Separate the cover from the body.
Remove the drive shaft and the drive gear of the oil pump.
Wash the pump body with gasoline.
If the oil pump parts are heavily contaminated, remove the oil receiver, take out the mesh filter of the oil receiver and clean it.
Check the gap between the gear teeth, which should be 0.05 mm (maximum permissible 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.
Checking the oil pressure in the lubrication system
Disconnect the wires from the oil pressure sensor, remove the sensor and screw in the fitting of the control pressure gauge hose in its place.
Start the engine and let it run until the oil temperature reaches 80°C.
Measure the oil pressure at idle and at a crankshaft speed of 2000 rpm, which should be equal to 0.3±0.15 and 2.0±0.2 kg/cm², respectively.
Remove the control pressure gauge, put the oil pressure sensor back in place and connect the wires to it.
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