Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 175

ME(w/o STI)-81

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(w/o STI)-82

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)

ME(w/o STI)-83

Cylinder Block

MECHANICAL

11) Tighten the 8 mm and 6 mm cylinder block con-

necting bolts on the LH side (A — H) in alphabetical

order.
Tightening torque:

(A) — (G): 25 N·m (2.5 kgf-m, 18.4 ft-lb)

(H): 6.4 N·m (0.7 kgf-m, 4.7 ft-lb)

12) Apply a coat of engine oil to the oil seal inner

periphery and outer periphery, and install the rear

oil seal using ST1 and ST2.
NOTE:

Use a new rear oil seal.

ST1 499597100

CRANKSHAFT OIL SEAL

GUIDE

ST2 499587200

CRANKSHAFT OIL SEAL IN-

STALLER

13) Position the top ring gap at (A) or (B) in the fig-

ure.

14) Position the second ring gap at 180° on the re-

verse side the top ring gap.

15) Position the upper rail gap at (C) in the figure.

16) Align the upper rail spin stopper (E) to the side

hole (D) on the piston.

17) Position the expander gap at (F) in the figure on

the 180° opposite direction of (C).

18) Set the lower rail gap at position (G), located

120° clockwise from (C) in the figure.

NOTE:

• Make sure ring gaps do not face the same direc-

tion.

• Make sure ring gaps are not within the piston

skirt area.

(A) Rear oil seal
(B) Flywheel attachment bolt

ME-00147

(B)

(C)

(D)

(E)

(F)

(G)

(H)

(A)

ME-04998

ST1

ST2

(B)

(A)

ME-04726

(A)

(B)

ME-04727

(C)

25

ME-02471

(E)

(D)

ME-04728

(F)

ME-04729

120

(C)

(G)

ME(w/o STI)-84

Cylinder Block

MECHANICAL

19) Install the snap ring.

Before positioning the piston on the cylinder block,

attach the snap ring in the service hole of the cylin-

der block, and the piston hole on the opposite side.
NOTE:

Use new snap rings.

(A) Front side

ME-04764

#4

#3

#2

#1

(A)

(1)

Piston

(4)

Gasket

Tightening torque: N·m (kgf-m, ft-lb)

(2)

Piston pin

(5)

Service hole plug

T: 70 (7.1, 51.6)

(3)

Snap ring

ME-04730

(1)

(1)

(2)

(2)

(3)

(3)

(4)

(4)

(5)

(5)

T