Subaru Legacy (2005 year). Manual - part 418

LU(H6DO)-15

LUBRICATION

Engine Oil Cooler

9. Engine Oil Cooler

A: REMOVAL

1) Lift-up the vehicle.
2) Remove the under cover.
3) Drain the engine coolant.
<Ref. to CO(H6DO)-11, DRAINING OF ENGINE
COOLANT, REPLACEMENT, Engine Coolant.>
4) Drain the engine oil. <Ref. to LU(H6DO)-7, RE-
PLACEMENT, Engine Oil.>
5) Remove the bolts which hold water pipe to en-
gine.

6) Disconnect the water hose from oil cooler.

7) Remove the oil filter using ST. <Ref. to
LU(H6DO)-14, REMOVAL, Engine Oil Filter.>
ST

498547000

OIL FILTER WRENCH

NOTE:
Set a container under the vehicle.

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

B: INSTALLATION

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

Tightening torque:

T: 54 N

⋅

m (5.5 kgf-m, 40 ft-lb)

NOTE:
Use a new O-ring.

2) Install the oil filter. <Ref. to LU(H6DO)-14, IN-
STALLATION, Engine Oil Filter.>

LU-02036

LU-02037

LU-00134

(A) Oil cooler connector

(B) Oil cooler

(C) O-ring

(A) Oil cooler connector

(B) Oil cooler

(C) O-ring

(A)

(B)

(C)

LU-02130

(A)

(B)

(C)

T

LU-02131

LU-00134

LU(H6DO)-16

LUBRICATION

Engine Oil Cooler

3) Connect the water hose.

4) Install the water pipe onto engine.

Tightening torque:

6.4 N

⋅

m (0.65 kgf-m, 4.7 ft-lb)

5) Fill engine oil. <Ref. to LU(H6DO)-7, REPLACE-
MENT, Engine Oil.>
6) Fill engine coolant. <Ref. to CO(H6DO)-11,
FILLING OF ENGINE COOLANT, REPLACE-
MENT, Engine Coolant.>
7) Check the engine oil level. <Ref. to LU(H6DO)-
7, INSPECTION, Engine Oil.>

C: INSPECTION

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

LU-02037

LU-02036

LU(H6DO)-17

LUBRICATION

Engine Lubrication System Trouble in General

10.Engine Lubrication System Trouble in General

A: INSPECTION

Before performing diagnosis, 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 
between oil pump rotor and gear

Replace.

Clogged oil strainer or broken pipe

Clean or replace.

3) No oil pressure

Insufficient engine oil amount

Replenish.

Broken pipe of oil strainer

Replace.

Stuck oil pump rotor

Replace.

2. Warning light does 
not come on.

1) Malfunction of combination meter

Replace.

2) Poor contact in switch contact points

Replace.

3) Disconnection of wiring

Repair.

3. Warning light flickers 
momentarily.

1) Poor contact at terminals

Repair.

2) Defective wiring harness

Repair.

3) Low oil pressure

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

LU(H6DO)-18

LUBRICATION

Engine Lubrication System Trouble in General