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Oil Pump Inspection: Notes

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    Fig 1: Measuring Depth Of Oil Pump Body Gear Cavity
    GM1645507Courtesy of GENERAL MOTORS CORP.
    IMPORTANT:
    • Make the following measurements described below at several locations.
    • Replace the oil pump body, driven gear and drive gear if any of the following specifications are not met.
  1. Measure the depth of the oil pump body gear cavity at dimension A.

    Specification:  The gear cavity maximum depth is 22.245 mm (0.8758 in).

    2. Fig 2: Measuring Inside Diameter Of Oil Pump Body Gear Cavity
    GM1645509Courtesy of GENERAL MOTORS CORP.
  2. Measure the ID of the oil pump body gear cavity at dimension A.

    Specification:  The gear cavity maximum ID is 110.216 mm (4.3392 in).

    3. Fig 3: Measuring Outside Diameter Of Oil Pump Driver Gear
    GM1587643Courtesy of GENERAL MOTORS CORP.
  3. Measure the OD of the driven gear at dimension A.

    Specification:  The driven gear minimum OD is 109.987 mm (4.3302 in).

    4. Fig 4: Measuring Distance Between Flats Of Drive Gear
    GM1587644Courtesy of GENERAL MOTORS CORP.
  4. Measure the distance between the flats of the drive gear at dimension A.

    Specification:  The maximum distance between the flats is 52.165 mm (2.0537 in).

    5. Fig 5: Drive Gear & Driven Gears
    GM1587645Courtesy of GENERAL MOTORS CORP.
  5. Align the drive gear (1) and driven gear (2) with the oil pump so that their punch marks are in the same position as when they were originally removed.
  6. Install the gears into the oil pump body (3).
    7. Fig 6: Measuring Driven Gear To Oil Pump Body Clearance
    GM1587646Courtesy of GENERAL MOTORS CORP.
  7. Measure the clearance between the driven gear (1) and the oil pump body (2), driven gear diametrical clearance.

    Specification:  The driven gear maximum diametrical clearance is 0.23 mm (0.009 in).

    8. Fig 7: Measuring Driven Gear To Oil Pump Body Crescent Clearance
    GM1587649Courtesy of GENERAL MOTORS CORP.
  8. Measure the clearance between the driven gear (1) and the oil pump body crescent (2).

    Specification:  The driven gear/crescent maximum clearance is 0.26 mm (0.010 in).

    9. Fig 8: Measuring Drive Gear Side Clearance
    GM1587650Courtesy of GENERAL MOTORS CORP.
  9. Hold a straight edge across the oil pump body (1) and the drive gear (3). Measure the clearance between the drive gear and the straight edge. This is the drive gear side clearance.

    Specification:  The drive gear maximum side clearance is 0.074 mm (0.0029 in).

  10. Hold a straight edge across the oil pump body (1) and the driven gear (2). Measure the clearance between the driven gear and the straight edge.

    Specification:  The driven gear maximum side clearance is 0.074 mm (0.0029 in).

    11. Fig 9: Drive Gear & Driven Gears
    GM1587645Courtesy of GENERAL MOTORS CORP.
  11. Remove the drive gear (1) and driven gear (2) from the oil pump body (3).
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