Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 105

LU(STI)-22

Oil Pressure Switch

LUBRICATION

6. Oil Pressure Switch

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove the generator from the bracket. <Ref. to

SC(STI)-21, REMOVAL, Generator.>

3) Disconnect the terminal from oil pressure switch.

4) Remove the oil pressure switch.

B: INSTALLATION

1) Apply  liquid  gasket  to  the  oil  pressure  switch

threads.
Liquid gasket:

THREE BOND 1324 (Part No. 004403042) or 

equivalent

2) Install the oil pressure switch to cylinder block.
Tightening torque:

25 N·m (2.5 kgf-m, 18.4 ft-lb)

3) Connect the terminal to the oil pressure switch.

4) Install  the  generator  to  the  bracket.  <Ref.  to

SC(STI)-21, INSTALLATION, Generator.>

IN-00203

LU-00036

LU-00037

LU-00038

LU-00037

LU-00036

LU(STI)-23

Oil Pressure Switch

LUBRICATION

5) Connect the ground cable to battery.

C: INSPECTION

1) Check that the oil pressure switch does not have

deformation, cracks or damage.

2) Check  that  there  are  no  oil  leaks  or  oil  oozing

from the oil pressure switch installation portion.

IN-00203

LU(STI)-24

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:

STI model is equipped with engine oil cooler.

1) Lift up the vehicle.

2) Remove  the  under  cover.  <Ref.  to  EI-28,  RE-

MOVAL, Front Under Cover.>

3) Drain  engine  coolant.  <Ref.  to  CO(STI)-13,

DRAINING  OF  ENGINE  COOLANT,  REPLACE-

MENT, Engine Coolant.>

4) Remove  the  engine  oil  filter.  <Ref.  to  LU(STI)-

31, REMOVAL, Engine Oil Filter.>

5) Remove the bolt (B) holding the oil cooler pipe

(A) to the oil pump.

6) Remove the oil cooler pipe (A), oil cooler hose A

(C), oil cooler hose B (H), and oil cooler hose C (I).

7) Remove the oil cooler connector (D) and oil cool-

er (E).

B: INSTALLATION

Install in the reverse order of removal.
NOTE:

• Use a new gasket.

• After installing, check the engine oil level and re-

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

SPECTION, Engine Oil.>
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 the engine oil cooler, oil cooler pipe

and oil cooler connector do not have deformation,

cracks or damage.

2) Make sure the oil cooler hoses are not cracked,

damaged or loose.

3) Blow with compressed air to make sure the cool-

ant passages are not clogged.

4) Make  sure  the  mating  surfaces  of  the  cylinder

block do not have damage.

(A) Oil cooler pipe
(B) Bolt

(C) Oil cooler hose A
(D) Oil cooler connector

(E) Oil cooler

(F) Gasket

(G) Clip

(H) Oil cooler hose B

(I) Oil cooler hose C

LU-02837

(D)

(F)

(E)

(B)

(A)

(G)

(G)

(C)

(H)

(G)

(G)

(G)

(I)

(A) Oil cooler pipe
(B) Bolt

(C) Oil cooler hose A
(D) Oil cooler connector

(E) Oil cooler

(F) Gasket

(G) Clip

(H) Oil cooler hose B

(I) Oil cooler hose C

(D)

(F)

(E)

T2

(B)

(A)

(C)

(H)

(G)

(G)

(G)

T1

LU-02838

(G)

(I)

(G)

LU(STI)-25

Oil Pipe

LUBRICATION

8. Oil Pipe

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove  the  intercooler.  <Ref.  to  IN(STI)-12,

REMOVAL, Intercooler.> <Ref. to IN(w/o STI)-12,

REMOVAL, Intercooler.>

3) Remove the turbocharger upper cover.

4) Remove the oil inlet pipe from the turbocharger.
CAUTION:

In order to prevent damaging the oil pipe on the

cylinder head side, fix the section (a) shown in

the figure when loosing the oil inlet pipe flare

nut, and avoid the part  from  rotating  together

while loosening the nut.

5) Remove the turbocharger stay.

6) Remove the turbocharger oil pipe.

IN-00203

LU-02694

(A) Union bolt without filter (without protrusion)
(B) Gasket

(C) Turbocharger oil pipe

LU-02719

(a)

LU-02692

LU-02691

LU-02696

(C)

(B)

(A)

(B)