2004 SUBARU FORESTER oil pressure

LUBRICATION
LU(H4SO)
Page
1. General Description ....................................................................................2
2. Oil Pressure System ...................................................................................8
3. Engine Oil..................................................................................................10
4. Oil Pump ...................................................................................................12
5. Oil Pan and Strainer ..................................................................................16
6. Oil Pressure Switch ...................................................................................20
7. Engine Oil Cooler ......................................................................................21
8. Engine Oil Filter.........................................................................................23
9. Engine Lubrication System Trouble in General.........................................24

LU(H4SO)-2
LUBRICATION
General Description
1. General Description
A: SPECIFICATION
Lubrication methodForced lubrication
Oil pumpPump type Trochoid type
Number of teethInner rotor 9
Outer rotor 10
Outer rotor diameter×thicknessNon-turbo model 78×7 mm (3.07×0.28 in)
Turbo model 78×10 mm (3.07×0.39 in)
Tip clearance between inner and outer rotorStandard 0.04 — 0.14 mm (0.0016 — 0.0055 in)
Limit 0.18 mm (0.0071 in)
Side clearance between inner rotor and pump
caseStandard 0.02 — 0.07 mm (0.0008 — 0.0028 in)
Limit 0.12 mm (0.0047 in)
Case clearance between outer rotor and pump
caseStandard 0.10 — 0.175 mm (0.0039 — 0.0069 in)
Limit 0.20 mm (0.0079 in)
Capacity at
80°C (176°F)Non-turbo
model
600 rpmDischarge
pressure98 kPa (1.0 kg/cm
2, 14 psi)
Discharge
quantity3.22 (3.4 US qt, 2.8 Imp qt)/min.
5,000 rpmDischarge
pressure294 kPa (3.0 kg/cm
2, 43 psi)
Discharge
quantity32.62 (34.4 US qt, 28.7 Imp qt)/min.
Turbo model
600 rpmDischarge
pressure98 kPa (1.0 kg/cm
2, 14 psi)
Discharge
quantity4.62 (4.9 US qt, 4.0 Imp qt)/min.
5,000 rpmDischarge
pressure294 kPa (3.0 kg/cm
2, 43 psi)
Discharge
quantity47.02 (49.7 US qt, 41.4 Imp qt)/min.
Relief valve operation pressureNon-turbo model
490 kPa (5.0 kg/cm
2, 71 psi)
Turbo model
588 kPa (6.0 kg/cm
2, 85 psi)
Oil filterTy p eFull-flow filter type
Filtration areaNon-turbo
760 cm
2 (118 sq in)
Tu r b o
800 cm
2 (124 sq in)
By-pass valve opening pressureNon-turbo
157 kPa (1.60 kg/cm
2, 22.8 psi)
Tu r b o
160 kPa (1.63 kg/cm
2, 23.2 psi)
Outer diameter×widthNon-turbo 80×70 mm (3.15×2.76 in)
Tu r b o 6 8×65 mm (2.68×2.56 in)
Oil filter to engine thread size M 20×1.5
Oil pressure
switchType 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 (at replacement) 4.02 (4.2 US qt, 3.5 Imp qt)

LU(H4SO)-3
LUBRICATION
General Description
B: COMPONENT
1. NON-TURBO MODEL
(1) Plug (13) Oil pressure switch (25) Drain plug
(2) Gasket (14) Oil filler duct (26) Metal gasket
(3) Relief valve spring (15) O-ring (27) Gasket
(4) Relief valve (16) Oil filler cap
(5) Oil seal (17) O-ringTightening torque: N
⋅m (kgf-m, ft-lb)
(6) Oil pump case (18) Baffle plateT1: 5 (0.5, 3.6)
(7) Inner rotor (19) O-ringT2: 6.4 (0.65, 4.7)
(8) Outer rotor (20) Oil strainerT3: 10 (1.0, 7.2)
(9) Oil pump cover (21) Oil level gauge guideT4: 44 (4.5, 32.5)
(10) Oil filter (22) O-ringT5: 25 (2.5, 18.1)
(11) O-ring (23) Oil pan
(12) Oil pump ASSY (24) Oil level gauge
LU-02008
(12)
(11)
T5
T2
T1
T2
T2
T1
T1
T1
T3
T4
T2
(13)
(9)
(8)
(7)
(6)
(20) (19)
(27) (18)(17) (15)
(14) (16)
(24)
(23) (10)
(25)(26)
(5)
(4)
(3)(2)
(1)
(22)
(21)
T4

LU(H4SO)-5
LUBRICATION
General Description
C: CAUTION
 Wear working clothing, including a cap, protec-
tive goggles, and protective shoes during opera-
tion.
 Remove contamination including dirt and corro-
sion before removal, installation or disassembly.
 Keep the disassembled parts in order and pro-
tect them from dust or dirt.
 Before removal, installation or disassembly, be
sure to clarify the failure. Avoid unnecessary re-
moval, installation, disassembly, and replacement.
 Be careful not to burn yourself, because each
part in the vehicle is hot after running.
 Be sure to tighten fasteners including bolts and
nuts to the specified torque.
 Place shop jacks or rigid racks at the specified
points.
 Before disconnecting electrical connectors of
sensors or units, be sure to disconnect the ground
cable from battery.
(1) Plug (16) Oil pressure switch (33) O-ring
(2) Gasket (17) Oil filler cap (34) Oil filter connector (model without
oil cooler)
(3) Relief valve spring (18) O-ring
(4) Relief valve (19) Oil filler duct (35) Plug (model without oil cooler)
(5) Oil seal (20) O-ring (36) O-ring
(6) Oil pump case (21) Rocker cover
(7) Inner rotor (22) Oil strainerTightening torque: N
⋅m (kgf-m, ft-lb)
(8) Outer rotor (23) GasketT1: 5 (0.5, 3.6)
(9) Oil pump cover (24) Oil level gauge guideT2: 6.4 (0.65, 4.7)
(10) Oil filter (25) Oil panT3: 10 (1.0, 7.0)
(11) Oil cooler connector (model with
oil cooler)(26) Oil level gaugeT4: 44 (4.5, 32.5)
(27) Metal gasketT5: 69 (7.0, 50.9)
(12) Water by-pass pipe (model with oil
cooler)(28) Drain plugT6: 6.4 (0.65, 4.7)
(29) O-ringT7: 25 (2.5, 18.1)
(13) Oil cooler (model with oil cooler) (30) Adapter (1)T8: 44 (4.5, 32.5)
(14) O-ring (31) Adapter (2)T9: 54 (5.5, 40)
(15) Oil pump ASSY (32) Baffle plate

LU(H4SO)-8
LUBRICATION
Oil Pressure System
2. Oil Pressure System
A: WIRING DIAGRAM
LU-00102
E
i12
i10
i3
B38
B9
A3
B22
E3
14
E11
A:
B:
B:
i10
123456789101112131415161718192021222324252627282930219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
i3B22
125678
131415169101112
34
17181920
**: 5
: 14
No.14SBF-4SBF-1
B72
14
B72i12
12345678910111213143412
TURBO MODEL NON-TURBO MODELBATTERY
IGNITION
SWITCH
COMBINATION
METER
OIL PRESSURE
WARNING LIGHT
OIL PRESSURE
SWITCH

LU(H4SO)-9
LUBRICATION
Oil Pressure System
B: INSPECTION
Step Check Yes No
1 CHECK COMBINATION METER.
1) Turn the ignition switch to ON. (engine
OFF)
2) Check other warning lights.Does the warning lights illumi-
nate?Go to step 2.Repair or replace
the combination
meter. 4, INSPECTION,
Combination
Meter System.>
2 CHECK HARNESS CONNECTOR BETWEEN
COMBINATION METER AND OIL PRES-
SURE SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from oil pressure
switch.
3) Turn the ignition switch to ON.
4) Measure the voltage of harness between
the combination meter connector and chassis
ground.
Connector & terminal
(E11) No. 1 (+) — Chassis ground (
−):Is the voltage more than 10 V? Replace the oil
pressure switch.Go to step 3.
3 CHECK COMBINATION METER.
1) Turn the ignition switch to OFF.
2) Remove the combination meter.
3) Measure the resistance of combination
meter.
Te r m i n a l
No. B9 — No. A3:Is the resistance less than 10
Ω?Replace the har-
ness connector
between combina-
tion meter and oil
pressure switch.Repair or replace
the combination
meter and the oil
pressure switch
warning light bulb.

LU(H4SO)-20
LUBRICATION
Oil Pressure Switch
6. Oil Pressure Switch
A: REMOVAL
1) Remove the generator from bracket. SC(H4SO)-15, REMOVAL, Generator.>
2) Disconnect the terminal from oil pressure switch.
3) Remove the oil pressure switch.
B: INSTALLATION
1) Apply liquid gasket to the oil pressure switch
threads.
Liquid gasket:
Part No. 004403007
THREE BOND 1324 or equivalent
2) Install the oil pressure switch onto engine block.
Tightening torque:
25 N
⋅m (2.5 kgf-m, 18.1 ft-lb)
3) Connect the terminal of oil pressure switch.
4) Install the generator on bracket. SC(H4SO)-15, INSTALLATION, Generator.>
C: INSPECTION
Make sure oil does not leak or seep from where the
oil pressure switch is installed.
LU-00036
LU-00037
LU-00038
LU-00037
LU-00036

LU(H4SO)-24
LUBRICATION
Engine Lubrication System Trouble in General
9. Engine Lubrication System Trouble in General
A: INSPECTION
Before performing diagnostics, make sure that the engine oil level is correct and no oil leakage exists.
Trouble Possible cause Corrective action
1. Warning light remains
on.1) Oil pressure switch
failureCracked diaphragm or oil leakage within switch Replace.
Broken spring or seized contacts Replace.
2) Low oil pressureClogged oil filter Replace.
Malfunction of oil by-pass valve of oil filter Clean or replace.
Malfunction of oil relief valve of oil pump Clean or replace.
Clogged oil passage Clean.
Excessive tip clearance and side clearance of oil
pump rotor and gearReplace.
Clogged oil strainer or broken pipe Clean or replace.
3) No oil pressureInsufficient engine oil Replenish.
Broken pipe of oil strainer Replace.
Stuck oil pump rotor Replace.
2. Warning light does
not go on.1) Malfunction of combination meter Replace.
2) Poor contact of switch contact points Replace.
3) Disconnection of wiring Repair.
3. Warning light flickers
momentarily.1) Poor contact at terminals Repair.
2) Defective wiring harness Repair.
3) Low oil pressureCheck for the same
possible causes as
listed in 1. — 2).