Norton Service Release Database N26

SERVICE RELEASE N26

NATURE OF RELEASE: Clutch slip MODELS AFFECTED: All Commando DISTRIBUTION: Worldwide (For general distribution) EXPLANATION: It is apparent that primary chaincases are being overfilled by some owners, giving rise to clutch slip. The oil level should always be checked by using the level plug located on the front surface of the primary chaincase in line below the chaincase fixing bolt. With the level plug removed add the recommended grade of oil through the filler hole until it starts to trickle from the level hole. When this stage is reached, allow any surplus oil to drain and then refit the level plug and filler plug. The level is now correct. Clutch slip can be caused by incorrect free play on the clutch push rod or lack of free play on the clutch cable. To adjust, slacken off as far as possible the cable adjuster at the handlebars control. Remove the large slotted plug on the primary chaincase to gain access to the diaphragm spring centre adjuster locknut. Slacken the locknut and then, using a screwdriver, screw the slotted adjuster gently home until contact with the clutch push rod can be felt. At this stage unscrew the adjuster one quarter turn. Now, holding the adjuster with a screwdriver to prevent movement, tighten the locknut fully. Clutch push rod adjustment is now correct and the plug in the chaincase can be replaced. Ensure that the cable and lever pivots are lubricated and that there are no tight bends in the cable. The final operation is to adjust the cable free play at the handlebar lever to l/16" to 1/8". If these steps have been taken and slip continues, providing the friction plates are not worn severely or charred, the small clutch drive pins between the steel back plate and housing may have sheared. This in effect causes the clutch to function less one friction plate. Special hardened steel pins are used which must only be replaced by genuine Norton spares, part number 06-0756.   December 1970 Norton Villiers Canada Limited