Isuzu 4ja1, Workshop Manual

Page: 99 / 564

ENGINE MECHANICAL 6A – 77
CAMSHAFT
Visually inspect the journals, the cams, the oil pump drive gear,
and the camshaft bearings for excessive wear and damage.
The camshaft and the camshaft bearings must be replaced if
these conditions are discovered during inspection.
Camshaft Journal Diameter
Use a micrometer to measure each camshaft journal diameter
in two directions (1 and 2). If the measured value is less than
the specified limit, the camshaft must be replaced.
Camshaft Journal Diameter mm (in)
Standard Limit
49.945 - 49.975
(1.9663 - 1.9675)
49.60 (1.953)
Cam Height
Measure the cam height (H) with a micrometer. If the
measured value is less than the specified limit, the camshaft
must be replaced.
Cam Height (H) mm (in)
Standard Limit
42.016 (1.6542) 41.65 (1.640)
Camshaft Run-Out
1. Mount the camshaft on V-blocks.
2. Measure the run-out with a dial indicator.
If the measured value exceeds the specified limit, the
camshaft must be replaced.
Camshaft Run-Out mm (in)
Standard Limit
0.02 (0.0008) 0.10 (0.004)
014RY00032
014RY00033
014LX092