47. Oil Pump Clean and Inspect

Oil Pump Cleaning and Inspection





Important: If the oil pump is found to be damaged, or excessively worn replace the oil pump as an assembly.

1. Inspect the following for excessive wear or damage:
- The oil pump outer gear
- The oil pump inner gear
- The oil pump cover
- The oil pump body
2. Measure the radial clearance between the oil pump outer gear and the oil pump body using a feeler gage.
Replace the oil pump if the clearance exceeds 0.15 mm (0.0059 inch).





3. Measure the side clearance between the oil pump gears and a straightedge using a feeler gage.
Replace the oil pump if the clearance exceeds 0.11 mm (0.0043 inch).





4. Measure the free length of the oil pressure relief spring.
Replace the spring if the free length is less than 63.5 mm (2.5 inch).





5. Measure the oil pressure relief spring tension. Replace the spring if the tension is less than 86.0 Newtons at 52 mm (62 lb. at 2.05 inch).

Oil Pump Assemble





1. Lubricate the following with clean engine oil.
- The oil pump inner gear
- The oil pump outer gear
- The inside surface of the oil pump body
2. Install the oil pump outer and inner gears to the oil pump body.

Notice: Fill oil pump cavities with petroleum jelly prior to installation. This will ensure that there is oil pressure immediately on start-up and will prevent engine damage.

3. Fill the oil pump with petroleum jelly to prime the oil pump.

Notice: Refer to Fastener Notice in Service Precautions.

4. Install the relief valve (3), the spring (2) and the retainer (1).
- Tighten the retainer to 29 Nm (21 ft. lbs.).
5. Install the oil pump cover to the oil pump body. Secure the cover with 5 bolts.
- Tighten the bolts to 12 Nm (9 ft. lbs.).