Inspection And Repair; Cylinder Head - Isuzu 4JA1 Workshop Manual

Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is discovered during
inspection.

INSPECTION AND REPAIR

CYLINDER HEAD

Cylinder Head Lower Face Warpage
1. Use a straight edge and a feeler gauge to measure the
four sides and the two diagonals of the cylinder head lower
face.
2. The cylinder head lower surface warpage is more than the
limit, it should be replaced.
011RY00012
Cylinder Head Lower Face Warpage (A-F)
NOTE:
The cylinder head lower face cannot be reground.
011RY00013
Cylinder Head Height (H) (Reference)
011RY00014
Positive Crankcase Ventilation (PCV) Valve
1. Remove PCV valve assembly from cylinder head cover.
2. Inspect the diaphragm for broken.
3. Inspect the spring for broken or weaken.
4. If find any abnormal condition, replace the PCV valve
assembly.
ENGINE MECHANICAL 6A – 61
Standard
0.05
(0.002) or less
Standard
91.95 – 92.05
(3.620 – 3.624)
mm (in)
Limit
0.20
(0.0079)
mm (in)