C4.4 Industrial Engine Engine Oil Pump - Inspect Caterpillar

If any part of the oil pump is worn enough in order to affect the performance of the oil pump, the oil pump must be replaced.

Perform the following procedures in order to inspect the oil pump for clearances and torques.

Refer to the Specifications Module, "Engine Oil Pump".

1. Remove the oil pump from the engine. Refer to the Disassembly and Assembly, "Engine Oil Pump - Remove". Remove the cover of the oil pump.

2. Remove the outer rotor. Clean all of the parts. Look for cracks in the metal or other damage.
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   Illustration 1	g00985779
   Clearance for the outer rotor body (1) Measure the clearance of the outer rotor to the body.

3. Install the outer rotor. Measure the clearance of the outer rotor to the body (1).
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   Illustration 2	g00985780
   Clearance for the inner rotor (2) Measure the clearance of the inner rotor to the outer rotor.

4. Measure the clearance of the inner rotor to the outer rotor (2).
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   Illustration 3	g00989217

5. Measure the end play of the rotor with a straight edge and a feeler gauge (3).

6. Clean the top face of the oil pump and the bottom face of the cover. Install the cover on the oil pump. Install the oil pump on the engine. Refer to Disassembly and Assembly, "Engine Oil Pump - Install".