Bold reference numbers in this section identify parts not shown in the figures alongside the text, but which can be found in the exploded view diagram.

Remove the oil pump assembly (1) and extract the O-rings (2) and (4) from the crankcase half together with two locating bushes (15).

Remove the circlip (6), slide off the bush (13) and the circlip (3).

Fit on the oil pump the pump drive gear (12), the circlip (3) and the bush (13).

Insert in the pump the by-pass valve (17), the spring (16) and screw the plug (14) and tighten the plug (3) to a torque of 17 Nm (Min. 15 Nm - Max. 19 Nm) Sect.  3 - 3, Engine torque settings) by applying a threadlocker of medium strength.

Position the reference bushings (15) and the oil sealing O-rings (2) and (4) according to the crankcase lubrication channels.

Place the oil pump (1) on the crankcase and tighten the screws (9) to a torque of 26 Nm (Min. 23 Nm - Max. 29 Nm) and the screw (10) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm) (Sect.  3 - 3, Engine torque settings).

The clearance should be 0.10 mm.