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Home >> Jeep >> 1988 >> Comanche Eliminator, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 4.0L 6-CYL - VIN [M] & 4.2L 6-CYL - VIN [C] >> Lubrication >> Oil Pump >> Disassembly & Inspection

Disassembly & Inspection

  1. Disassemble pump. See Figure. Use feeler gauge and straightedge to check gear end clearance. Place straightedge across gears and pump body. Using feeler gauge, determine thickness feeler gauge which fits snugly between straightedge and gears.
  2. With gears installed in pump body, insert feeler gauge between gear tooth and inner wall of pump body to check gear-to-body clearance. Rotate gears and measure clearance at each gear tooth.
  3. Compare measurements to specification. See OIL PUMP SPECIFICATIONS table. Repair as necessary if not within specifications. Check pressure regulator valve for wear or binding in pump body. Replace components if wear or binding exists.
OIL PUMP SPECIFICATIONS

Application In. (mm)
Gear End Clearance .004-.008 (.10-.20)
Gear-to-Body Clearance .002-.004 (.05-.10)
CAUTION: If pressure regulator valve is replaced, ensure replacement valve is the same diameter as that removed. Different diameter valves may be used.
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