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Isuzu 4ja1 - Inspection and Repair; Cylinder Head

Isuzu 4ja1
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ENGINE MECHANICAL 6A – 61
INSPECTION AND REPAIR
Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is discovered during
inspection.
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.
Cylinder Head Lower Face Warpage (A-F) mm (in)
Standard Limit
0.05
(0.002) or less
0.20
(0.0079)
NOTE:
The cylinder head lower face cannot be reground.
Cylinder Head Height (H) (Reference) mm (in)
Standard
91.95 – 92.05
(3.620 – 3.624)
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.
011RY00012
011RY00013
011RY00014

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