Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 107
LU(STI)-30
Oil Pipe
LUBRICATION
19) Connect the battery ground terminal.
20) Fill engine coolant. <Ref. to CO(STI)-13, FILL-
ING OF ENGINE COOLANT, REPLACEMENT,
Engine Coolant.> <Ref. to CO(w/o STI)-13, FILL-
ING OF ENGINE COOLANT, REPLACEMENT,
C: INSPECTION
1. INSPECTING UNION BOLT WITH FILTER
Check the filter part of union bolt for clogging or
damage, and if defective, replace the union bolt
with filter with the new part.
2. OTHER INSPECTIONS
1) Check that the oil pipe and union bolt have no
deformation, cracks and other damages.
2) Check that there are no oil leaks or oil oozing
from the oil pipe attachment section.
(A) Union bolt with filter (with protrusion)
(B) Union bolt without filter (without protrusion)
(C) Oil pipe RH
(D) Oil pipe LH
(E) Gasket
IN-00203
ME-05030
(A)
(B)
(D)
(A)
(B)
(C)
(E)
(E)
(E)
(E)
(E)
LU(STI)-31
Engine Oil Filter
LUBRICATION
9. 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 emit-
ting smoke or causing a fire.
1) Lift up the vehicle.
2) Remove the under cover. <Ref. to EI-28, RE-
3) Remove the oil filter.
• Oil filter (Black)
Remove using the ST.
ST 18332AA000 OIL FILTER WRENCH (OUT-
ER DIAMETER: 68 MM (2.68
IN) FOR OIL FILTER)
• 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 of the oil filter.
• 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 the
cylinder 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) Install the under cover. <Ref. to EI-28, INSTAL-
5) Lower the vehicle.
6) After installing, check the engine oil level and re-
plenish it if necessary. <Ref. to LU(STI)-11, IN-
C: INSPECTION
1) After installing the oil filter, run the engine and
check for oil leakage 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(STI)-11,
LU-02707
LU(STI)-32
Engine Lubrication System Trouble in General
LUBRICATION
10.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
Warning light
remains ON.
a. Oil pressure switch failure
Cracked diaphragm or oil leakage within switch
Replace.
Broken spring or seized contacts
Replace.
b. Low oil pressure
Clogging of oil filter
Replace.
Malfunction of oil by-pass valve in oil filter
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
Replace.
Clogged oil strainer or broken pipe
Clean or replace.
c. No oil pressure
Insufficient engine oil (degradation, etc.)
Replace.
Broken pipe of oil strainer
Replace.
Stuck oil pump rotor
Replace.
Warning light does
not illuminate.
a. Malfunction of combination meter
Replace.
b. Poor contact of switch contact points
Replace.
c. Disconnection of wiring
Repair.
Warning light flickers
momentarily.
a. Defective terminal contact
Repair.
b. Defective wiring harness
Repair.
c. Oil pressure switch failure
Cracked diaphragm or oil leakage within switch
Replace.
Broken spring or seized contacts
Replace.
d. Low oil pressure
Clogging of oil filter
Replace.
Malfunction of oil by-pass valve in oil filter
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
Replace.
Clogged oil strainer or broken pipe
Clean or replace.
SPEED CONTROL SYSTEMS
SP(STI)
Page
General Description . . . . . . . . . . . . . . . . . . . . ...2
Accelerator Pedal . . . . . . . . . . . . . . . . . . . . . ...4
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