Subaru Impreza 2003 Service Manual page 271

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)
NOTE:
Valve rocker arms, rocker shaft and shaft supports
have identification marks. Ensure the parts with
same markings are properly assembled.
3) Install the valve rocker shaft securing bolts.
E: INSPECTION
1. VALVE ROCKER ARM AND ROCKER
SHAFT
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)
VALVE ROCKER ASSEMBLY
ME-00256
ME-00257
ME(H4SO)-59
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) If cam 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.
MECHANICAL