Subaru Impreza 2002 Service Manual page 935

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
0.020 — 0.054 mm (0.0008 — 0.0021 in)
Limit
0.10 mm (0.0039 in)
2) If oil clearance exceeds the limit, replace the
valve rocker arm or shaft, whichever shows 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) 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
0.005 — 0.039 mm (0.0002 — 0.0015 in)
Limit
0.05 mm (0.0020 in)
VALVE ROCKER ASSEMBLY
B2M0072
B2M0073
ME-58
4) If 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 cam or valve contact surface of valve rocker
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.
2. INTAKE AND EXHAUST VALVE ROCK-
ER SHAFT
Visually check the oil relief valve of 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.