Subaru Legacy IV (2008 year). Service manual — part 91
LU(H4SO)-21
Oil Pressure Switch
LUBRICATION
5) Connect the ground cable to battery.
6) Install the collector cover. (Turbo model)
C: INSPECTION
Check the oil pressure switch installation portion for
oil leakage and oil seepage.
IN-00203
LU(H4SO)-22
Engine Oil Cooler
LUBRICATION
7. Engine Oil Cooler
A: REMOVAL
CAUTION:
If engine oil is spilt onto the exhaust pipe, wipe
it off with cloth to avoid emission of smoke or
causing a fire.
NOTE:
An engine oil cooler is installed on DOHC turbo
models.
1) Set the vehicle on a lift.
2) Lift up the vehicle.
3) Remove the under cover.
4) Drain engine coolant. <Ref. to CO(H4DOTC)-
14, DRAINING OF ENGINE COOLANT, RE-
PLACEMENT, Engine Coolant.>
5) Remove the engine oil filter. <Ref. to LU(H4SO)-
23, REMOVAL, Engine Oil Filter.>
6) Remove the bolt (B) holding the oil cooler pipe
(A) to the oil pump.
7) Remove the oil cooler pipe (A) and oil cooler
hose (C).
8) Remove the oil cooler connector (D) and remove
the oil cooler (E).
B: INSTALLATION
Install in the reverse order of removal.
NOTE:
Use a new gasket.
Tightening torque:
T1: 6.4 N·m (0.7 kgf-m, 4.7 ft-lb)
T2: 54 N·m (5.5 kgf-m, 39.8 ft-lb)
C: INSPECTION
1) Check that coolant passages are not clogged
using an compressed air.
2) Check the mating surfaces of cylinder block,
gasket groove and oil cooler for damage.
(A) Oil cooler pipe
(B) Bolt
(C) Oil cooler hose
(D) Oil cooler connector
(E) Oil cooler
(F) Gasket
LU-02398
(D)
(F)
(E)
(B)
(A)
(C)
(A) Oil cooler pipe
(B) Bolt
(C) Oil cooler hose
(D) Oil cooler connector
(E) Oil cooler
(F) Gasket
(D)
(F)
(E)
T2
(B)
(A)
(C)
T1
LU-02399
LU(H4SO)-23
Engine Oil Filter
LUBRICATION
8. Engine Oil Filter
A: REMOVAL
CAUTION:
If the engine oil is spilt over exhaust pipe or the
under cover, wipe it off with cloth to avoid emis-
sion of smoke or causing a fire.
1) Set the vehicle on a lift.
2) Lift up the vehicle.
3) Remove the service hole cover clip located on
the under cover.
4) Rotate the service hole cover in the arrow direc-
tion.
5) Remove the oil filter.
• Oil filter (Black)
Remove using the ST.
ST
18332AA000
OIL FILTER WRENCH
(Outer diameter: 68 mm
(2.68 in) for oil filter (black))
• Oil filter (Blue)
Remove using a general tool (65/67 mm 14 Flutes).
B: INSTALLATION
CAUTION:
Do not tighten excessively, or oil may leak.
1) Clean the oil filter installation surface on cylinder
block or oil cooler.
2) Obtain a new oil filter and apply a thin coat of en-
gine oil to the seal rubber.
3) Install the oil filter turning it by hand, being care-
ful not to damage the seal rubber.
• Tighten the oil filter (Black) with an outer diame-
ter of 68 mm (2.68 in) (approx. 1 rotation) after the
seal rubber of the oil filter comes in contact with cyl-
inder block or oil cooler. When using a torque
wrench, tighten to 14 N·m (1.4 kgf-m, 10.3 ft-lb).
• Tighten the oil filter (Blue) with an outer diameter
of 67.4 mm (2.65 in) (approx. 7/8 rotation) after the
seal rubber of the oil filter comes in contact with cyl-
inder block or oil cooler. When using a torque
wrench, tighten to 12 N·m (1.2 kgf-m, 8.9 ft-lb).
4) Return the service hole cover to the original po-
sition.
5) Lower the vehicle.
C: INSPECTION
1) After installing the oil filter, run the engine and
make sure that no oil is leaking around seal rubber.
NOTE:
The filter element and filter case are permanently
jointed; therefore, interior cleaning is not neces-
sary.
2) Check the engine oil level. <Ref. to LU(H4SO)-9,
INSPECTION, Engine Oil.>
LU-02190
LU-02191
(A)
LU-02192
LU(H4SO)-24
Engine Lubrication System Trouble in General
LUBRICATION
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
failure
Cracked diaphragm or oil leakage within switch
Replace.
Broken spring or seized contacts
Replace.
2) Low oil pressure
Clogging of oil filter
Replace.
Malfunction of oil by-pass valve in oil filter
Clean or replace.
Malfunction of oil relief valve in oil pump
Clean or replace.
Clogged oil passage
Clean.
Excessive tip clearance and side clearance of oil
pump rotor and gear
Replace.
Clogged oil strainer or broken pipe
Clean or replace.
3) No oil pressure
Insufficient engine oil (including deterioration)
Replace.
Broken pipe of oil strainer
Replace.
Stuck oil pump rotor
Replace.
2. Warning light does
not illuminate.
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 of terminals
Repair.
2) Defective wiring harness
Repair.
3) Low oil pressure
Check for the same
possible causes as
listed 1. — 2.
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