Inspection Procedure

Fig 1: Identifying Oil Pump Components

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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.

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)
Fig 2: Identifying Oil Pump Cover Mounting Bosses And Oil Pump Housing
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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)
  
  Fig 3: Locating Inner Drive Gear For Damage
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Inspect the inner drive gear for damage. If inner diameter damage is found, ensure the crankshaft is also inspected.

Fig 4: Locating Outer Driven Gear For Damage
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Inspect the outer driven gear for damage.

Fig 5: Locating Oil Pump Relief Valve Components
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Inspect the oil pump relief valve components for debris or damage.

Fig 6: Identifying Primary Camshaft Drive Chain Lower Guide For Damage
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Inspect the primary camshaft drive chain lower guide for damage (1-3).
If debris or damage is present within the oil pump, further inspection of all of the engine components is necessary.