For 1990-2009 cars

### Cleaning Procedure

1. Clean the oil pump components with non-corrosive solvent.

Warning: Refer to Safety Glasses Warning in the Preface section.

2. Dry the oil pump components with compressed air.

### Inspection Procedure

Note: There are no serviceable components within the oil pump. Disassemble the pump only to diagnose an oiling concern. A disassembled oil pump must not be reused. A disassembled oil pump must be replaced.

1. Inspect the oil pump housing for the following:

• | Damage, scoring, or debris on the housing surface for the driven gear (1)

• | Damage to the oil pump mounting bosses (2)

• | Damage, scoring, or debris on the housing surface for the drive gear (3)

• | Damage, scoring, or debris in the oil pump relief valve port (4)

• | Damage, scoring, or debris in the oil pump intake port (5)

• | Damage, scoring, or debris in the oil pump relief valve bore (6)

• | Damage, scoring, or debris in the oil pump output port (7)

• | Damage to the threads in the oil pump housing for the oil pump cover bolts (8)

2. Inspect the oil pump cover for the following conditions:

• | Damage to the oil pump cover mounting bosses (1)

• | Damage, scoring, or debris in the oil pump cover oil passages (2)

• | Damage to the sealing surface between the oil pump cover and the oil pump housing (3)

3. Inspect the inner drive gear for damage. If inner diameter damage is found, ensure the crankshaft is also inspected.
4. Inspect the outer driven gear for damage.
5. Inspect the oil pump relief valve components for debris or damage.
6. Inspect the primary camshaft drive chain lower guide for damage (1-3).
7. If debris or damage is present within the oil pump, further inspection of all of the engine components is necessary.