Engine Lubrication System (H4SO) (Except Sti): Other Subaru Impreza GH

COMPONENT

1. Non-turbo model

Scheme 77

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 78

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.

GENERAL TOOL

GENERAL TOOL DESCRIPTION

Scheme 79

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)

Scheme 80

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)

Scheme 81

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)

Scheme 82

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.

Scheme 83

Scheme 84

Scheme 85

Scheme 86

Scheme 87

1. Set the vehicle on a lift.
2. Disconnect the ground cable from battery.
3. Remove the air intake duct. Refer to «REMOVAL»(ref-357233-S32244127582010031100000) , Air Intake Duct. Refer to «REMOVAL»(ref-357235-S10313590332010031100000) , 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»(ref-357233-S01318946012010031100000) , Air Intake Chamber.
6. Remove the air intake boot. (Turbo model)
7. Remove the intercooler. (Turbo model) Refer to «REMOVAL»(ref-357235-S29312200482010031100000) , 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»(ref-357256-S30004635462010031100000) , Engine Oil.
14. Remove the front exhaust pipe. Refer to «REMOVAL (H4SO)»(ref-357254-S15303422132010031100000) or «REMOVAL (H4DOTC)»(ref-357260-S13721512082010031100000) .
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.

Scheme 88