Engine Intake System - Intake (Induction) (H4DOTC): Diagnosis Subaru Forester SH

INSPECTION

Replace if excessively damaged or dirty.

Scheme 39

Scheme 40

1. Remove the collector cover.
2. Disconnect the ground cable from the battery.
3. Remove the air intake duct (rear). Refer to «REMOVAL»(ref-325300-S04200539772009071800000) , Air Intake Duct .
4. Disconnect the connector (A) from mass air flow and intake air temperature sensor.
5. Loosen the clamp (B) which connects the air intake boot and intake duct.
6. Remove the clip (C) from the air cleaner case.
7. Remove the air cleaner case (rear) and air intake boot.
8. Remove the air cleaner element.
9. Remove the bolts (A) and nuts (B) which secure the air cleaner case (front) to the body.
10. Remove the air cleaner case (front).

Check for cracks or loose connections.

Scheme 41

1. Remove the clip which installs the air intake duct (rear) on the front side of body.
2. Remove the air intake duct (rear).
3. Remove the clip (A) and four claws and then remove the air intake duct (front).

Scheme 42

1. Check for cracks or clip damage.
2. Inspect that no foreign objects in the air intake duct.

Check for cracks or loose connections.

Scheme 43

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Scheme 48

1. Set the vehicle on a lift.
2. Remove the collector cover.
3. Disconnect the ground cable from the battery.
4. Lift up the vehicle.
5. Drain approximately 3.0 l (3.2 US qt, 2.6 lmp qt) of coolant. Refer to «DRAINING OF ENGINE COOLANT»(ref-325304-S01033522502009071800000) , REPLACEMENT, Engine Coolant .
6. Lower the vehicle.
7. Remove the intercooler. Refer to «REMOVAL»(ref-325300-S41039960822009071800000) , Intercooler .
8. Remove the center exhaust pipe. Refer to «REMOVAL»(ref-325336-S28652404252009071800000) , Center Exhaust Pipe .
9. Lower the vehicle.
10. Separate the turbocharger joint pipe from turbocharger.
11. Disconnect the engine coolant hose which is connected to coolant filler tank.
12. Disconnect the air control hose (A), and loosen the clamp that holds the turbocharger on the intake duct.
13. Remove the oil inlet pipe from the turbocharger.
14. Disconnect the engine coolant hose from the water pipe.
15. Disconnect the oil outlet hose from the oil outlet pipe.
16. Take out the turbocharger from engine compartment.
17. Remove the turbocharger stay.

Scheme 49

Scheme 50

Scheme 51

1. Install the turbocharger stay. Tightening torque: T1: 33 N.m (3.4 kgf-m, 24.3 ft-lb) T2: 42.5 N.m (4.3 kgf-m, 31.3 ft-lb)
2. Connect the oil outlet hose to the oil outlet pipe.
3. Connect the engine coolant hoses to the water pipe.
4. Install the oil inlet pipe to the turbocharger. Tightening torque: T1: 5 N.m (0.5 kgf-m, 3.7 ft-lb) T2: 16 N.m (1.6 kgf-m, 11.8 ft-lb) T3: 20 N.m (2.0 kgf-m, 14.5 ft-lb)
5. Connect the air control hose (A), and install the turbocharger to the intake duct. Tightening torque: 3 N.m (0.3 kgf-m, 2.2 ft-lb)
6. Connect the engine coolant hose which is connected to the coolant filler tank.
7. Install the joint pipe to turbocharger. NOTE: Replace the gasket with a new part. Tightening torque: 42.5 N.m (4.3 kgf-m, 31.3 ft-lb)
8. Lift up the vehicle.
9. Install the center exhaust pipe. Refer to «INSTALLATION»(ref-325336-S00612259482009071800000) , Center Exhaust Pipe .
10. Lower the vehicle.
11. Install the intercooler. Refer to «INSTALLATION»(ref-325300-S37233999532009071800000) , Intercooler .
12. Fill engine coolant. Refer to «FILLING OF ENGINE COOLANT»(ref-325304-S22895877052009071800000) , REPLACEMENT, Engine Coolant .
13. Connect the ground cable to battery.
14. Install the collector cover.

Scheme 52

Scheme 53

1. Remove the collector cover.
2. Remove the intercooler. Refer to «REMOVAL»(ref-325300-S41039960822009071800000) , Intercooler .
3. Remove the turbocharger upper cover.
4. Remove the boost hose (B) from the waste gate actuator (A) of the turbo charger, and connect the Mighty Vac to the waste gate actuator (A).
5. Pressurize slowly with the Mighty Vac, and measure the pressure when the control rod stroke (D) becomes 1 mm (0.04 in). If it is not within the standard, replace the turbocharger assembly. CAUTION: Do not pressurize over 56.0 kPa (0.57 kgf/cm 2 , 8.12 psi) to prevent damaging the waste gate actuator. Control pressure (Control rod stroke 1 mm (0.04 in)): Standard value 44.0 - 46.6 kPa (0.45 - 0.48 kgf/cm 2 , 6.38 - 6.76 psi)
6. After inspection, install the related parts in the reverse order of removal.

Tightening torque

7.5 N.m (0.8 kgf-m, 5.5 ft-lb)

Check for cracks or loose connections.