Engine Mechanical - 2.4L: Overhaul GMC Terrain I

Engine Block Disassemble

1. Remove the engine block coolant drain plug.
2. Remove the oil flow check valve.
3. Remove the rear oil passage plugs (3).
4. Remove the 3 oil passage plugs on each side of the block (2).
5. Remove the 2 water passage plugs on the top of the block (1).
6. Remove the 2 front oil passage plugs.
7. Remove the knock sensor (1) and bolt.
8. Remove the oil pressure switch (2).
9. Remove the crankshaft position (CKP) sensor (1) and bolt.
10. If equipped, loosen the piston oil nozzle assembly (1) bolt and remove the piston oil nozzle assembly.

Piston and Connecting Rod Disassemble

Special Tools

EN-46745 Piston Pin Retainer Remover and Installer

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).
3. Remove the piston pin (1) and the connecting rod (3) from the piston (2).

Piston and Connecting Rod Assemble

Special Tools

EN-46745 Piston Pin Retainer Remover and Installer

For equivalent regional tools, refer to Special Tools .

1. The cast boss (1), on the underside of the piston, must go to the rear of the block.
2. The larger feature (1), at the split line located on one side of the connecting rod, must go to the front of the block.
3. Assemble the connecting rod (2) and the piston (1).
4. Use the following procedure to assemble the piston pin and the retainer: Coat the piston pin with oil. Install one side of one piston pin retainer into the retaining groove using EN-46745 installer. 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 piston pin retainer, using EN-46745 installer (1). Ensure that the piston moves freely.
5. Install the following components of the oil control ring assembly (bottom ring): The expander (5) The lower oil control ring (4) The upper control ring (3)
6. Install the lower compression ring (2). Place the manufacturer's mark facing up.
7. Install the upper compression ring (1).

Cylinder Head Disassemble (LAF, LEA, or LUK)

Special Tools

1. EN-8062 Valve Spring Compressor
2. EN-36017 Valve Seal Remover
3. EN-43963 Valve Spring Compressor (off car)

For equivalent regional tools, refer to Special Tools .

1. Remove the coolant air bleed hose fitting (1).
2. Remove the intake camshaft position sensor (1) and bolt.
3. Perform the following procedure to remove the valve keys, springs, and retainers: Using the EN-8062 compressor and the EN-43963 compressor, compress the valve spring. Remove the valve keys. Slowly release the EN-8062 compressor and the EN-43963 compressor from the valve spring assembly. Remove the retainer.
4. Remove the springs.
5. Using EN-36017 remover, remove the valve seals. Discard the seals, do not reuse.
6. Remove the valves.
7. Remove the cylinder head plugs.

Cylinder Head Assemble (LAF, LEA, or LUK)

Special Tools

1. EN-8062 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 NEW cylinder head plugs. Coat the plugs with sealer. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(ref-491134-S31490395222012073000000) .
2. 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
3. Inspect the valves and the valve seats. Refer to «Valve and Seat Grinding»(ref-491134-S23337312222012073000000) .
4. Install the valves (1). Replace the valves, if required.
5. Install the NEW valve seals (1). Fully seat the seals on the valve guides.
6. Install the springs (1).
7. Install the retainers and keys using the following procedure: Install the retainer (2). Using the EN-8062 compressor and the EN-43963 compressor, compress the valve spring. Install the valve keys (1). Slowly release the EN-8062 compressor and the EN-43963 compressor (off car) from the valve/spring assembly. Inspect for proper valve key seating.
8. Lubricate the camshaft position sensor O-ring with clean engine oil.
9. Install the intake camshaft position sensor (1) and bolt. Tighten the bolt to 10 N.m (89 lb in).
10. Install the cylinder head air bleed tube (1) and tighten the tube to 15 N.m (11 lb ft).

Oil Pump Disassemble

1. Remove the pressure relief plug (1), spring (2), and plunger (3).
2. Remove the oil pump gerotor cover (1) and bolts.
3. Clean all of the parts in cleaning solvent. Remove varnish, sludge and dirt.
4. Inspect the oil pump (2, 3) for wear and scoring. Ensure that all components are within specifications. Refer to «Engine Mechanical Specifications (LAF, LEA, or LUK)»(ref-491134-S07132447052012073000000) . Replace the front cover (4) and oil pump assembly if it is out of specification or damaged.

Oil Pump Assemble

1. Lubricate all oil pump parts with engine oil.
2. Install the inner gear (2) into the outer gear (3).
3. Install the gears together into the front cover (4) with the hub of the center gear facing the front cover.
4. Install the oil pump gerotor cover (1) and bolts and tighten to 6 N.m (53 lb in).
5. Install the pressure relief valve plunger (3).
6. Install the pressure relief valve spring (2).
7. Install and tighten the pressure relief valve plug (1) to 40 N.m (30 lb ft).

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. Apply sealant to all plugs (1, 2, 3) prior to installation. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(ref-491134-S31490395222012073000000) .
2. Install the drain plug, with sealant, in the water pump.
3. Install the coolant jacket plugs, with sealant, and tighten to 35 N.m (26 lb ft).
4. Install the rear oil passage plugs, with sealant, and tighten to 60 N.m (44 lb ft).
5. Install the other oil passage plugs, with sealant, and tighten to 35 N.m (26 lb ft).
6. Lubricate the crankshaft position sensor O-ring with engine oil. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(ref-491134-S31490395222012073000000) .
7. Install the crankshaft position sensor (1) and bolt and tighten to 10 N.m (89 lb in).
8. Install the oil pressure switch (2) and tighten to 26 N.m (19 lb ft).
9. Install the knock sensor (1) and bolt and tighten to 25 N.m (18 lb ft).
10. Install the piston oil nozzle assemblies (1), if equipped.
11. Install the piston oil nozzle assembly bolts and tighten to 15 N.m (11 lb ft).

Assembling Components

1. When assembling components, use only the sealant specified or equivalent in the service procedure.
2. Sealing surfaces should be clean and free of debris or oil.
3. Specific components such as crankshaft oil seals or valve stem oil seals may require lubrication during assembly.
4. Components requiring lubrication will be identified in the service procedure.
5. When applying sealant to a component, apply the amount specified in the service procedure.
6. Do not allow the sealant to enter into any blind threaded holes, as it may prevent the bolt from clamping properly or cause component damage when tightened.
7. Tighten bolts to specifications. Do not overtighten.