Subaru Legacy III (2000-2003 year). Service manual — part 445
CO(H4DOSTC)-34
COOLING
ENGINE COOLING SYSTEM TROUBLE IN GENERAL
13.Engine Cooling System Trouble in General
A: INSPECTION
Trouble
Corrective action
Over-heating
a. Insufficient engine coolant
Replenish engine coolant, inspect for leakage, and
repair.
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(H4DOSTC)-2, ENGINE, PROCEDURE,
Basic Diagnostic Procedure.>
h. Clogged or leaking radiator
Clean or repair, or replace.
i. Engine oil mixed in engine coolant
Replace engine coolant.
j. Air/fuel mixture ratio too lean
Inspect and repair fuel injection system.
<Ref. to EN(H4DOSTC)-2, ENGINE, 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
Repair or replace.
n. Dragging brake
Adjust.
o. Improper transmission oil
Replace.
p. Malfunction of electric fan
Inspect radiator fan relay, engine coolant temperature
sensor or radiator motor and replace there.
Over-cooling
a. Atmospheric temperature extremely low
Partly cover radiator front area.
b. Malfunction of 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 crankcase Repair or replace.
f. Damaged or cracked thermostat case
Repair or replace.
g. Leakage from radiator
Repair 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(H4DOSTC)
Page
General Description . . . . . . . . . . . . . . . . . . . . . 2
Oil Pressure System . . . . . . . . . . . . . . . . . . . . ...6
Engine Oil. . . . . . . . . . . . . . . . . . . . . . . . . 8
Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . ...10
Oil Pan and Strainer . . . . . . . . . . . . . . . . . . . . ..14
Oil Pressure Switch. . . . . . . . . . . . . . . . . . . . ...18
Engine Oil Cooler . . . . . . . . . . . . . . . . . . . . . ..19
Engine Oil Filter. . . . . . . . . . . . . . . . . . . . . . .21
Engine Lubrication System Trouble in General. . . . . . . . . . .22
LU(H4DOSTC)-2
LUBRICATION
GENERAL DESCRIPTION
1. General Description
A: SPECIFICATIONS
Lubrication method
Forced lubrication
Oil pump
Pump type
Trochoid type
Number of teeth
Inner rotor
9
Outer rotor
10
Outer rotor diameter
×
thickness
78
×
7 mm (3.07
×
0.28 in)
Tip clearance between inner and outer rotor
STANDARD
0.04 — 0.14 mm (0.0016 — 0.0055 in)
LIMIT
0.18 mm (0.0071 in)
Side clearance between inner rotor and pump
case
STANDARD
0.02 — 0.07 mm (0.0008 — 0.0028 in)
LIMIT
0.12 mm (0.0047 in)
Case clearance between outer rotor and pump
case
STANDARD
0.10 — 0.175 mm (0.0039 — 0.0069 in)
LIMIT
0.20 mm (0.0079 in)
Capacity at
80
°
C (176
°
F)
600 rpm
- Discharge pressure
98 kPa (1.0 kg/cm
2
, 14 psi)
- Discharge quantity
4.6
2
(4.9 US qt, 4.0 Imp qt)/min.
5,000 rpm
- Discharge pressure
294 kPa (3.0 kg/cm
2
, 43 psi)
- Discharge quantity
47.0
2
(12.42 US gal, 10.34 Imp gal)/min.
Relief valve operation pressure
588 kPa (6.0 kg/cm
2
, 85 psi)
Oil filter
Type
Full-flow filter type
Filtration area
760 cm
2
(118 sq in)
By-pass valve opening pressure
157 kPa (1.6 kg/cm
2
, 23 psi)
Outer diameter
×
width
80
×
75 mm (3.15
×
2.95 in)
Installation screw type
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
14.7 kPa (0.15 kg/cm
2
, 2.1 psi)
Proof pressure
More than 981 kPa (10 kg/cm
2
, 142 psi)
Oil capacity (when replacing oil)
Approx. 4.5
2
(4.8 US qt, 4.0 Imp qt)
LU(H4DOSTC)-3
LUBRICATION
GENERAL DESCRIPTION
B: COMPONENT
(1) Plug
(16) Oil pressure switch
Tightening torque: N·m (kgf-m, ft-lb)
(2) Gasket
(17) Oil filler duct
T1: 5 (0.5, 3.6)
(3) Relief valve spring
(18) O-ring
T2: 6.4 (0.65, 4.7)
(4) Relief valve
(19) Rocker cover
T3: 10 (1.0, 7.2)
(5) Oil seal
(20) Baffle plate
T4: 44 (4.5, 33)
(6) Oil pump case
(21) O-ring
T5: 69 (7.0, 51)
(7) Inner rotor
(22) Oil strainer
T6: 6.4 (0.65, 4.7)
(8) Outer rotor
(23) Gasket
T7: 25 (2.5, 18.1)
(9) Oil pump cover
(24) Oil level gauge guide
T8: 44 (4.5, 33)
(10) Oil filter
(25) Oil pan
T9: 54 (5.5, 40)
(11) Connector (MT model)
(26) Oil level gauge
(12) Water by-pass (MT model)
(27) Metal gasket
(13) Oil cooler (MT model)
(28) Drain plug
(14) O-ring
(29) O-ring
(15) Oil pump ASSY
LU-00149
(15)
(14)
T7
T2
T1
T5
T2
T6
T9
T1
T1
T3
T8
T6
T4
T2
(29)
(9)
(8)
(7)
(6)
(13)
(12)
(22)
(21)
(23)
(24)
(20)
(19)
(18)
(17)
(16)
(26)
(25)
(11)
(10)
(28)
(27)
(5)
(4)
(3)
(2)
(1)
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