Subaru Impreza 2002 Service Manual page 934

18.Valve Rocker Assembly
A: REMOVAL
1) Remove the V-belt. <Ref. to ME-44, REMOVAL,
V-belt.>
2) Remove the crankshaft pulley. <Ref. to ME-46,
REMOVAL, Crankshaft Pulley.>
3) Remove the belt cover. <Ref. to ME-48, RE-
MOVAL, Belt Cover.>
4) Remove the timing belt assembly. <Ref. to ME-
49, REMOVAL, Timing Belt Assembly.>
5) Remove the camshaft sprocket. <Ref. to ME-54,
REMOVAL, Camshaft Sprocket.>
6) Disconnect the PCV hose and remove rocker
cover.
7) Removal of valve rocker assembly
(1) Remove the bolts (a) through (h) in alpha-
betical sequence.
CAUTION:
Leave two or three threads of bolts (g and h) en-
gaged to retain the valve rocker assembly.
(2) Remove the valve rocker assembly.
B: INSTALLATION
1) Installation of valve rocker assembly
(1) Temporarily tighten the bolts (a) through (d)
equally as shown in the figure.
CAUTION:
Do not allow the valve rocker assembly to
gouge knock pins.
(2) Tighten the bolts (e) through (h) to specified
torque.
VALVE ROCKER ASSEMBLY
B2M2605F
B2M2606
ME-57
(3) Tighten the bolts (a) through (d) to specified
torque.
Tightening torque:
25 N·m (2.5 kgf-m, 18.1 ft-lb)
2) Adjust the valve clearances. <Ref. to ME-32,
ADJUSTMENT, Valve Clearance.>
3) Install the rocker cover and connect PCV hose.
4) Install the camshaft sprocket. <Ref. to ME-54,
INSTALLATION, Camshaft Sprocket.>
5) Install the timing belt assembly. <Ref. to ME-50,
INSTALLATION, Timing Belt Assembly.>
6) Install the belt cover. <Ref. to ME-48, INSTAL-
LATION, Belt Cover.>
7) Install the crankshaft pulley. <Ref. to ME-46, IN-
STALLATION, Crankshaft Pulley.>
8) Install the V-belt. <Ref. to ME-44, INSTALLA-
TION, V-belt.>
C: DISASSEMBLY
1) Remove the bolts which secure rocker shaft.
2) Extract the rocker shaft. Remove the valve rock-
er arms, springs and shaft supports from rocker
shaft.
CAUTION:
Arrange all removed parts in order so that they
can be installed in their original positions.
3) Remove the nut and adjuster screw from valve
rocker.
D: ASSEMBLY
1) Install the adjuster screw and nut to valve rocker.
2) Arrange the valve rocker arms, springs and shaft
supports in assembly order and insert valve rocker
shaft.
Tightening torque (Shaft supports installing
bolts):
5 N·m (0.5 kgf-m, 3.6 ft-lb)
CAUTION:
Valve rocker arms, rocker shaft and shaft sup-
ports have identification marks. Ensure the
parts with same markings are properly assem-
bled.
3) Install the valve rocker shaft securing bolts.
MECHANICAL
B2M2605A