Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 176

ME(w/o STI)-85

Cylinder Block

MECHANICAL

20) Install the piston.

(1) Set the parts so that the #1 and #2 cylinders

are on the upper side.

(2) Using  the  ST1,  turn  the  crankshaft  so  that

#1  and  #2  connecting  rods  are  set  at  bottom

dead center.

ST1 499987500

CRANKSHAFT SOCKET

(3) Apply a coat of engine oil to the pistons and

cylinders and insert pistons in their cylinders us-

ing ST2.

ST2 498747300

PISTON GUIDE

NOTE:

Face the piston front mark towards the front of the

engine.

21) Install the piston pin.

(1) Apply a coat of engine oil to ST3.

(2) Insert ST3 into the service hole to align the

piston  pin  hole  and  the  connecting  rod  small

end.

ST3 499017100

PISTON PIN GUIDE

(3) Apply a thin coat of engine oil to piston pin,

and  insert  the  piston  pin  into  piston  and  con-

necting rod through service hole.

(4) Install the snap ring.

NOTE:

Use new snap rings.

(5) Apply liquid gasket to the threaded portion

of the service hole plug.

Liquid gasket:

THREE BOND 1105 (Part No. 004403010) or 

equivalent

(A) Front mark

ME-00157

ST2

ST1

ME-00742

(A)

ME-00158

ST1

ST3

ME-00159

ME-00160

ME(w/o STI)-86

Cylinder Block

MECHANICAL

(6) Install the service hole plug and gasket.

NOTE:

Use a new gasket.
Tightening torque:

70 N·m (7.1 kgf-m, 51.6 ft-lb)

ME-00140

(1)

Piston

(5)

Service hole plug

Tightening torque: N·m (kgf-m, ft-lb)

(2)

Piston pin

(6)

Service hole cover

T1: 6.4 (0.7, 4.7)

(3)

Snap ring

(7)

O-ring

T2: 70 (7.1, 51.6)

(4)

Gasket

 

 

 

 

ME-05040

(2)

(3)

(1)

(2)

(6)

(3)

(7)

(4)

(5)

T2

T1

(1)

ME(w/o STI)-87

Cylinder Block

MECHANICAL

(7) Set the parts so that the #3 and #4 cylinders

are on the upper side. Following the same pro-

cedures as used for #1 and #2 cylinders, install

the pistons and piston pins.

(8) Install the service hole cover.

NOTE:

Use new O-rings.
Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

22) Install  the  water  tank  pipe  assembly  onto  the

cylinder block RH.
NOTE:

Use a new clamp for the water tank pipe assembly

clamp, fit the cut out in the ST with the protrusion on

the  clamp  as  shown  in  the  figure,  and  lock  the

clamp.

ST 18353AA000 CLAMP PLIERS

23) Install the baffle plate.
Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

24) Install the oil strainer.
NOTE:

Use new O-rings.
Tightening torque:

10 N·m (1.0 kgf-m, 7.2 ft-lb)

25) Tighten  the  oil  strainer  stay  together  with  the

baffle plate.
Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

26) Apply liquid gasket to the mating surfaces of oil

pan, and install the oil pan.
NOTE:

Install within 5 min. after applying liquid gasket.
Liquid gasket:

THREE BOND 1217G (Part No. K0877Y0100) 

or equivalent

Tightening torque:

5 N·m (0.5 kgf-m, 3.7 ft-lb)

27) Apply liquid gasket to the mating surface of oil

separator cover and the threaded portion of bolt (A)

shown  in  the  figure  (when  reusing  the  bolt),  and

then install the oil separator cover.
NOTE:

• Install within 5 min. after applying liquid gasket.

• Use new oil separator cover.
Liquid gasket:

Mating surface

THREE BOND 1217G (Part No. 

K0877Y0100) or equivalent

Bolt thread (A) (when reusing the bolt)

THREE BOND 1324 (Part No. 004403042) or 

equivalent

Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

28) Install the flywheel. <Ref. to CL-14, INSTALLA-

TION, Flywheel.>

29) Install the clutch disc and cover. <Ref. to CL-

11, INSTALLATION, Clutch Disc and Cover.>

ME-04374

ST

(A) Gasket

LU-02353

(A)

ME-03333

(A)

ME(w/o STI)-88

Cylinder Block

MECHANICAL

30) Install the oil pump.

(1) Using the ST, install the front oil seal.

ST 499587100

OIL SEAL INSTALLER

NOTE:

Use a new front oil seal.

(2) Apply liquid gasket to the mating surfaces of

oil pump.

NOTE:

Install within 5 min. after applying liquid gasket.
Liquid gasket:

THREE BOND 1217G (Part No. K0877Y0100) 

or equivalent

(3) Apply a thin coat of engine oil to the inside of

front oil seal.

(4) Install the oil pump to cylinder block.

CAUTION:

• Be  careful  not  to  damage  the  front  oil  seal

during installation.

• Make sure the front oil seal lip is not folded.
NOTE:

• Align the flat surface of oil pump’s inner rotor with

that of crankshaft before installation.

• Use new O-rings.

• Do not forget to assemble O-rings.

(5) Apply liquid gasket to the three bolts thread

shown in figure. (when reusing bolts)

Liquid gasket:

THREE BOND 1324 (Part No. 004403042) or 

equivalent

Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

31) Install the water pump and gasket.
NOTE:

• When installing the water pump, tighten bolts in

two  stages  in  alphabetical  order  as  shown  in  the

figure.

• Use a new gasket.
Tightening torque:

First:

12 N·m (1.2 kgf-m, 8.9 ft-lb)

Second:

12 N·m (1.2 kgf-m, 8.9 ft-lb)

32) Install the water by-pass pipe for heater.
Tightening torque:

6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

(A) O-ring

LU-00021

ST

ME-00165

(A)

ME-00312

ME-04946

ME-04743

(F)

(C)

(A)

(E)

(D)

(B)