Subaru Legacy (2005 year). Service manual — part 300
CO(H4DOTC)-31
COOLING
Coolant Filler Tank
11.Coolant Filler Tank
A: REMOVAL
WARNING:
The radiator is pressurized. Wait until engine
cools down before working on the radiator.
1) Remove the collector cover.
2) Drain the coolant about 3.0
2 (3.2 US qt, 2.6
Imp qt). <Ref. to CO(H4DOTC)-13, DRAINING OF
ENGINE COOLANT, REPLACEMENT, Engine
Coolant.>
3) Disconnect the engine coolant hoses from cool-
ant filler tank.
4) Remove the bolts which install the coolant filler
tank.
5) Disconnect the engine coolant hose which con-
nects the under side of coolant filler tank.
6) Remove the coolant filler tank.
B: INSTALLATION
1) Install in the reverse order of removal.
Tightening torque:
16 N
⋅
m (1.6 kgf-m, 11.8 ft-lb)
2) Fill with engine coolant. <Ref. to CO(H4DOTC)-
13, FILLING OF ENGINE COOLANT, REPLACE-
MENT, Engine Coolant.>
CO-00264
CO-00264
CO(H4DOTC)-32
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. Loose timing belt
Repair or replace timing belt tensioner.
c. Oil on drive belt
Replace.
d. Malfunction of thermostat
Replace.
e. Malfunction of water pump
Replace.
f. Clogged engine coolant passage
Clean.
g. Improper ignition timing
Inspect and repair ignition control system. <Ref. to
EN(H4DOTC)(diag)-2, PROCEDURE, Basic Diagnostic
Procedure.>
h. Clogged or leaking radiator
Clean, repair or replace.
i. Engine oil mixed in engine coolant
Check, repair or replace the parts around engine.
j. Air/fuel mixture ratio too lean
Inspect and repair the fuel injection system. <Ref. to
EN(H4DOTC)(diag)-2, PROCEDURE, Basic Diagnostic
Procedure.>
k. Excessive back pressure in exhaust system
Clean or replace.
l. Insufficient clearance between piston and cylinder
Adjust or replace.
m. Slipping clutch
Correct or replace.
n. Dragging brake
Adjust.
o. Defective 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.
LUBRICATION
LU(H4DOTC)
Page
General Description . . . . . . . . . . . . . . . . . . . . . 2
Oil Pressure System . . . . . . . . . . . . . . . . . . . . ...7
Engine Oil. . . . . . . . . . . . . . . . . . . . . . . . . 9
Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . ...10
Oil Pan and Strainer. . . . . . . . . . . . . . . . . . . . ..14
Oil Pressure Switch. . . . . . . . . . . . . . . . . . . . ...17
Engine Oil Filter. . . . . . . . . . . . . . . . . . . . . . .18
Engine Oil Cooler . . . . . . . . . . . . . . . . . . . . . ..19
Engine Lubrication System Trouble in General. . . . . . . . . . .20
LU(H4DOTC)-2
LUBRICATION
General Description
1. General Description
A: SPECIFICATION
Lubrication method
Forced lubrication
Oil pump
Pump type
Trochoid type
Number of teeth
Inner rotor
9
Outer rotor
10
Outer rotor diameter
× thickness
mm (in)
78
× 12 (3.07 × 0.47)
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)
0.02 — 0.07 (0.0008 — 0.0028)
Case clearance between outer rotor
and pump case
Specifica-
tion
mm (in)
0.10 — 0.175 (0.0039 — 0.0069)
Performance
at oil temperature 80
°C
(176
°F)
600 rpm
Discharge
pressure
kPa (kgf/cm
2
, psi)
98 (1.0, 14)
Discharge
rate
2 (US qt, Imp
qt)/min.
6.5 (6.9, 5.7) or more
6,000 rpm
Discharge
pressure
kPa (kgf/cm
2
, psi)
588 (6.0, 85)
Discharge
rate
2 (US qt, Imp
qt)/min.
59.0 (62.3, 51.9) or more
Relief valve working pressure
kPa (kgf/cm
2
, psi)
588 (6.0, 85)
Oil filter
Filter type
Full-flow filter type
Filtration area
cm
2
(sq in)
(Outer diameter:
68 mm (2.68 in))
800 (124)
(Outer diameter:
65 mm (2.56 in))
470 (72.9)
By-pass valve opening pressure
kPa (kgf/cm
2
, psi)
160 (1.63, 23.2)
Outer diameter
× width
mm (in)
(Outer diameter:
68 mm (2.68 in))
68
× 65 (2.68 × 2.56)
(Outer diameter:
65 mm (2.56 in))
65
× 74.4 (2.56 × 2.93)
Installation screw specifications
M 20
×1.5
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)
14.7 (0.15, 2.1)
Proof pressure
kPa (kgf/cm
2
, psi)
981 (10, 142) or more
Engine oil
Capacity (at overhaul)
2 (US qt, Imp qt)
5.0 (5.3, 4.4)
When replacing engine oil and oil filter
2 (US qt, Imp qt)
MT: 4.3 (4.5, 3.8)
AT: 4.2 (4.4, 3.7)
When replacing engine oil only
2 (US qt, Imp qt)
4.0 (4.2, 3.5)
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