Norton Service Release Database N3/31

SERVICE RELEASE N3/31

NATURE OF RELEASE: Removing autoadvance mechanism MODELS AFFECTED: All Commando with timing cover contact breaker DISTRIBUTION: Worldwide (General Distribution) EXPLANATION: Due to possible manufacturing variations, removal of the auto-advance mechanism utilising a straight pull with the extended centre bolt tool 060934 can result in the mechanism subsequently jamming. We therefore recommend future removal, partly by end pressure and partly by tapping sideways to "break" the tapered joint between the auto-advance shaft and camshaft.   ACTION: Remove the centre bolt and washer from the auto-advance mechanism. Insert auto-advance extractor bolt 060934 and partial tighten only. Tap sideways very lightly on the extractor bolt and the tapered joint will be parted without risk of spreading the auto-advance unit shaft at the cam bea'ring. (Warning: The auto-advance unit tapered section of the camshaft is manufactured in a fully annealed condition, and will be damaged if excessive side shock loading is applied). January 1973 Norton Villers Canada Limited