Isuzu 4LE2, Workshop Manual

Page: 53 / 121

50
ENGINE
Inspect all disassembled parts for wear, damage and any
abnormalities.
Rocker Arm Shaft Outside Diameter
Use a micrometer to measure the rocker arm outside
diameter.
If the measured value is less than the specified limit, the
shaft must be replaced.
mm (in)
Standard Limit
Rocker Arm Shaft 11.935 – 11.955 11.85
Diameter (0.4699 – 0.4707) (0.4665)
Rocker Arm Shaft and Rocker Arm Clearance
1. Use a vernier caliper to measure the rocker arm
bushing inside diameter.
mm (in)
Standard
Rocker Arm Bushing 11.960 – 11.980
Inside Diameter (0.4709 – 0.4717)
2. Measure the rocker arm shaft outside diameter.
Replace either the rocker arm or the rocker arm shaft
if the clearance exceeds the specified limit.
mm (in)
Standard Limit
Rocker Arm Bushing
and Rocker Arm
0.005 – 0.045 0.2
Shaft Clearance
(0.0002 – 0.0018) (0.0079)
3. Check that the rocker arm oil port is free of obstruc-
tions.
If necessary, use compressed air to clean the rocker
arm oil port.
7. ROCKER ARM SHAFT AND ROCKER ARM
Fig. 85
Fig. 86
Fig. 87
Fig. 88