Subaru 2009 IMPREZA, Service Manual

Page: 277 / 3619

ME(H4SO)-59
Valve Rocker Assembly
MECHANICAL
(2) Temporarily tighten the bolts in alphabetical or-
der shown in the figure, tighten them in two stages.
Tightening torque:
First
6.4 N·m (0.7 kgf-m, 4.7 ft-lb)
Second (only (a) and (b) are tightened)
6.4 N·m (0.7 kgf-m, 4.7 ft-lb)
RH side
LH side
(3) Connect the PCV hose.
6) Install the high tension cord.
C: DISASSEMBLY
NOTE:
Intake valve rocker assembly cannot be disassembled.
1) Remove the exhaust valve rocker arm from the
rocker shaft.
NOTE:
Keep all the removed parts in order for re-installing
in their original positions.
2) Remove the nut and adjusting screw from ex-
haust valve rocker.
D: ASSEMBLY
NOTE:
Intake valve rocker assembly cannot be disassembled.
1) Install the adjusting screw and nut to the exhaust
valve rocker.
2) Insert the exhaust valve rocker arm to rocker shaft.
NOTE:
Valve rocker arms, and rocker shaft have identifica-
tion marks. Make sure the parts with same mark-
ings are properly assembled.
E: INSPECTION
1. INTAKE VALVE ROCKER ASSEMBLY
1) If the roller or valve contact surface of valve
rocker arm is worn or dented excessively, replace
the valve rocker assembly.
2) Check that the valve rocker arm roller rotates
smoothly. If not, replace the valve rocker assembly.
2. EXHAUST VALVE ROCKER ASSEMBLY
1) Measure the inner diameter of valve rocker arm
and outer diameter of valve rocker shaft, and con-
firm the difference (oil clearance) between the two
values.
Clearance between arm and shaft:
Standard
0.020 — 0.054 mm (0.0008 — 0.0021 in)
2) If the oil clearance exceeds the limit, replace the
valve rocker arm or shaft, whichever shows the
greater amount of wear.
Rocker arm inside diameter:
22.020 — 22.041 mm (0.8669 — 0.8678 in)
Rocker shaft diameter:
21.987 — 22.000 mm (0.8656 — 0.8661 in)
3) If the roller or valve contact surface of valve
rocker arm is worn or dented excessively, replace
the valve rocker arm.
4) Check that the valve rocker arm roller rotates
smoothly. If not, replace the valve rocker arm.
ME-02715
(a)
(b)
(c)
(d)
(e)
(f)
ME-02716
(a)
(b)
(c)
(d)
(e)
(f)
ME-02706
ME-00257