Removal

1. Remove oil filter.
2. Remove screws attaching oil pump cover assembly to timing chain cover. Remove cover assembly and slide out oil pump gears.
3. Wash off gears and inspect for wear, scoring, etc. Replace any gears not found serviceable.

Fig. 13 Oil pump cover and relief valve exploded view:

4. Remove the oil pressure relief valve cap, spring and valve. Oil filter by-pass valve and spring are staked in place and should not be removed.
5. Wash the parts thoroughly and inspect the relief valve for wear or scoring. Check the relief valve spring to see that it is not worn on its side or collapsed. Replace any relief valve spring that is questionable.
6. Check the relief valve in its bore in the cover. The valve should have no more clearance than an easy slip fit. If any perceptible side shake can be felt the valve and/or cover should be replaced.
7. Check filter by-pass valve for cracks, nicks, or warping. The valve should be flat and free of nicks or scratches.