Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 72
ME(STI)-50
Timing Belt
MECHANICAL
15.Timing Belt
A: REMOVAL
NOTE:
• When replacing a single part, perform the work
with the engine assembly installed to body.
• When performing the work with the engine in-
stalled to body, the following parts must also be re-
moved/installed.
• Radiator main fan motor assembly <Ref. to
CO(STI)-23, REMOVAL, Radiator Main Fan and
Fan Motor.> <Ref. to CO(STI)-23, INSTALLA-
TION, Radiator Main Fan and Fan Motor.>
• Radiator sub fan motor assembly <Ref. to
CO(STI)-25, REMOVAL, Radiator Sub Fan and
Fan Motor.> <Ref. to CO(STI)-25, INSTALLA-
TION, Radiator Sub Fan and Fan Motor.>
• When performing the work with the engine in-
stalled to body, protect the radiator with cardboards
or blankets.
1. TIMING BELT
1) Remove the crank pulley. <Ref. to ME(STI)-47,
2) Remove the timing belt cover. <Ref. to ME(STI)-
49, REMOVAL, Timing Belt Cover.>
3) Remove the timing belt guide.
4) If the alignment mark or arrow mark (which indi-
cates the direction of rotation) on timing belt fade
away, put new marks before removing the timing
belt as shown in procedures below.
(1) Turn the crankshaft using ST, and align the
alignment marks on crank sprocket, intake cam
sprocket LH, exhaust cam sprocket LH, intake
cam sprocket RH and exhaust cam sprocket
RH with marks on oil pump and notches of tim-
ing belt cover.
ST 499987500
CRANKSHAFT SOCKET
ME-00230
ME-03124
ME-03125
ME-03126
ME-00231
ST
ME(STI)-51
Timing Belt
MECHANICAL
(2) Using white paint, put an alignment mark or
an arrow mark on timing belts in relation to the
crank sprocket and cam sprockets.
Z
1
: 54.5 teeth
Z
2
: 51 teeth
Z
3
: 28 teeth
5) Remove the belt idler (A).
6) Remove the timing belt.
CAUTION:
After the timing belt has been removed, never
rotate the intake and exhaust sprocket. If the
cam sprocket is rotated, the intake and exhaust
valve heads strike together and valve stems are
bent.
2. AUTOMATIC BELT TENSION ADJUST-
ER ASSEMBLY AND BELT IDLER
1) Remove the belt idler (A) and (B).
2) Remove the belt idler No. 2.
3) Remove the automatic belt tension adjuster as-
sembly.
ME-00070
ME-03127
ME-03128
Z
3
Z
1
Z
2
Z
3
(A)
ME-03935
(A)
(B)
ME-03936
ME-04977
ME-04978
ME(STI)-52
Timing Belt
MECHANICAL
B: INSTALLATION
1. AUTOMATIC BELT TENSION ADJUST-
ER ASSEMBLY AND BELT IDLER
1) Prepare for installation of the automatic belt ten-
sion adjuster assembly.
CAUTION:
• Always use a vertical type pressing tool to
move the adjuster rod down.
• Do not use a lateral type vise.
• Push the adjuster rod vertically.
• Press-in the push adjuster rod gradually tak-
ing three minutes or more.
• Do not allow press pressure to exceed 9,807
N (1,000 kgf, 2,205 lbf).
• Push in the adjuster rod to the end face of the
cylinder. However, do not press the adjuster
rod below the end face of the cylinder. Doing so
may damage the cylinder.
• Do not release the press pressure until stop-
per pin is completely inserted.
(1) Attach the automatic belt tension adjuster
assembly to vertical pressing tool.
(2) Slowly push in the adjuster rod with a pres-
sure of 165 N (16.8 kgf, 37.1 lbf) or more until
the adjuster rod is aligned with the stopper pin
hole in the cylinder.
(3) With a 2 mm (0.08 in) dia. stopper pin or a 2
mm (nominal) dia. hex wrench inserted into the
stopper pin hole in cylinder, secure the adjuster
rod.
2) Install the automatic belt tension adjuster assembly.
Tightening torque:
39 N·m (4.0 kgf-m, 28.8 ft-lb)
3) Install the belt idler No. 2.
Tightening torque:
39 N·m (4.0 kgf-m, 28.8 ft-lb)
4) Install the belt idlers.
Tightening torque:
39 N·m (4.0 kgf-m, 28.8 ft-lb)
Tightening torque:
25 N·m (2.5 kgf-m, 18.4 ft-lb)
ME-00239
ME-00350
ME-04979
ME-04977
ME-04980
ME-04981
ME(STI)-53
Timing Belt
MECHANICAL
2. TIMING BELT
1) Prepare for installation of the automatic belt ten-
sion adjuster assembly. <Ref. to ME(STI)-52, AU-
ASSEMBLY AND BELT IDLER, INSTALLATION,
2) Align the mark (B) on crank sprocket with the
mark (A) on oil pump.
3) Align the single line mark (B) on the exhaust cam
sprocket RH with notch (A) on the timing belt cover.
4) Align the single line mark (B) on the intake cam
sprocket RH with notch (A) on the timing belt cover.
Make sure that the double line marks (C) on intake
and exhaust cam sprockets are aligned.
5) Align the single line mark (B) on exhaust cam
sprocket LH with notch (A) on the timing belt cover
by turning the sprocket counterclockwise (as
viewed from front of engine).
6) Align the single line mark (B) on intake cam
sprocket LH with notch (A) on the timing belt cover
by turning the sprocket clockwise (as viewed from
front of engine). Make sure the double line marks
(C) on the intake and exhaust cam sprockets are
aligned.
(B)
ME-04082
(A)
ME-04083
(A)
(B)
ME-04084
(A)
(C)
(B)
ME-04085
(A)
(B)
ME-04086
(B)
(A)
(C)
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