Subaru Legacy (2005 year). Service 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
General Description . . . . . . . . . . . . . . . . . . . . . 2
Oil Pressure System . . . . . . . . . . . . . . . . . . . . ...5
Engine Oil. . . . . . . . . . . . . . . . . . . . . . . . . 7
Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . .8
Oil Pump Relief Valve . . . . . . . . . . . . . . . . . . . ...10
Oil Pan and Strainer. . . . . . . . . . . . . . . . . . . . ..11
Oil Pressure Switch. . . . . . . . . . . . . . . . . . . . ...13
Engine Oil Filter. . . . . . . . . . . . . . . . . . . . . . .14
Engine Oil Cooler . . . . . . . . . . . . . . . . . . . . . ..15
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
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