Removal
Removing the oil pump is possible without removing the engine.
Remove the rear engine cover (see section "Removal and installation the rear engine cover").
Remove the V-belt pulley (see section "Replacing V-belt pulleys").
Remove the protective cover under the V-belt pulley.
Unscrew the 4 nuts securing the oil pump cover.
Remove the oil pump cover together with the sealing gasket and take out the gears.
Lightly tap with a rubber hammer to remove the oil pump housing.
Examination
Before installation, check the wear of the oil pump housing and gear bearing journals. Worn surfaces in the housing lead to loss of oil pressure.
Check the rigidity of the fit of the short gear shafts installed in the housing; replace the housing if necessary.
Check the axial play of the oil pump gears. To do this, place a steel ruler on the body and use a feeler gauge to check the gap. It should not exceed 0.1 mm.
Check the pump cover for signs of wear; sand down or replace the worn out cover.
Check the mounting surface on the crankcase for the oil pump housing for damage and cleanliness.
Installation
Install the oil pump housing with a new gasket and insert the gears.
Turn the crankshaft two revolutions so that the camshaft makes one revolution and sets the gears in motion. This will ensure that the gears are centered in the pump body.
Install the pump cover with a new sealing gasket and tighten the M8 nuts to a torque of 25 Nm (2.5 kgfm), without changing the position of the pump body.
Install a protective cover under the V-belt pulley.
Install the V-belt pulley.
Install the rear engine cover.
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