Norton Commando Workshop Manual

## Engine/Primary Transmission

# C

### SECTION C15

### REMOVING CRANKCASE ASSEMBLY FROM FRAME

Removal of the crankcase assembly from the frame is most easily achieved by removing the remaining ancillary equipment then taking out the front mounting complete and draining all remaining oil from the crankcase.
The full routine is as follows:
1 | Disconnect the tachometer cable at the front of crankcase.
2 | Remove the rocker feed pipe from the back of the crankcases and collect the copper washers.
3 | Remove the gear indicator and set screw. Remove also the gear pedal which is secured by one bolt.
4 | Push the crankcase breather pipe clear of the oil tank.
5 | Place a large capacity drain tray beneath the crankcases.
6 | Remove the oil pipe junction block from the rear of the crankcase.
7 | Slacken the large hexagon sump filter on the bottom of the crankcases. The filter may be expected to be extremely tight and a good fitting spanner with reasonable leverage will be necessary. The spanner size is 7/8 in. Whitworth. This plug is not used after engine number 200000. Service Tool No. NM 12093 is for this hexagon.
8 | Remove the large diameter centre bolt of the front mounting from the timing side. This will necessitate aligning the flats on the bolt head to clear the timing case. To facilitate removal of the front mountings from between the frame down tube brackets, slide back the gaiter at the left hand side so that the spacer, end cap and shims can be withdrawn. Remove the two nuts from the timing side of the engine mounting studs, then pull out the studs complete with remaining nuts from the drive side. The front mounting can then be pulled free away from the crankcases.
9 | Remove the bottom rear crankcase-to-engine-plate bolt and the bottom centre stud. Extract the bottom stud by lifting the crankcase assembly slightly so that the stud clears the frame rails.

10 | The sump filter (only fitted up to engine number 200000) can now be removed completely and the engine lifted vertically to enable the crankcase to be drained. Fig. C17 shows the crankcases supported by a bar from below whilst the sump filter is removed with the fingers after slackening at an earlier stage.
11 | Remove the top rear engine to engine plate nut, supporting the weight of the crankcase as the stud is pulled out.
12 | The crankcase assembly is now free to be removed from the mounting plates as shown in Fig. C18. Further dismantling of the engine can proceed more conveniently on the bench atter removal.

<< | < | rocbo.net | >