEW washers (4, 5) on the turbocharger.
24. Install the turbocharger coolant return pipe bolt (3) and tighten to 35 N.m (26 lb ft).
25. Connect the turbocharger coolant return pipe to the air bleed hose.
26. Install the camshaft cover heat shield bolt (1) that retains the turbocharger coolant return pipe (2) at the camshaft cover. Tighten the bolt to 10 N.m (89 lb in).
27. Install the turbocharger wastegate actuator (2) and actuator bolts (1) and tighten to 8 N.m (71 lb in).
28. Install the turbocharger wastegate actuator arm retainer (3).
29. Install the turbocharger heat shield (2).
30. Install the turbocharger heat shield bolts (1, 3) and tighten to 14 N.m (124 lb in).

Engine Flywheel Installation

Special Tools

1. EN-50792 Flywheel Holding Tool
2. EN-45059 Angle Meter

For equivalent regional tools, refer to Special Tools .

1. Install the flywheel (2) and hand start NEW bolts (1).
2. To prevent crankshaft rotation, install EN-50792 flywheel holding tool (2) and starter motor bolts (1) at the starter motor location and engaging the flywheel.
3. Tighten the bolts evenly using the following procedure: Tighten the bolts a first pass in sequence to 20 N.m (15 lb ft). Tighten the bolts a second pass in sequence to 30 N.m (22 lb ft). Tighten the bolts a final pass in sequence 80 degrees using the EN-45059 meter.
4. Remove EN-50792 flywheel holding tool.

Automatic Transmission Flex Plate Installation

Special Tools

1. EN-50792 Flywheel Holding Tool
2. EN-45059 Angle Meter

For equivalent regional tools, refer to Special Tools .

1. Install the flywheel (2) and hand start NEW bolts (1).
2. To prevent crankshaft rotation, install EN-50792 flywheel holding tool (2) and starter motor bolts (1) at the starter motor location and engaging the flywheel.
3. Tighten the bolts evenly using the following procedure: Tighten the bolts a first pass in sequence to 20 N.m (15 lb ft). Tighten the bolts a second pass in sequence to 30 N.m (22 lb ft). Tighten the bolts a final pass in sequence 40 degrees using the EN-45059 meter.
4. Remove EN-50792 flywheel holding tool.

Crankshaft Balancer Installation

Special Tools

1. EN 45059 Angle Meter
2. EN 48034 Crankshaft Balancer Installer
3. EN-50792 Flywheel Holding Tool

For equivalent regional tools, refer to Special Tools .

1. To prevent crankshaft rotation, install EN-50792 flywheel holding tool (2) and starter motor bolts (1) at the starter motor location and engaging the flywheel.
2. Using EN-48034 installer , install the crankshaft balancer (2).
3. Install a NEW crankshaft balancer bolt and washer. Tighten the bolt to 150 N.m (111 lb ft) plus 180 degrees using the EN 45059 meter.
4. Remove EN-50792 flywheel holding tool.

Oil Filter Installation

1. Lubricate the O-ring on the oil filter with 5W30 engine oil.
2. Install a new oil filter (1).
3. Tighten the oil filter to 30 N.m (22 lb ft).

Engine Prelubing

Note. This procedure is not used in Europe.

Special Tools

EN-45299 Engine Preluber

For equivalent regional tools, refer to Special Tools .

1. Remove the engine oil pressure sensor (1).
2. Install the M12 x 1.75 adapter P/N 509376.
3. Install the flexible hose to the adapter and open the valve.
4. Pump the handle on the EN-45299 preluber (1) in order to flow a minimum of 1-1.9 liters (1-2 quarts) of engine oil. Observe the flow of engine oil through the flexible hose and into the engine assembly.
5. Close the valve and remove the flexible hose and adapter from the engine.
6. Install the engine oil pressure sensor and tighten to 27 N.m (20 lb ft).
7. Top-off the engine oil to the proper level.

See also:
• Fastener Caution
• Special Tools
• Engine Mechanical Specifications (LCV)
• Engine Mechanical Specifications (LTG)
• Safety Glasses Warning
• Separating Parts
• Adhesives, Fluids, Lubricants, and Sealers (LCV)
• Adhesives, Fluids, Lubricants, and Sealers (LTG)
• Component Fastener Tightening Caution
• Symptoms - Engine Mechanical (LTG)
• Safety Glasses and Compressed Air Warning
• Cleaning Solvent Warning
• Turbocharger Cleaning and Inspection
• Thread Repair
• Engine Block Cleaning and Inspection
• Piston, Connecting Rod, and Bearing Installation
• Fuel Rail and Injectors Cleaning and Inspection