Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 169
ME(w/o STI)-57
Cam Sprocket
MECHANICAL
16.Cam Sprocket
A: REMOVAL
NOTE:
When replacing a single part, perform the work with
the engine assembly installed to body.
1) Remove the crank pulley. <Ref. to ME(w/o STI)-
2) Remove the timing belt cover. <Ref. to ME(w/o
STI)-47, REMOVAL, Timing Belt Cover.>
3) Remove the timing belt. <Ref. to ME(w/o STI)-
4) Remove the actuator cover from intake cam
sprocket.
5) Use the ST to lock the cam sprocket, and re-
move the cam sprocket bolt.
ST 499207400
CAM SPROCKET WRENCH
ST 499977500
CAM SPROCKET WRENCH
6) Remove the cam sprocket.
B: INSTALLATION
1) Install the cam sprocket.
2) Use the ST to lock the cam sprocket, and install
the cam sprocket bolt.
NOTE:
Do not confuse cam sprockets (LH) and (RH) dur-
ing installation.
ST 499207400
CAM SPROCKET WRENCH
Tightening torque:
Tighten to 30 N·m (3.1 kgf-m, 22.1 ft-lb) of
torque, and then tighten further by 45°.
ST 499977500
CAM SPROCKET WRENCH
Tightening torque:
Tighten to 30 N·m (3.1 kgf-m, 22.1 ft-lb) of
torque, and then tighten further by 45°.
3) Install the actuator cover to intake cam sprocket.
NOTE:
Use new O-rings.
Tightening torque:
3.4 N·m (0.3 kgf-m, 2.5 ft-lb)
4) Install the timing belt. <Ref. to ME(w/o STI)-50,
5) Install the timing belt cover. <Ref. to ME(w/o
STI)-47, INSTALLATION, Timing Belt Cover.>
6) Install the crank pulley. <Ref. to ME(w/o STI)-45,
C: INSPECTION
1) Check the cam sprocket teeth for abnormal wear
and scratches.
2) Make sure there is no free play between cam
sprocket and key.
ME-03282
ST
ME-03283
ST
ME-03282
ST
ME-03283
ST
ME(w/o STI)-58
Crank Sprocket
MECHANICAL
17.Crank Sprocket
A: REMOVAL
NOTE:
When replacing a single part, perform the work with
the engine assembly installed to body.
1) Remove the crank pulley. <Ref. to ME(w/o STI)-
2) Remove the timing belt cover. <Ref. to ME(w/o
STI)-47, REMOVAL, Timing Belt Cover.>
3) Remove the timing belt. <Ref. to ME(w/o STI)-
4) Remove the crank sprocket.
B: INSTALLATION
1) Install the crank sprocket.
2) Install the timing belt. <Ref. to ME(w/o STI)-50,
3) Install the timing belt cover. <Ref. to ME(w/o
STI)-47, INSTALLATION, Timing Belt Cover.>
4) Install the crank pulley. <Ref. to ME(w/o STI)-45,
C: INSPECTION
1) Check the crank sprocket teeth for abnormal
wear and scratches.
2) Make sure there is no free play between crank
sprocket and key.
3) Check the crank sprocket protrusion used for
sensor for damage and contamination of foreign
matter.
ME-04983
ME-04983
ME(w/o STI)-59
Camshaft
MECHANICAL
18.Camshaft
A: REMOVAL
1) Remove the engine from the vehicle. <Ref. to
ME(w/o STI)-29, REMOVAL, Engine Assembly.>
2) Remove the rear side belt. <Ref. to ME(w/o STI)-
38, REAR SIDE BELT, REMOVAL, V-belt.>
3) Remove the crank pulley. <Ref. to ME(w/o STI)-
4) Remove the timing belt cover. <Ref. to ME(w/o
STI)-47, REMOVAL, Timing Belt Cover.>
5) Remove the timing belt. <Ref. to ME(w/o STI)-
6) Remove the cam sprocket. <Ref. to ME(w/o
STI)-57, REMOVAL, Cam Sprocket.>
7) Disconnect the connector from the oil flow con-
trol solenoid valve.
8) Remove the timing belt cover No. 2 RH (A) and
timing belt cover No. 2 LH (B).
NOTE:
When removing the timing belt cover, be careful not
to damage the seal rubber.
9) Remove the tensioner bracket.
10) Remove the clip (A) and the stay (B) which hold
the engine harness to the rocker cover RH.
11) Remove the air duct B (B) from the rocker cov-
er LH and the air duct A (A).
12) Remove the ignition coil. <Ref. to IG(w/o STI)-
ME-05977
ME-04836
(B)
(A)
ME-04984
ME-04652
(A)
(B)
ME-04965
(B)
(A)
ME(w/o STI)-60
Camshaft
MECHANICAL
13) Disconnect the PCV hose (A) and PCV hose
assembly (B) from the rocker cover.
NOTE:
Pinch the clamp of the PCV hose (A) by fitting the
cut out in the ST with the protrusion on the clamp as
shown in the figure, and unlock the clamp.
ST 18353AA000 CLAMP PLIERS
14) Remove the rocker cover.
15) Remove the union bolt without filter (without
protrusion) which secures the oil pipe to the front
camshaft cap.
16) Loosen the upper side of the front camshaft cap
and the intake camshaft cap bolts equally, a little at
a time in alphabetical sequence shown in the figure.
ME-04374
ST
ME-05768
(A)
(B)
(A)
(B)
(A) Union bolt with filter (with protrusion)
(B) Union bolt without filter (without protrusion)
(C) Oil pipe RH
(D) Oil pipe LH
(E) Gasket
ME-05030
(A)
(B)
(D)
(A)
(B)
(C)
(E)
(E)
(E)
(E)
(E)
ME-05978
(A)
(B)
(A)
(E)
(F)
(B)
(D)
(C)
(E)
(F)
(D)
(C)
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