Subaru Legacy IV (2008 year). Manual - part 504

LU(H6DO)-17

Oil Cooler

LUBRICATION

9. Oil Cooler

A: REMOVAL

CAUTION:
If the engine oil is spilt over exhaust pipe or the
under cover, wipe it off with cloth to avoid emit-
ting smoke or causing a fire.
1) Set the vehicle on a lift.
2) Lift up the vehicle.
3) Remove the under cover.
4) Drain engine coolant. <Ref. to CO(H6DO)-10,
DRAINING OF ENGINE COOLANT, REPLACE-
MENT, Engine Coolant.>
5) Drain the engine oil. <Ref. to LU(H6DO)-8, RE-
PLACEMENT, Engine Oil.>
6) Remove the bolts which hold the engine oil cool-
er water pipe to engine.

7) Disconnect the water hose from oil cooler.

8) Remove the oil filter using the ST. <Ref. to
LU(H6DO)-16, REMOVAL, Engine Oil Filter.>

9) Remove the oil cooler connector and remove the
oil cooler.

LU-02128

LU-02129

(A) Oil cooler connector

(B) Oil cooler

(C) Gasket

LU-02130

(A)

(B)

(C)

LU(H6DO)-18

Oil Cooler

LUBRICATION

B: INSTALLATION

1) Install the oil cooler to oil pan upper with oil cool-
er connector.

NOTE:
Use a new gasket.

Tightening torque:

T: 54 N·m (5.5 kgf-m, 39.8 ft-lb)

2) Install the oil filter. <Ref. to LU(H6DO)-16, IN-
STALLATION, Engine Oil Filter.>
3) Connect the water hose.

4) Install the engine oil cooler water pipe onto en-
gine.

Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

5) Lower the vehicle.
6) Refill the engine oil. <Ref. to LU(H6DO)-8, RE-
PLACEMENT, Engine Oil.>

7) Fill engine coolant. <Ref. to CO(H6DO)-10,
FILLING OF ENGINE COOLANT, REPLACE-
MENT, Engine Coolant.>
8) Check the engine oil level. <Ref. to LU(H6DO)-
8, INSPECTION, Engine Oil.>

C: INSPECTION

1) Check that coolant passages are not clogged
using an compressed air.
2) Check that the oil pan upper and O-ring installing
surface of oil filter are not damaged.

(A) Oil cooler connector

(B) Oil cooler

(C) Gasket

LU-02131

(A)

(B)

(C)

T

LU-02129

LU-02128

LU(H6DO)-19

Engine Lubrication System Trouble in General

LUBRICATION

10.Engine Lubrication System Trouble in General

A: INSPECTION

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

Symptom

Possible cause

Corrective action

1. Warning light remains 
on.

1) Oil pressure switch 
failure

Cracked diaphragm or oil leakage within switch

Replace.

Broken spring or seized contacts

Replace.

2) Low oil pressure

Clogging of oil filter

Replace.

Malfunction of oil by-pass valve in oil filter

Clean or replace.

Malfunction of oil relief valve in oil pump

Clean or replace.

Clogged oil passage

Clean.

Excessive tip clearance and side clearance of oil 
pump rotor and gear

Replace.

Clogged oil strainer or broken pipe

Clean or replace.

3) No oil pressure

Insufficient engine oil (including deterioration)

Replace.

Broken pipe of oil strainer

Replace.

Stuck oil pump rotor

Replace.

2. Warning light does 
not turn on.

1) Malfunction of combination meter

Replace.

2) Poor contact of switch contact points

Replace.

3) Disconnection of wiring

Repair.

3. Warning light flickers 
momentarily.

1) Poor contact of terminals

Repair.

2) Defective wiring harness

Repair.

3) Low oil pressure

Check for the same 
possible causes as 
listed 1. — 2).

LU(H6DO)-20

Engine Lubrication System Trouble in General

LUBRICATION