Separate the cover from the body.
Remove the drive shaft and oil pump drive gear.
Wash the pump housing with gasoline.
If the oil pump parts are very dirty, remove the oil receiver, remove the oil receiver strainer and clean it.
Check the gap between the gear teeth, which should be 0.05 mm (maximum allowable 0.20 mm), and the gap between the outer diameter of the gears and the bore of the oil pump housing, which should be 0.15 mm.
Measuring the gap between the gear teeth and the gap between the outer diameter of the gear and the bore of the oil pump housing
Assemble the oil pump in the reverse order of disassembly.
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