Norton Commando Workshop Manual

## Engine/Primary Transmission

# C

### SECTION C25

### SERVICING THE OIL PUMP

Removal of the oil pump is described in Section C16. The criterion of oil pump condition is the degree of end float on the oil pump pinions, most easily felt by movement of the oil pump driving gear relative to the pump body. After some period of use, the tendency is for the pinions to wear into the pump end covers and such wear can only be removed by taking off the covers and flattening down the actual pump body.
1 | Detach the pump top covers and drive gear with drive spindle by tapping the spindles through the keyed pinion with a pin point drift. The remaining parts can be lifted from the pump body at this stage.
2 | Wash all the components thoroughly in clean gasoline (petrol) and allow to dry.
It is most important to correct end float on the feed gears (the narrow ones) first.
3 | Remove the feed gears and rub down the back plate end of the pump body surface against a high grade quality emery cloth on a- perfectly flat surface such as a small surface plate. Flattening of the surface should continue a little at a time until the stage is reached where, on re-assembly of the oil pump, there is barely discernible stiffness on the oil pump driving spindle. This barely discernible stiffness will indicate that there is just suflicient freedom of movement and that there is no excess clearance between the feed gears and housing.
4 | Remove the feed gears and repeat the flattening down process on the return side of the pump body until with the return gears only in the pump body and the screws tight there is similar slight stiffness.
5 | Strip the pump body again and wash with very great care. Reassemble the pump and tighten the screws completely. At this stage there should be some degree of stiffness in the complete pump.
6 | Introduce oil into the feed hole then, holding the oil pump with one hand, place a ring spanner over the driving spindle nut, and revolve the oil pump a number of times to allow oil to circulate completely. The oil pump should now have freed off considerably. Slight stiffness remaining should decrease, if not disappear completely.

### SECTION C26

### TIMING COVER

There are two garter type seals in the timing cover, one at the contact breaker housing and one to seal the crankshaft to the cover.
Contact Breaker Seal- Failure of this seal is indicated by the presence of oil in the contact breaker housing. To remove the old scal it is necessary to prise out with a screwdriver or similar implement thus rendering the seal scrap. A new seal should be fitted, pressure side, that is spring side, towards the engine and the seal should be tapped fully home into the housing using Service Tool 063966.
Crankshaft Seal - This seal is retained in the housing with a circlip. After removing the circlip, the seal can be prised out of its housing but will be damaged beyond further use. Care must be taken to avoid damage to the housing. Fit the new seal pressure side towards the timing cover and drive fully home using Service Tool 063967. Refit the circlip "sharp'' side towards the crankcase and make sure that it is fully seated allround.
Where a new timing cover is being prepared for fitting, check that the blanking plug shown in Fig. C30 is in position. The timing cover odd screw lengths are shown in Fig. C31.

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