Oil Pump

Cleaning

Wash all parts in a solvent and dry them thoroughly with compressed air. Use a brush to clean the inside of the pump housing and the pressure relief valve chamber. Ensure all dirt and metal particles are removed.

Inspection

Tools Required:

• Straight Edge D83L-4201-A

Refer to Specifications in Section 03-01A (2.3L) or Section 03-01B (5.0L) for clearances and service limits.

Check the inside of the pump housing and the inner and outer gears for damage or excessive wear.

Check the mating surface of the pump cover for wear. Minor scuff marks are normal, but if the cover, gears or housing surfaces are excessively worn, scored or grooved, replace the pump. Inspect the rotor for nicks, burrs or score marks. Remove minor imperfections with an oil stone.

Measure the inner to outer rotor tip clearance.

With the rotor assembly installed in the housing, place a straightedge over the rotor assembly and the housing.

Measure the vertical clearance (rotor end play) between the straightedge and both the inner rotor and the outer race. Maximum clearance must not exceed 0.13mm (0.005 inch).

Inspect the relief valve spring to see if it is collapsed or worn. Check the relief valve spring tension. If the spring tension is not within specification and/or the spring is worn or damaged, replace the pump. Check the relief valve piston for free operation in the bore.

NOTE: Internal components are not serviced. If any component is out of specification, the pump assembly must be replaced.