Lubrication system: oil pump

2.1 -

Lubrication system: oil pump

1	Complete oil pump assembly

2

3

4

5

6

7	Reducer bush

8	Spring washer

9

10

11	Spring washer

12	Pump drive gear

13

14	By-pass plug

15	Locating bush

16	By-pass spring

17	By-pass valve

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
Drain the engine oil	D 4, Changing the engine oil and filter cartridge
Disconnect the oil pressure sensor	P 5, Checking the indicating devices
Remove the clutch-side crankcase cover	N 6.2, Removal of the clutch-side crankcase cover

Undo and remove the bolts (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 (15).

Disassembly of the oil pump

Hold the oil pump (1) in a vice taking care not to damage the drive gear (12).

Warning

Make sure that vice jaws are faced with soft material.

Remove the plug (14) and extract the spring (16) and by-pass valve (17).

Check the condition of the above components.

Check the condition of the above components.

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

Slide out the pump drive gear (12).

Reassembly of the oil pump

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

Secure the components installed by inserting the circlip (6) in its groove.

Install in the pump the by-pass valve (17) and the spring (16); screw in the plug (14) and tighten to the specified torque (Sect. C 3, Engine torque settings) after applying a medium strength threadlocker.

Fit the cover (2) to the pump body (5) complete with the gears.

Refitting the oil pump

If removed, apply the recommended threadocker to the bush (7) and screw it into the crankcase half by the specified amount.

Position the locating bushes (15) 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 bolts (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, Reassembly of the clutch-side crankcase cover
Connect the oil pressure sensor	P 5, Checking the indicating devices
Top up the engine oil	D 4, Changing the engine oil and filter cartridge