Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 81
ME(STI)-86
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-04737
(A)
(B)
ME-04738
(C)
25
ME-02471
(E)
(D)
ME-04739
(F)
ME-04740
120
(C)
(G)
ME(STI)-87
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 cylinder
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
ME(STI)-88
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-04830
(A)
ME-00158
ST1
ST3
ME-00159
ME-00160
ME(STI)-89
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)
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