Remove the engine oil sump.
Loosen the oil pump mounting bolts with a socket wrench and remove it.
Dismantle the oil pump and pump pressure reducing valve and wash all parts in gasoline.
Check the degree of wear of parts, replace worn parts.
Wipe dry both gears and install them in the pump housing.
Using a feeler gauge, check the gap between the gear teeth, which should be in the range of 0.10-0.20 mm.
Using a feeler gauge and a curved ruler, check the gap between the ends of the gears and the plane of the pump housing, which should be within 0.04-0.10 mm.
Replace pump cover with obvious signs of wear.
Lubricate the gears liberally with engine oil and install them at the same time as the pump cover, using a new gasket.
Install the oil pump on the cylinder block.
Install the engine oil sump.
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