Remove the two bolts securing the oil pump cover to the housing.
Separate the cover from the body.
Remove drive shaft and oil pump drive gear.
Wash the pump housing with gasoline.
If the oil parts of the 1st pump are heavily contaminated, remove the oil receiver, remove the oil receiver strainer and clean it with it.
Check the gap between the teeth of the gears, which should be equal to 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 no more than 0.15 mm.
Assemble the oil pump in the reverse order of disassembly.
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