INJECTOR-FUEL 2389329 - Caterpillar

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Remove the oil pump from the engine. Remove the cover of the oil pump.
Remove the outer rotor (1). Clean all of the parts. Look for cracks in the metal or other damage.
Install the outer rotor. Measure the clearance of the outer rotor to the body .
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Clearance for the inner rotor body
Measure the clearance of the inner rotor to the outer rotor (2).
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End play measurement of the rotor
Measure the end play of the rotor with a straight edge and a feeler gauge (3).
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.