Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. 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,

Engine Coolant.>

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-

MOVAL, Front Under Cover.>

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-

LATION, Front Under Cover.>

5) Lower the vehicle.

6) After installing, check the engine oil level and re-

plenish  it  if  necessary.  <Ref.  to  LU(STI)-11,  IN-

SPECTION, Engine Oil.>

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,

INSPECTION, Engine Oil.>

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

1.

General Description  ...................................................................................2

2.

Accelerator Pedal .......................................................................................4