Push Rod Curvature; Tappet And Cylinder Body Clearance; Camshaft; Camshaft Journal Diameter - Isuzu A-4JA1 Workshop Manual

ENGINE ASSEMBLY ( 2 )
62
X
Y Y
X

Tappet and Cylinder Body Clearance

Standard
0.03 (0.0012)

Push Rod Curvature

1. Lay the push rod on a surface plate.
2. Roll the push rod along the surface plate and mea-
sure the push rod curvature with a thickness gauge.
If the measured value exceeds the specified limit,
the push rod must be replaced.
Push Rod Curvature
3. Visually inspect both ends of the push rod for
excessive wear and damage. The push rod must be
replaced if these conditions are discovered during
inspection.

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 ((X – X) and (Y – Y)). If the
measured value is less than the specified limit, the
camshaft must be replaced.
Camshaft Journal Diameter
Standard
49.945 – 49.975
(1.9663 – 1.9675)
Limit
0.1 (0.0039)
Limit
0.3 (0.012)
Limit
49.60
(1.953)
mm(in)
mm(in)
mm(in)