Subaru IMPREZA 2002 Service Manual page 154

VALVE ROCKER ASSEMBLY
MECHANICAL
E: INSPECTION
1. VALVE ROCKER ARM
1) Measure the inside diameter of valve rocker arm
and outside diameter of valve rocker shaft, and de-
termine the difference between the two (= oil clear-
ance).
Clearance between arm and shaft:
Standard
Limit
0.020
-
0.054 mm (0.0008
-
0.0021 in)
0.10 mm (0.0039 in)
/ /
B2M0072
2) If the oil clearance exceeds the limit, replace the
valve rocker arm or shaft, whichever shows greater
amount
o f
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 ) Measure the inside diameter of rocker shaft sup-
port and outside diameter of valve rocker shaft, and
determine the difference between the two (= oil
clearance).
Clearance between support and shaft:
Standard
Limit
0.005
-
0.039 mm (0.0002
-
0.0015 in)
0.05 mm (0.0020 in)
4) If the oil clearance exceeds the limit, replace the
rocker shaft support or shaft, whichever shows
greater amount of wear.
Rocker shaft support inside diameter:
22.005
-
22.026 mm (0,8663
-
0.8672 in)
Rocker shaft diameter:
21.987
-
22.000 mm (0.8656
-
0.8661 in)
5 ) If the cam or valve contact surface
of
valve rock-
er arm is worn or dented excessively, replace the
valve rocker arm.
6) Check that the valve rocker arm roller rotates
smoothly. If not, replace the valve rocker arm.
ER SHAFT
Visually check the oil relief valve
o f
shaft end for
any of the following abnormalities:
Breaks in check ball body
Foreign particles caught in valve spring
Oil leakage at check ball
CAUTION:
Repair or replace the valve rocker shaft as nec-
essary.
2. INTAKE AND EXHAUST VALVE ROCK-
M E(S0HC)-56