Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service 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
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