For 1990-2009 cars

1. Clean all of the oil pump parts in solvent.
2. Inspect the pump cover housing for the following conditions:

• | Cracks

• | Scoring

• | Porous or damaged casting

• | Damaged threads

• | Excessive wear or galling

3. Inspect the pressure relief valve for damage. Replace the valve if the valve is damaged.
4. Inspect the gerotor for the following conditions:

• | Chipping

• | Galling

• | Excessive wear

5. Measure the following parts:

• | The gerotor cavity depth

• | The inner gerotor tip clearance

• | The outer gerotor diameter clearance

• | The gear dimensions

6. Replace the pump as an assembly if the housing or gears are worn beyond specifications.