Subaru Legacy (2005 year). Manual — part 414

CO(H6DO)-27

COOLING

Engine Cooling System Trouble in General

12.Engine Cooling System Trouble in General

A: INSPECTION

Trouble

Possible cause

Corrective action

Overheating

a. Insufficient engine coolant

Replenish engine coolant, inspect for leakage, and
repair it if necessary.

b. Defective thermostat

Replace.

c. Malfunction of water pump

Replace.

d. Clogged engine coolant passage

Clean.

e. Improper ignition timing

Inspect and repair the ignition control system. <Ref. to
EN(H6DO)(diag)-2, PROCEDURE, Basic Diagnostic
Procedure.>

f. Clogged or leaking radiator

Clean, repair or replace.

g. Improper engine oil in engine coolant

Check, repair or replace the parts around engine.

h. Air/fuel mixture ratio too lean

Inspect and repair the fuel injection system. <Ref. to
EN(H6DO)(diag)-2, PROCEDURE, Basic Diagnostic
Procedure.>

i. Excessive back pressure in exhaust system

Clean or replace.

j. Insufficient clearance between piston and cylinder

Adjust or replace.

k. Slipping clutch

Correct or replace.

l. Dragging brake

Adjust.

m. Faulty transmission gear oil

Replace.

n. Malfunction of radiator fan

Inspect radiator fan relay, engine coolant temperature
sensor or fan motor and replace them.

Over-cooling

a. Ambient temperature extremely low

Partly cover radiator front area.

b. Defective thermostat

Replace.

Engine coolant
leaks

a. Loosened or damaged connecting units on hoses

Correct or replace.

b. Leakage from water pump

Replace.

c. Leakage from water pipe

Correct or replace.

d. Leakage around cylinder head gasket

Retighten cylinder head bolts or replace gasket.

e. Damaged or cracked cylinder head and crankcase Correct or replace.

f. Damaged or cracked thermostat case

Correct or replace.

g. Leakage from radiator

Correct or replace.

Noise

a. Defective drive belt

Replace.

b. Defective radiator fan

Replace.

c. Defective water pump bearing

Replace water pump.

d. Defective water pump mechanical seal

Replace water pump.

CO(H6DO)-28

COOLING

Engine Cooling System Trouble in General

LUBRICATION

LU(H6DO)

Page

1.

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

2.

Oil Pressure System . . . . . . . . . . . . . . . . . . . . ...5

3.

Engine Oil. . . . . . . . . . . . . . . . . . . . . . . . . 7

4.

Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . .8

5.

Oil Pump Relief Valve . . . . . . . . . . . . . . . . . . . ...10

6.

Oil Pan and Strainer. . . . . . . . . . . . . . . . . . . . ..11

7.

Oil Pressure Switch. . . . . . . . . . . . . . . . . . . . ...13

8.

Engine Oil Filter. . . . . . . . . . . . . . . . . . . . . . .14

9.

Engine Oil Cooler . . . . . . . . . . . . . . . . . . . . . ..15

10.

Engine Lubrication System Trouble in General. . . . . . . . . . .17

LU(H6DO)-2

LUBRICATION

General Description

1. General Description

A: SPECIFICATION

Recommended oil

For the API standard SL and SJ, use the logo
mark with “Energy Conserving” (If the SL, SJ
grade is not available, use SH grade).
ACEA standard A1, A2 or A3
ILSAC standard GF-3 “Star burst mark” label
on the container

CAUTION:
When replenishing oil, it does not matter if the
oil to be added is a different brand from that in
the engine; however, use oil having the API
standard and SAE viscosity No. designated by
SUBARU.

NOTE:
If the vehicle is used in areas with very high temper-
atures or for other heavy duty applications, the fol-
lowing viscosity oils must be used: API standard:
SL or SJ
SAE viscosity No.: 30, 40, 10W-50, 20W-40, 20W-
50

Lubrication method

Forced lubrication

Oil Pump

Pump type

Trochoid type

Number of teeth

Inner rotor

7

Outer rotor

8

Outer rotor diameter

× thickness

mm (in)

86

× 13 (3.39 × 0.51)

Tip clearance between inner and outer rotors

mm (in)

0.04 — 0.14 (0.0016 — 0.0055)

Side clearance between inner rotor and pump case

mm (in)

0.020 — 0.046 (0.0008 — 0.0018)

Case clearance between outer rotor and pump case

mm (in)

0.110 — 0.175 (0.0043 — 0.0069)

Oil filter

Filter type

Full-flow filter type

Filtration area

cm

2

(sq in)

1,300 (201.5)

By-pass valve opening pressure

kPa (kgf/cm

2

, psi)

160 (1.63, 23.2)

Outer diameter

× width

mm (in)

80

× 75 (3.15 × 2.95)

Installation screw specifications

M20

× 1.5

Relief valve working pressure

kPa (kgf/cm

2

, psi)

708 (7.2, 102.7)

Oil pressure
switch

Type

Immersed contact point type

Working voltage — wattage

12 V — 3.4 W or less

Warning light activation pressure

kPa (kgf/cm

2

, psi)

15 (0.15, 2.2)

Proof pressure

kPa (kgf/cm

2

, psi)

980 (10.0, 142) or more

Engine oil

Capacity (at overhaul)

2 (US qt, Imp qt)

7.2 (7.6, 6.3)

When replacing engine oil and oil filter

2 (US qt, Imp qt)

5.7 (6.0, 5.0)

When replacing engine oil only

2 (US qt, Imp qt)

5.5 (5.8, 4.8)

(1) SAE viscosity No. and applicable temperature

(2) Recommended

LU-02149

( C)

-30 -20 -15

0

15

30

40

-22

-4

5

32

59

86 104

SAE (1)

( F)

5W-30 (2)

10W-30, 10W-40