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Home >> Infiniti >> 2003 >> QX4 4WD >> Repair and Diagnosis >> Transmission >> Transfer Case >> Repair For Component Parts >> Center Case >> Inspection >> Main Oil Pump

Main Oil Pump

  1. Check inner and outer circumference, tooth face, and side-face of inner and outer gears for damage or abnormal wear.
  2. Measure side clearance between oil pump housing edge and inner gear/outer gear.
  3. Make sure side clearance is within specification. If the measurement is out of specification, replace inner and outer gears with new ones as a set.

    Specification: 0.015 - 0.035 mm (0.0006 - 0.00014 in) 

    For inner gear and outer gear,  refer to INNER GEAR AND OUTER GEAR  under SERVICE DATA AND SPECIFICATIONS (SDS).

    Fig 1: Measuring Side Clearance Between Oil Pump Housing Edge And Inner Gear/Outer Gear
    G02209606Courtesy of NISSAN MOTOR CO., U.S.A.
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