Norton Service Release Database N42

SERVICE RELEASE N42

NATURE OF RELEASE: Timing Cover replacement MODELS AFFECTED: Early Commando with chain driven contact breaker DISTRIBUTION: Worldwide (for general distribution) EXPLANATION: It has been brought to our notice that severe engine damage has been caused on more than one occasion by the use of Atlas timing cover 25187 as a replacement for the Commando timing cover 06-0716. The reason is that the bleed back from the oil pressure release valve into the oil feed differs between Atlas and Commando . Use of the Atlas cover on a Commando crankcase. uncovers the release valve oilway, resulting in a severe loss of oil pressure.   ACTION: Ensure that whenever a timing cover is replaced, only the correct replacement is used. Febuary 1971 Norton Villiers Canada Limited