2.1 - | Lubrication system: oil pump

1 | Oil pump complete with gear

2 | O-ring

3 | By-pass plug

4 | O-ring

5 | By-pass valve

6 | Locating bush

7 | Reducer bush

8 | Spring washer

9 | Screw

10 | Screw

11 | Spring washer

12 | By-pass spring

Parts catalogue

Filters and oil pump

Important
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.
Removal of the oil pump

Operation | Section reference
Remove the clutch-side crankcase cover | N 6.2, Removal of the clutch-side crankcase cover

Undo and remove the screws (9) and (10) securing the pump assembly.
Remove the oil pump assembly (1) and extract the O-rings (2) and (4) from the crankcase half together with two locating bushes (6).
Disassembly of the oil pump
Hold the oil pump (1) in a vice taking care not to damage the drive gear (A).
Warning
Make sure that vice jaws are faced with soft material.
Remove the plug (3) and extract the spring (12) and by-pass valve (5).
Check the condition of the above components.
Reassembly of the oil pump
Install in the pump the by-pass valve (5) and the spring (12); screw in the plug (3) and tighten to the specified torque (Sect. C 3, Engine torque settings) after applying a medium strength threadlocker.
Refitting the oil pump
Position the locating bushes (6) and the O-rings (2) and (4) in correspondence with the crankcase lubrication oilways.
Position the oil pump (1) on the crankcase and tighten the screws (9) and (10) to the specified torque (Sect. C 3, Engine torque settings).
Check the gear backlash with the driving gear by fixing a dial gauge, equipped with the appropriate stylus, to the crankcase half.
Position the dial gauge stylus on one tooth of oil pump gear and set the gauge to zero in this position.
Move the gear slightly to measure the backlash; take four readings in diametrically opposed positions of the gear.
The backlash should be 0.10 mm.

Operation | Section reference
Refit the clutch-side crankcase cover | N 6.2, Refitting the clutch-side crankcase cover