Norton Service Release Database N77

SERVICE RELEASE N77

NATURE OF RELEASE: 1972 Camshafts and bushes MODELS AFFECTED: All Commando DISTRIBUTION: Worldwide (For general distribution) EXPLANATION: New type camshaft bushes with oil groove are introduced for 1972. To suit these, camshafts are being produced without the figure of eight oil groove which was a feature of previous camshafts. Whilst we shall continue to stock the bushes and camshafts of the previous type for spares purposes, all concerned are alerted to the danger of using a 1972 non-grooved camshaft in pre-1972 non-grooved bushes, which would result in oil starvation and possible engine damage. 1972 camshaft bushes are of smaller outside diameter than previous camshaft bushes and as a result, it is not possible to fit later bushes to an earlier crankcase. No harm would result from using a grooved camshaft in a grooved bush if this should prove necessary at anytime   ACTION: Ensure that the correct years parts are ordered when replacement camshafts or camshaft bushes are required and on fitting recheck that either the camshaft journals or bushes have lubrication grooves. February 1972 Norton Villier Canada Limited