Subaru Legacy IV (2008 year). Service manual — part 500
CO(H6DO)-26
Engine Cooling System Trouble in General
COOLING
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 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
Replace engine coolant. If ineffective, check, repair or
replace engine components.
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. Dragging brake
Adjust.
l. Defective radiator fan
Inspect the radiator fan relay, engine coolant tempera-
ture 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
Repair or replace.
b. Leakage from water pump
Replace.
c. Leakage from water pipe
Repair or replace.
d. Leakage around cylinder head gasket
Retighten cylinder head bolts or replace gasket.
e. Damaged or cracked cylinder head and cylinder
block
Repair or replace.
f. Damaged or cracked thermostat cover
Repair or replace.
g. Leakage from radiator
Repair or replace.
Noise
a. Defective radiator fan
Replace.
b. Defective water pump bearing
Replace water pump.
c. Mechanical water pump malfunction
Replace water pump.
LU(H6DO)-2
General Description
LUBRICATION
1. General Description
A: SPECIFICATION
Recommended oil:
Oil corresponding to either of the following
standards.
• For API standard, oil with SM “Energy Con-
serving” logo
• For ILSAC standard, oil with GF-4 “Star burst
mark” label on the container
CAUTION:
It is acceptable to fill an engine with oil of an-
other brand when replacing the oil, but make
sure to use an oil with an API standard and SAE
viscosity number specified by Subaru.
NOTE:
• The proper viscosity oil helps the engine main-
tain its ideal temperature, and cranking speed in-
creased by reducing viscosity friction in hot
condition.
• If the vehicle is used in regions of high tempera-
tures or in other severe environments, use oil with
the viscosities shown below.
API standard: SM or SL
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 (kg/cm
2
, psi)
160 (1.63, 23.2)
Outer diameter × width
mm (in)
80 × 75 (3.15 × 2.95)
Installation screw specifications
M 20 × 1.5
Relief valve working pressure
kPa (kg/cm
2
, psi)
708 (7.22, 102.7)
Oil pressure
switch
Type
Immersed contact point type
Operating voltage — power consumption
12 V — 3.4 W or less
Warning light operating pressure
kPa (kg/cm
2
, psi)
15 (0.15, 2.2)
Proof pressure
kPa (kg/cm
2
, psi)
980 (10.0, 142) or more
Engine oil
Total capacity (Overhaul)
2 (US qt, Imp qt)
7.0 (7.4, 6.2)
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
( C)
-30 -20 -15
0
15
30
40
-22
-4
5
32
59
86 104
SAE (1)
( F)
10W-30, 10W-40 , 10W-50
5W-30 (2)
LU-02329
LU(H6DO)-3
General Description
LUBRICATION
B: COMPONENT
(4)
(3)
T8
(26)
(16)
(20)
(2)
(17)
(13)
(7)
(9)
(6)
(7)
(14)
(18)
(1)
(21)
(19)
(25)
(24)
(23)
T1
T4
T4
T1
T4
T7
T6
T4
T5
T3
T8
T10
(26)
(8)
(11)
(10)
T9
(12)
T2
(15)
(26)
(22)
(5)
(6)
(7)
(7)
(7)
(7)
T1
(6)
LU-02368
LU(H6DO)-4
General Description
LUBRICATION
(1)
Oil pan lower
(14)
Outer rotor
Tightening torque:N·m (kgf-m, ft-lb)
(2)
Magnet
(15)
Crank sprocket
T1: 6.4 (0.7, 4.7)
(3)
Drain plug
(16)
Oil pan upper
T2: <Ref. to LU(H6DO)-9, INSTAL-
LATION, Oil Pump.>
(4)
Gasket
(17)
Plug
(5)
Engine oil cooler water pipe
(18)
Plug
T3: 16 (1.6, 11.8)
(6)
Water hose
(19)
Plug
T4: 18 (1.8, 13.3)
(7)
Clip
(20)
Oil pressure switch
T5: 23 (2.3, 17.0)
(8)
Gasket
(21)
Plug
T6: 25 (2.5, 18.4)
(9)
Oil cooler
(22)
Oil strainer
T7: 37 (3.8, 27.3)
(10)
Oil cooler connector
(23)
Plug
T8: 44 (4.5, 32.5)
(11)
Oil filter
(24)
Relief valve spring
T9: 54 (5.5, 39.8)
(12)
Oil pump cover
(25)
Relief valve
T10: 90 (9.2, 66.4)
(13)
Inner rotor
(26)
O-ring
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