Cleaning & Inspection

WARNING: This page does not describe the selected car, but rather 36 other vehicles, including the 1986 Jeep Wagoneer, 1986 Jeep Pickup, 1986 Jeep Grand Wagoneer, 1986 Jeep Comanche, and 1986 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

Clean all pump components (except drive shaft seal) in clean solvent and blow dry. Inspect flow control valve assembly for wear, scoring, burrs or other damage.
Check all machined surfaces of body for scratches or burrs which might allow leaks. Mating surfaces on "O" rings require special attention. Inspect pump body drive shaft bushing for excessive wear.
If replacement is required, replace pump body and bushing as an assembly. Inspect end cover for nicks and burrs on surface for "O" ring, then polish with a fine oil stone if necessary.
Inspect rotor ring for roughness or irregularities. Use a small oil stone to correct minor irregularities and replace ring if outside cam surface is badly worn or scored. Check thrust plate and pressure plate for scoring and wear.
To remove light scoring, carefully lap with crocus cloth until surface is smooth and flat. Clean surface thoroughly. Check fit of vanes in rotor to ensure that they slide freely but fit snugly into slots.
If vanes are excessively loose in slots, rotor and/or vanes require replacement. Scoring on rotor may be removed by careful lapping using crocus cloth, and then cleaning thoroughly.