Norton Service Release Database N3/43

SERVICE RELEASE N3/43

NATURE OF RELEASE: Auto-advance unit- periodic lubricaton MODELS AFFECTED: All Commando DISTRIBUTION: Worldwide (General Distribution) EXPLANATION: Following the investigation of auto-advance units returned for exchange under the terms of the recent 1972 Combat model programme - for the latest heat treated unit (Part Number 54425656), examination has revealed widespread lack of regular attention, particularly in respect of the cam/spindle bearing surface and the centrifugal weights and pivots.   ACTION: Owners and workshops should be made fully aware that regular and positive lubrication should be applied to the following bearing surfaces: 1. Cam and spindle 2. Centrifugal weight pivot pins 3. Centrifugal weight cam guide slots A smear of light Molybdenum based grease should be applied to the auto-advance cam bore and spindle, centrifugal weight pivot pins and cam guide slots at the 500 mile, (800 km) service and every 3, 000 miles (5, 000 Km) thereafter. Extreme care must be taken not to distort or stretch the advance unit control springs during the dis-assembly and re-assembly operation. It should be noted that our experience indicates the timing cover contact breaker compartment now remains substantially dry and free of lubricating oil mist subsequent to the introduction of the later (red identification) oil seal part number 063609 from engine number 212303 onwards. April 1973 Norton Villiers Canada Limited