Norton Commando Workshop Manual

## Frame and Ancillaries

# F

### SECTION F12

### SHIMMING ENGINE MOUNTINGS

Prior to checking shimming note that whilst pre 1971 models can be supported on the centre stand during this operation,1971 and later models must be supported by a stand or strong box placed below the main frame tubes with the centre stand folded. This is necessary due to the stand being mounted direct onto the engine plates on later models. On such models the mountings would be under tension with the centre stand in use. Proceed as follows:

### SECTION F13

### CHECKING FRONT SHIMMING

1 | Slide the left side gaiter back to give access to the shims and polyurethane washer.
2 | Insert feeler gauges as required between the shims and polyurethane washer (see Fig. F12). The ideal clearance is 0.010 in. (0.025 mm). Make a note of the actual clearance.

### SECTION F14

### CHECKING REAR SHIMMING

1 | Slide the right side gaiter back to give access to the shims and polyurethane washer.
2 | Insert feeler gauges as required between the shims and polyurethane washer (see Fig F12). The ideal clearance is 0.010 in. (0.025 mm). Make a note of the actual clearance.

### SECTION 15

### ADJUSTING FRONT SHIMMING

There are two methods of adjusting front shimming, the quicker method (Method 1) deals with the mounting in situ and is intended for checking as an item of routine maintenance. Method 2 deals with removal of the complete front mounting without removing the power unit. This method is preferred where the mounting has seen a great deal of service and requires a thorough cleaning and the replacement of worn components.

### METHOD 1

1 | Remove the self locking nut and plain washer from the mounting bolt.
2 | Align the flats on the hexagon of the mounting bolt with the timing case casting of the engine.
3 | Using a soft metal drift to avoid damaging the threads drive the bolt through sufficiently that the gaiter, spacer and polyurethane washer can be removed together.
4 | Remove the end cap and note the shim thicknesses.
Shims are available in 0.005 in., 0.010 in., 0.020 in. and 0.030 in. thickness. If at the time of stripping, the clearance was found to be, for example, 0.030 in., then a shim of 0.020 in. thickness should be added. It is obviously more desirable to use one 0.020 in. shim than a collection of shims to this thickness which tend to deteriorate faster. Prior to reassembly, clean all the parts including inside the gaiters, and grease lightly. Examine the polyurethane washer for excessive wear producing uneven thickness and replace if necessary. Proceed as follows:
5 | Reassemble the gaiter, spacing collar and shims after attention, in the order shown in Fig. F14. Note that the reassembly procedure is a reversal of that used in dismantling but take care to fit the cap with shims well over the actual mounting to allow room for the gaiter, spacing washer and polyurethane washer to be fitted together.
6 | Secure the mounting bolt to a torque reading of 25 Ib./ft. (3.456 Kg/m).

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