Rocker-arm shaft and rocker arms
Wear:
Check these parts for wear and, as necessary, replace them.
The extent of wear is determined on the basis of two readings,
one on rocker arm I.D. and the other on shaft diameter.
NOTE:
Use a micrometer on rocker-arm shaft and a bore gauge
rocker arm. The difference between the two readings is the
arm-to-shaft clearance on which a limit is specified. If the
limit is exceeded, replace shaft or arm, or both.
Rocker-arm shaft deflection:
Using “V” blocks and a dial gauge, check the shaft for straight-
ness in terms of deflection.
If the limit is exceeded, replace it.
Wear of rocker-arm and adjusting screw:
If the tip (1) of adjusting screw (2) is badly worn, replace the
screw. The arm must be replaced if its cam-riding face (3) is
badly worn.
Visually examine each rocker-arm spring for evidence of break-
age or weakening. Be sure to replace springs found in bad condi-
tion.
6A-20
ENGINE MECHANICAL (F8B ENGINE)
Item
Standard
Limit
Rocker arm I.D.
15.000 – 15.018 mm
(0.590 – 0.591 in.)
–––––
Rocker arm shaft dia.
14.983 – 14.994 mm
(0.589 – 0.590 in.)
–––––
Arm to shaft clearance
0.006 – 0.035 mm
0.070 mm
Arm-to-shaft clearance
(0.0002 – 0.0014 in.)
(0.0028 in.)
Deflection limit
0.06 mm (0.0024 in.)
