Norton Commando Workshop Manual

## Frame and Ancillaries

# F

9 | Using a soft metal drift, tap the main mounting stud right through from the left side and have the assistance of a second operator to align the frame lug with the mounting bolt, levering if necessary between the engine plate and frame tube to aid alignment, and inserting the spacer between the alloy footrest mounting plate and frame bracket.
10 | Fit the plain washer and self-locking nut and tighten to a torque of 25 Ibs./ft.
After considerable useage it may be expected that the mounting end groups have suffered wear and deterioration due to corrosion and after dismantling of the primary transmission and removal of the mounting stud the left end group can be removed for cleaning, greasing and replacement of the worn parts. If the rubbers and buffers are to receive attention as in Section F17 the power unit must be removed from the frame as described in Section F1. However, the need for attention to these particular is comparatively rare.

### SECTION F17

### RENEWAL OF RUBBERS AND BUFFERS

This section assumes that the end cap groups have already been removed and that, in the case of the rear mounting, the power unit complete has been removed to gain access.
Renewing Isolastic Mounting Rubbers
Pre 1970 models not covered by this manual used mounting bushes with outer steel sleeves which often proved extremely difficult to remove. 1970 and later models use bonded mounting bushes which are lubricated at the time of assembly and which present no such problems. Removal does not necessitate the use of special tools though reassembly requires the use of special tool 063971. Proceed to remove as below but refer to Fig. F14 for the positions ot bushes and buffers.
Front mounting
1 | Place a suitable sized bar into the steel centre of either bonded bush only sufficiently to occupy the bush sleeve. Apply strong side pressure on the bar and the bush will turn in the mounting tube and can be prised out.
2 | Lift out the spacer tube complete with two rubber buffers.
3 | Repeat the operation of removal by side pressure applied by a bar through the remaining bush. Examine all parts for deterioration and renew parts as necessary before reassembly.
4 | Fit the tapered guide body 063971 over the end of the mounting tube as shown in Fig. F15
5 | Take the first bush and paint the edge with a rubber lubricant.
6 | Press the bush either way round into the tapered guide to compress the rubber to the diameter of the mounting tube.

7 | Using service tool 063971 as in Fig. F15, either press or drive with a hammer so that the bush slides home into the mounting tube and the shoulder of this tool abuts to the top of the tapered guide. The first bush is now in the correct position.
8 | Now invert the mounting and slide the two buffer rubbers over the spacer tube until they are central, with a gap of 1/2 inch (12.70 mm) betwean the buffers.
9 | Place the spacer tube complete with buffers in the mounting tube, resting on the first bush fitted.
10 | Repeat operations 4, 5, 6, 7, for the second bush. The front mounting is now complete with rubbers and ready for reassembly.
Rear mounting
1 | Place a suitable sized bar into the steel centre of either bonded bush only sufficiently to occupy the bush sleeve. Apply strong side pressure on the bar and the bush will turn and can be prised out.
2 | Lift out the first short spacer tube complete with buffer.
3 | Remove the centre bush. Since this is recessed far into the mounting tube, access by a bar as for the end bushes will be more difficult. An alternative is to use the bar as a drift, then strike one side of the bush on the rubber portion and the bush will turn sideways in the tube. The bush may then be pulled easily from the mounting tube.
4 | Collect the second spacer complete with buffer.
5 | Repeat the operation of removal by side pressure applied by a bar through the remaining bush. Examine all parts for deterioration and renew as necessary before reassembly.
6 | Paint the edge of the centre bush with rubber lubricant (all the rear mounting bushes are identical but of smaller outside diameter than the front mounting bushes).
7 | By hand pressure only and without the need for a tapered guide, push the centre bush into the end of the mounting tube. Then using a suitable length of large diameter tubing push the bush into the centre of the tube 3 1/4 inches (75.15 mm) from each end of the tube.
8 | Place one spacer tube, with buffer rubber centrally positioned, against the centre bush.
9 | On the same side of the mounting, lubricate and press in the second bush until it abuts to the spacer tube.
10 | Invert the mounting tube and repeat operations 8 and 9 for the second side of the mounting. The rear mounting is now complete with rubbers and ready for reassembly.
Fig. F15. Front mounting assembly tools. "A" shows bush in tapered guide. "B" shows bush entered in mounting tube.

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