Subaru Legacy III (2000-2003 year). Manual - part 450

LU(H4DOSTC)-20

LUBRICATION

ENGINE OIL COOLER

B: INSTALLATION

1) Install in the reverse order of removal.

Tightening torque:

T: 54 N·m (5.5 kgf-m, 40 ft-lb)

CAUTION:
Always use a new O-ring.

C: INSPECTION

1) Check that the coolant passages are not
clogged using an air blow method. 
2) Check the mating surfaces of cylinder block, O-
ring groove and oil filter for damage.

LU-00156

T

LU(H4DOSTC)-21

LUBRICATION

ENGINE OIL FILTER

8. Engine Oil Filter

A: REMOVAL

1) Remove under cover.
2) Remove oil filter with ST.
ST

498547000

OIL FILTER WRENCH

B: INSTALLATION

1) Get a new oil filter and thinly apply engine oil to
the seal rubber.
2) Install oil filter by turning it by hand, being careful
not to damage seal rubber.
3) Tighten more (approximately 2/3 to 3/4 turn) af-
ter the seal rubber contacts the oil pump case. Do
not tighten excessively, or oil may leak.

C: INSPECTION

1) After installing oil filter, run engine and make
sure that no oil is leaking around seal rubber.

NOTE:
The filter element and filter case are integrated
therefore, interior cleaning is not necessary.
2) Check the engine oil level. <Ref. to
LU(H4DOSTC)-8, INSPECTION, Engine Oil.>z

LU-00157

LU(H4DOSTC)-22

LUBRICATION

ENGINE LUBRICATION SYSTEM TROUBLE IN GENERAL

9. 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.

Trouble

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

Clogged oil filter

Replace.

Malfunction of oil by-pass valve of oil filter

Clean or replace.

Malfunction of oil relief valve of 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

Replenish.

Broken pipe of oil strainer

Replace.

Stuck oil pump rotor

Replace.

2. Warning light does 
not go on.

1) Burn-out bulb

Replace.

2) Poor contact of 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).

SPEED CONTROL SYSTEMS

SP(H4DOSTC)

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General Description ....................................................................................2