Isuzu NKR 4J Series - Oil Pump Inspection and Repair

6A – 28 GENERAL ENGINE MECHANICAL
4. Oil Pump Assembly
5. Strainer
6. Pump Cover
7. Driven Gear
8. Oil Pump Body
INSPECTION AND REPAIR
Make the necessary adjustment, repairs, and part
replacements if excessive wear or damage is discovered
during inspection.
Body and gears
The pump assembly must be replaced if one or more of
the conditions below is discovered during inspection.
• Badly worn or damaged driven gear guide.
• Badly worn or damaged gear teeth.
Gear Teeth and Body Inner Wall Clearance
• Use a feeler gauge to measure the clearance between
the gear teeth and the body inner wall.
• If the clearance between the gear teeth and the body
inner wall exceeds the specified limit, either the gear
or the body must be replaced.
Gear Teeth and Body
Internal Wall Clearance mm (in)
Standard Limit
0.14 (0.0055) 0.20 (0.0079)
Gear and Body Clearance
• Use a feeler gauge to measure the clearance between
the body and the gear.
• If the clearance between the gear and the body
exceeds the specified limit, the body must be
replaced.
Gear and Body Clearance mm (in)
Standard Limit
0.06 (0.024) 0.15 (0.0059)
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