Norton Service Release Database N3/14

SERVICE RELEASE N3/14

NATURE OF RELEASE: Revision to Service Release N3/10 (Isolastic Shimming) MODELS AFFECTED: Commando (all models) DISTRIBUTION: Worldwide (general distribution) EXPLANATION: Due to a typographical error reference is made in Service Release N3/10 sheet 2 to the addition of a 0.002in. shim in the rear mounting. This should of course read 0.020in. A new sheet 2 for this release, showing the correct figure, is enclosed.   ACTION: Substitute the new sheet 2 in your copy of the release and destroy the original. Shimming front mounting - Remove the self-locking nut and plain washer from the mounting bolt. Align the flats on the hexagon of the mounting bolt with the timing case casting of the engine. Using a soft metal drift to avoid damaging the threads drive the bolt through sufficiently that the gaiter, collar and polyurethane washer can be removed together. Remove the tube end cap. If at the time of checking, the clearance was found to be, for example, 0.030in. , then a shim, of 0.020in. thickness should be added to fit between the end cap counterbore and the end of the engine mounting tube. Prior to reassembly, clean all the parts including inside the gaiters, and grease. lightly using silicone grease RELEASIL No.7. Examine the polyurethane washer for excessive wear producing uneven thickness and replace if necessary. Reassemble the gaiter, mounting collar and polyurethane washer after attention. Note that the reassembly procedure is a reversal of that used in dismantling but take care to fit the end cap with shims snugly over the actual mounting to allow room for the gaiter, spacing washer and polyurethane washer to be fitted together. Secure the mounting bolt and nut to a torque reading of 25lb/ft. Shimming rear mounting - Remove the self-locking nut and washer from the right end of the main mounting stud. Using a soft metal drift drive the mounting stud partially through, right to left until it protrudes some 4in. from the left hand side. Slide the right gaiter lip off the mounting tube then push down and rearwards clear of the frame the gaiter, mounting collar and polyurethane washer as a group. Collect the right side tube cap complete with shims. As with the front mounting, the thickness of shims required should be determined from the measurement at the time of checking against the designed clearance. For example, to correct a clearance of 0.030in. , a single 0.002in. shim would n June 1972 Norton Villier Canada Limited