28. Oil Pump Inspection

Oil Pump Inspection





1. 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.

Measure the depth of the oil pump body gear cavity at dimension A.

The gear cavity maximum depth is 24.940 mm (0.9819 inch).





2. Measure the ID of the oil pump body gear cavity at dimension A.

The gear cavity maximum ID is 109.191 mm (4.2989 inch).





3. Measure the OD of the driven gear at dimension A.

The driven gear minimum OD is 108.987 mm (4.2908 inch).





4. Measure the distance between the flats of the drive gear at dimension A.

The maximum distance between the flats is 52.165 mm (2.0537 inch).





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. Measure the clearance between the driven gear (1) and the oil pump body (2), driven gear diametrical clearance.

The driven gear maximum diametrical clearance is 0.20 mm (0.0080 inch).





8. Measure the clearance between the driven gear (1) and the oil pump body crescent (2).

The driven gear/crescent maximum clearance is 0.455 mm (0.0179 inch).





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.

The drive gear maximum side clearance is 0.066 mm (0.0026 inch).

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.

The driven gear maximum side clearance is 0.050 mm (0.0022 inch).





11. Remove the drive gear (1) and driven gear (2) from the oil pump body (3).

Oil Pump Wear Plate Inspection





1. Important:
Replace the oil pump wear plate if specifications are not met.

Inspect the wear plate (1) for damage. The wear plate must not be scored, nicked, or grooved.
2. Measure the thickness of the wear plate in the gear wear area.

The thickness of the wear plate must not be less than 2.950 mm (0.116 inch).