Norton Service Release Database N13

SERVICE RELEASE N13

NATURE OF RELEASE: Excessive Oil Consumption MODELS AFFECTED: Commando Models PARTS AFFECTED: Taper Compression Rings DISTRIBUTION: Worldwide EXPLANATION: We are aware of a condition of severe over-oiling and previously some improvement has been achieved by the change of scraper ring type and more careful assembly of the scraper rings. However, a certain number of machines have still returned unsatisfactory oil consumpion figures. As a result of intensive test rig and road tests, the problem has been pinpointed as a manufacturing discrepancy in the middle (taper faced) Piston Rings. After consultation with the ring manufacturers, a change in manufacturing techniques will prevent any reoccurrence on future rings to cope with any machines giving trouble in service, a revised form of piston ring is being made available immediately.   ACTION: On any machine returning an oil consumption figure heavier than 200 miles per pint, replace the middle ring on both pistons with the special ring 06-2262. It is essential to fit these rings correctly with the word "TOP" facing up wards so that proper oil control is gained. This special type of ring is identified by a chamfer on the inner diameter. We are-confident that after this rectification the over- oiling problem will be overcome. July 1970 Norton Villiers Canada Limited