Engine Lubrication System (H4SO) (except Sti) Subaru Impreza WRX STI GR

SPECIFICATION

SPECIFICATION CHART

Recommended oil

Oil corresponding to either of the following standards.

1. For API standard, oil with SM "Energy Conserving" logo
2. For ILSAC standard, oil with GF-4 "Star burst mark" label on the container

Scheme 51

Note. The proper viscosity oil helps the engine maintain its ideal temperature, and cranking speed increased by reducing viscosity friction in hot condition. If the vehicle is used in regions of high temperatures or in other severe environments, use oil with the viscosities shown below.

API standard: SM or SL

SAE viscosity No: 30, 40,10W-50, 20W-40, 20W-50

COMPONENT

1. Non-turbo model

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Tightening torque: N.m (kgf-m, ft-lb)

T1: 5 (0.5, 3.7)

T2: 6.4 (0.7, 4.7)

T3: 10 (1.0, 7.4)

T4: 25 (2.5, 18.4)

T5: 44 (4.5, 32.5)

T6: 5.4 (0.6, 4.0)

T7: 45 (4.6, 33.2)

T8: 70 (7.1, 51.6)

1. Turbo model

Scheme 53

Tightening torque: N.m (kgf-m, ft-lb)

T1: 5 (0.5, 3.7)

T2: 5.4 (0.6, 4.0)

T3: 6.4 (0.7, 4.7)

T4: 10 (1.0, 7.0)

T5: 25 (2.5, 18.4)

T6: 44 (4.5, 32.5)

T7: 45 (4.6, 33.2)

T8: 70 (7.1, 51.6)

CAUTION

1. Wear appropriate work clothing, including a cap, protective goggles and protective shoes when performing any work.
2. Remove contamination including dirt and corrosion before removal, installation or disassembly.
3. Keep the disassembled parts in order and protect them from dust and dirt.
4. Before removal, installation or disassembly, be sure to clarify the failure. Avoid unnecessary removal, installation, disassembly and replacement.
5. Vehicle components are extremely hot after driving. Be wary of receiving burns from heated parts.
6. Be sure to tighten fasteners including bolts and nuts to the specified torque.
7. Place shop jacks or rigid racks at the specified points.
8. Before disconnecting connectors of sensors or units, be sure to disconnect the ground cable from battery.
9. If the engine oil is split over exhaust pipe or the under cover, wipe it off with cloth to avoid emitting smoke or causing a fire.
10. Prepare a container and cloth to prevent scattering of oil when performing work where oil can be spilled. If the oil spills, wipe it off immediately to prevent from penetrating into floor or flowing out for environmental protection.
11. Follow all government and local regulations concerning disposal of refuse when disposing of oil.

SPECIAL TOOL

SPECIAL TOOL DESCRIPTION ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS 18332AA000 OIL FILTER WRENCH Used for removing and installing oil filter (Black). (Outer diameter: 68 mm (2.68 in)) 499587100 OIL SEAL INSTALLER Used for installing oil seal into oil pump

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GENERAL TOOL

GENERAL TOOL DESCRIPTION

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INSPECTION

DIAGNOSIS PROCEDURE CHART

1. Park the vehicle on a level surface.
2. Remove the oil level gauge and wipe away the oil.
3. Reinsert the oil level gauge all the way. Be sure that the oil level gauge is correctly inserted and properly orientated.
4. Pull out the oil level gauge again, and check the oil level. If the engine oil level is below "L" line, make sure that there is no oil leakage from the engine, then add oil to raise the level up to the "P" line.
5. Start the engine, and spread the oil in engine room.
6. After turning off the engine, wait a few minutes for the oil to return to the oil pan before checking the level.

Note. Just after driving or while the engine is warm, engine oil level shows in the range between the F line and the notch mark. This is caused by thermal expansion of engine oil. To prevent overfilling of engine oil, do not add oil above "P" line when the engine is cold. As the oil level gauge is used for daily maintenance, "P" line and "L" line is set assuming that the engine is cold.

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REPLACEMENT

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1. Set the vehicle on a lift.
2. Open the engine oil filler cap for quick draining of engine oil.
3. Lift up the vehicle.
4. Drain engine oil by loosening the engine oil drain plug. NOTE: Prepare the container for draining of engine oil. Non-turbo model Turbo model
5. Tighten the engine oil drain plug after draining engine oil. NOTE: Use a new drain plug gasket. Tightening torque: 44 N.m (4.5 kgf-m, 32.5 ft-lb) Non-turbo model Turbo model
6. Lower the vehicle.
7. Using engine oil of proper quality and viscosity, fill engine oil through the filler duct to the "F" line on the oil level gauge. Make sure that the vehicle is parked on a level surface when checking oil level. Recommended oil: Refer to «SPECIFICATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/lubrication-system/#engine-lubrication-system-h4so-except-sti__specification) for recommended oil. Engine oil capacity: Refer to «SPECIFICATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/lubrication-system/#engine-lubrication-system-h4so-except-sti__specification) for engine oil capacity.
8. Close the engine oil filler cap.
9. Start the engine, and spread the oil in engine room.
10. After stopping the engine, recheck the oil level. If necessary, add engine oil up to the "F" line on oil level gauge.

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1. Set the vehicle on a lift.
2. Disconnect the ground cable from battery.
3. Remove the radiator. Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system-h4so-except-sti) , Radiator. Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system-h4dotc-except-sti) , Radiator.
4. Remove the crankshaft position sensor. Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/fuel-system/#fuel-injection-system-h4so-except-sti) , Crankshaft Position Sensor. Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/fuel-system/#fuel-injection-system-h4dotc) , Crankshaft Position Sensor.
5. Remove the water pump. Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system-h4so-except-sti__removal) , Water Pump. Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system-h4dotc-except-sti__removal) , Water Pump.
6. Remove the crank sprocket. Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/mechanical/#engine-mechanical-h4so-except-sti) , Crank Sprocket. Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/mechanical/#engine-mechanical-h4dotc-except-sti) , Crank Sprocket.
7. Remove the bolts which secure oil pump to cylinder block. NOTE: When disassembling and checking the oil pump, loosen the relief valve plug before removing the oil pump.
8. Remove the oil pump by using flat tip screwdriver. CAUTION: Be careful not to scratch mating surfaces of cylinder block and oil pump.
9. Remove the front oil seal from the oil pump.

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1. Using the ST, install the front oil seal. ST 499587100 OIL SEAL INSTALLER NOTE: Use a new front oil seal.
2. Apply liquid gasket to the mating surfaces of oil pump. NOTE: Install within 5 min. after applying liquid gasket. Liquid gasket: THREE BOND 1217G (Part No. K0877Y0100) or equivalent
3. Apply a coat of engine oil to the inside of front oil seal.
4. Install the oil pump to cylinder block. Be careful not to damage the front oil seal during installation. NOTE: Make sure the front oil seal lip is not folded. Align the flat surface of oil pump's inner rotor with crankshaft before installation. Use new O-rings. Do not forget to assemble O-rings.
5. Apply liquid gasket to the three bolts thread shown in figure, (when reusing bolts) Liquid gasket: THREE BOND 1324 (Part No. 004403042) or equivalent Tightening torque: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb)
6. Install the crank sprocket. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/mechanical/#engine-mechanical-h4so-except-sti) , Crank Sprocket. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/mechanical/#engine-mechanical-h4dotc-except-sti) , Crank Sprocket.
7. Install the water pump. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system-h4so-except-sti__installation) , Water Pump. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system-h4dotc-except-sti__installation) , Water Pump.
8. Install the crankshaft position sensor. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/fuel-system/#fuel-injection-system-h4so-except-sti) , Crankshaft Position Sensor. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/fuel-system/#fuel-injection-system-h4dotc) , Crankshaft Position Sensor.
9. Install the radiator. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system-h4so-except-sti) , Radiator. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/cooling-system-mechanical/#engine-cooling-system-h4dotc-except-sti) , Radiator.
10. Connect the ground cable to battery.

DISASSEMBLY

Remove the screw which secures oil pump cover and then disassemble oil pump. Inscribe alignment marks on the inner and outer rotors so that they can be replaced in their original positions during reassembly.

Note. Before disassembling the oil pump, remove the relief valve.

Scheme 68

ASSEMBLY

1. Using the ST, install the front oil seal. ST 499587100 OIL SEAL INSTALLER NOTE: Use a new front oil seal.
2. Apply a coat of engine oil to inner and outer rotors.
3. Install the inner and outer rotors.
4. Assemble the oil relief valve and install relief valve spring and plug. NOTE: Use a new gasket.
5. Install the oil pump cover.

Tightening torque

T1: 5.4 N.m (0.6 kgf-m, 4.0 ft-lb)

T2: 44 N.m (4.5 kgf-m, 32.5 ft-lb)

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TIP CLEARANCE

Measure the tip clearance of rotors. If the clearance is out of specification, replace the rotors as a set.

Tip clearance

Standard

0.04 - 0.14 mm (0.0016 - 0.0055 in)

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CASE CLEARANCE

Measure the clearance between the outer rotor and the oil pump case. If clearance is out of standard, replace the oil pump case.

Case clearance

Standard

0.10 - 0.175 mm (0.0039 - 0.0069 in)

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SIDE CLEARANCE

Measure the gap between the inner rotor and the oil pump case to measure the clearance between the oil pump inner rotor and the oil pump cover as shown in the figure. If clearance is out of standard, replace the rotor or the oil pump case.

Side clearance

Specification

0.02 - 0.07 mm (0.0008 - 0.0028 in)

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OIL RELIEF VALVE

Check the valve for assembly condition and damage, and the relief valve spring for damage and deterioration.

Replace the parts if defective.

Relief valve spring

Free length

73.7 mm (2.902 in)

Installed length

54.7 mm (2.154 in)

Load when installed

93.1N (9.49 kgf, 20.88 lbf)

OIL PUMP CASE

Check the oil pump case for worn shaft hole, clogged oil passage, worn rotor chamber, cracks and other faults.

FRONT OIL SEAL

Check the front oil seal lips for deformation, hardening, wear, etc. and replace if defective.

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1. Set the vehicle on a lift.
2. Disconnect the ground cable from battery.
3. Remove the air intake duct. Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/mechanical/#engine-intake-system-h4so-except-sti) , Air Intake Duct. Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/mechanical/#engine-intake-system-h4dotc-except-sti) , Air Intake Duct.
4. Disconnect the connectors from the mass air flow and intake air temperature sensor. (Non-turbo model)
5. Remove the air intake chamber. (Non-turbo model) Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/mechanical/#engine-intake-system-h4so-except-sti) , Air Intake Chamber.
6. Remove the air intake boot. (Turbo model)
7. Remove the intercooler. (Turbo model) Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/mechanical/#engine-intake-system-h4dotc-except-sti) , Intercooler.
8. Remove the pitching stopper.
9. Remove the radiator upper brackets.
10. Support the engine with a lifting device and wire ropes.
11. Lift up the vehicle. CAUTION: When lifting up the vehicle, raise up wire ropes at the same time.
12. Remove the under cover.
13. Drain the engine oil. Refer to «REPLACEMENT»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/lubrication-system/#engine-lubrication-system-h4so-except-sti__replacement) , Engine Oil.
14. Remove the front exhaust pipe. Refer to «REMOVAL (H4SO)»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/exhaust/#exhaust-system-h4so-except-sti__removal) or «REMOVAL (H4DOTC)»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/exhaust/#exhaust-system-exhaust-h4dotc-except-sti__removal) .
15. Remove the nuts which secure the engine mounting to the front crossmember.
16. Remove the bolts which secure oil pan on cylinder block with the engine raised up.
17. Insert an oil pan cutter blade between cylinder block-to-oil pan clearance and remove the oil pan. CAUTION: Do not use a screwdriver or similar tool in place of oil pan cutter.
18. Remove the oil strainer.
19. Remove the baffle plate.

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INSTALLATION

Note. Before installing the oil pan, clean the mating surface of oil pan and engine block.

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1. Make sure that the seals (A) are installed securely on the baffle plate in a direction as shown in the figure below. NOTE: Use a new seal.
2. Install the baffle plate. Tightening torque: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb)
3. Install the oil strainer to cylinder block. NOTE: Use new O-rings. Tightening torque: 10 N.m (1.0 kgf-m, 7.4 ft-lb)
4. Tighten the oil strainer stay together with the baffle plate. Tightening torque: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb)
5. Apply liquid gasket to the mating surfaces of oil pan, and install the oil pan. NOTE: Use a new gasket. Install within 5 min. after applying liquid gasket. Liquid gasket: THREE BOND 1217G (Part No. K0877Y0100) or equivalent
6. Tighten the bolts which install oil pan to cylinder block. Tightening torque: T1:5 N.m (0.5 kgf-m, 3.7 ft-lb) T2: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb) T3: 10 N.m (1.0 kgf-m, 7.4 ft-lb)
7. Lower the engine onto front crossmember.
8. Tighten the nuts which install engine mounting onto front crossmember. NOTE: Make sure that the engine mounting nuts (A) and locator (B) are securely installed. (Turbo model) Tightening torque: 85 N.m (8.7 kgf-m, 62.7 ft-lb) Non-turbo model Turbo model
9. Install the front exhaust pipe. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/exhaust/#exhaust-system-h4so-except-sti__installation) , Front Exhaust Pipe. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/exhaust/#exhaust-system-exhaust-h4dotc-except-sti__installation) , Front Exhaust Pipe.
10. Install the undercover.
11. Lower the vehicle. CAUTION: When lowering the vehicle, lower the lift up device and wire ropes at the same time.
12. Remove the lifting device and wire ropes.
13. Install the pitching stopper. Tightening torque: T1: 50 N.m (5.1 kgf-m, 36.9 ft-lb) T2: 58 N.m (5.9 kgf-m, 42.8 ft-lb)
14. Install the radiator upper brackets. Tightening torque: 12 N.m (1.2 kgf-m, 8.9 ft-lb)
15. Install the intercooler. (Turbo model) Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/mechanical/#engine-intake-system-h4dotc-except-sti) , Intercooler.
16. Install the air intake boot. (Turbo model)
17. Install the air intake chamber. (Non-turbo model) Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/mechanical/#engine-intake-system-h4so-except-sti) , Air Intake Chamber.
18. Install the air intake duct. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/mechanical/#engine-intake-system-h4so-except-sti) , Air Intake Duct. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/mechanical/#engine-intake-system-h4dotc-except-sti) , Air Intake Duct.
19. Connect the connector to the mass air flow and intake air temperature sensor. (Non-turbo model)
20. Connect the ground cable to battery.
21. Refill the engine oil. Refer to «INSPECTION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/lubrication-system/#engine-lubrication-system-h4so-except-sti) , Engine Oil.

Visually check that the oil pan, oil strainer and baffle plate are not damaged.

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1. Disconnect the ground cable from battery.
2. Remove the generator from the bracket. Refer to «REMOVAL»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/charging-system/#starting-system-charging-system-h4so-except-sti) , Generator.
3. Disconnect the terminal from oil pressure switch.
4. Remove the oil pressure switch.

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1. Apply liquid gasket to the oil pressure switch threads. Liquid gasket: THREE BOND 1324 (Part No. 004403042) or equivalent
2. Install the oil pressure switch to cylinder block. Tightening torque: 25 N.m (2.5 kgf-m, 18.4 ft-lb)
3. Connect the terminal to the oil pressure switch.
4. Install the generator to the bracket. Refer to «INSTALLATION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/charging-system/#starting-system-charging-system-h4so-except-sti) , Generator.
5. Connect the ground cable to battery.

Check the oil pressure switch installation portion for oil leakage and oil seepage.

REMOVAL

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1. Set the vehicle on a lift.
2. Lift up the vehicle.
3. Remove the under cover. (Turbo model)
4. Remove the oil filter. Oil filter (Black) Remove using the ST. ST 18332AA000 OIL FILTER WRENCH (outer diameter: 68 mm (2.68 in) for oil filter) Oil filter (Blue) Remove using a general tool (65/67 mm 14 Flutes). Non-turbo model Turbo model

1. Clean the oil filter installing surface of cylinder block.
2. Obtain a new oil filter and apply a thin coat of engine oil to the seal rubber.
3. Install the oil filter turning it by hand, being careful not to damage the seal rubber of the oil filter. Tighten the oil filter (Black) with an outer diameter of 68 mm (2.68 in) (approx. 1 rotation) after the seal rubber of the oil filter comes in contact with cylinder block. When using a torque wrench, tighten to 14 N.m (1.4 kgf-m, 10.3 ft-lb). Tighten the oil filter (Blue) with an outer diameter of 67.4 mm (2.65 in) (approx. 7/8 rotation) after the seal rubber of the oil filter comes in contact with cylinder block. When using a torque wrench, tighten to 12 N.m (1.2 kgf-m, 8.9 ft-lb).
4. Install the under cover. (Turbo model)
5. Lower the vehicle.

1. After installing the oil filter, run the engine and make sure that no oil is leaking around seal rubber. NOTE: The filter element and filter case are permanently jointed; therefore, interior cleaning is not necessary.
2. Check the engine oil level. Refer to «INSPECTION»(/subaru/impreza-wrx-sti/gr-2007-2011/remont/lubrication-system/#engine-lubrication-system-h4so-except-sti) , Engine Oil.

Before performing diagnostics, make sure that the engine oil level is correct and no oil leakage exists.

ENGINE LUBRICATION SYSTEM TROUBLE CHART

See also:
• INSPECTION
• REMOVAL
• REMOVAL
• REMOVAL
• REMOVAL
• REMOVAL
• REMOVAL
• REMOVAL
• REMOVAL
• INSTALLATION
• INSTALLATION
• REMOVAL
• REMOVAL
• REMOVAL (H4SO)
• REMOVAL (H4DOTC)
• INSTALLATION
• INSTALLATION
• REMOVAL
• SPECIFICATION
• REPLACEMENT
• INSPECTION