Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 80

ME(STI)-82

Cylinder Block

MECHANICAL

26) Remove the service hole plugs using a hexa-

gon wrench [14 mm].

27) Remove the service hole cover.

28) Rotate the crankshaft to bring #1 and #2 pis-

tons to bottom dead center position, then remove

the piston snap ring through service hole of #1 and

#2 cylinders.

29) Draw out the piston pin from #1 and #2 pistons

using ST.

ST 499097700

PISTON PIN REMOVER

ASSY

NOTE:

Be careful not to confuse the original combination

of piston, piston pin and cylinder.

30) Similarly draw out the piston pins from #3 and

#4 pistons.

31) Remove the cylinder block connecting bolt on

the RH side.

32) Loosen the cylinder block connecting bolt on

the LH side by 2 to 3 turns.

33) Set the part so that the cylinder block LH is on

the upper side, and remove the cylinder block con-

necting bolt.

ME-00140

ME-00141

ME-03325

ST

ME(STI)-83

Cylinder Block

MECHANICAL

34) Separate the cylinder block LH and RH.
NOTE:

When separating the cylinder block, do not allow the connecting rod to fall or damage the cylinder block.

35) Remove the rear oil seal.

36) Remove the crankshaft together with connect-

ing rod.

37) Remove the crankshaft bearings from cylinder

block using a hammer handle.
NOTE:

• Press the crankshaft bearing at the end opposite

to locking lip to remove.

• Be careful not to confuse the crankshaft bearing

combination.

38) Remove each piston from the cylinder block us-

ing a wooden bar or hammer handle.
NOTE:

Be careful not to confuse the original combination

of piston and cylinder.

(1)

Cylinder block

(4)

Crankshaft bearing

(6)

Seal washer

(2)

Rear oil seal

(5)

Piston

(7)

Washer

(3)

Crankshaft

ME-04724

(2)

(3)

(4)

(4)

(5)

(6)

(5)

(1)

(1)

(7)

ME(STI)-84

Cylinder Block

MECHANICAL

B: INSTALLATION

1) Remove oil on the mating surface of cylinder

block before installation. Apply a coat of engine oil

to the bearing and crankshaft journal.

2) Position the crankshaft and O-ring on cylinder

block RH.
NOTE:

Use new O-rings.

3) Apply liquid gasket to the mating surfaces of cyl-

inder block RH, and position cylinder block LH.
NOTE:

• Install within 5 min. after applying liquid gasket.

• Do not allow liquid gasket to jut into O-ring

grooves, oil passages, bearing grooves, etc.

Liquid gasket:

THREE BOND 1217G (Part No. K0877Y0100)

or equivalent

(1)

Crankshaft bearing

(4)

Rear oil seal

(6)

Seal washer

(2)

Crankshaft

(5)

O-ring

(7)

Washer

(3)

Cylinder block

ME-04725

(4)

(1)

(3)

(6)

(6)

(7)

(7)

(3)

(2)

(5)

(6)

(7)

ME-00145

ME(STI)-85

Cylinder Block

MECHANICAL

4) Apply a coat of engine oil to the washer and bolt

thread.
NOTE:

Use a new seal washer.

5) Tighten the 10 mm cylinder block connecting

bolts on the LH side (A — D) in alphabetical order.
Tightening torque:

10 N·m (1.0 kgf-m, 7.4 ft-lb)

6) Tighten the 10 mm cylinder block connecting

bolts on the RH side (E — J) in alphabetical order.
Tightening torque:

10 N·m (1.0 kgf-m, 7.4 ft-lb)

7) Tighten the LH side cylinder block connecting

bolts (A — D) further in alphabetical order.
Tightening torque:

18 N·m (1.8 kgf-m, 13.3 ft-lb)

8) Tighten the RH side cylinder block connecting

bolts (E — J) further in alphabetical order.
Tightening torque:

18 N·m (1.8 kgf-m, 13.3 ft-lb)

9) Tighten the LH side cylinder block connecting

bolts (A — D) further in alphabetical order.

• (A), (C): Angle tightening
Tightening angle:

90°

• (B), (D): Torque tightening
Tightening torque:

40 N·m (4.1 kgf-m, 29.5 ft-lb)

10) Tighten the RH side cylinder block connecting

bolts (E — J) further in alphabetical order.
Tightening angle:

90°

ME-00779

(A)

(B)

(D)

(C)

ME-00780

(J)

(H)

(G)

(E)

(F)

(I)

ME-00779

(A)

(B)

(D)

(C)

ME-00780

(J)

(H)

(G)

(E)

(F)

(I)

ME-00779

(A)

(B)

(D)

(C)

ME-00780

(J)

(H)

(G)

(E)

(F)

(I)