Norton Service Release Database N55

SERVICE RELEASE N55

NATURE OF RELEASE: Inlet Valve Guide Oil Seals MODELS AFFECTED: Commando- all years and models PARTS AFFECTED: Inlet valve guide seal 062726 DISTRIBUTION: Worldwide (Trade Only) EXPLANATION: Service Release N45 detailed the introduction and fitting of new inlet valve guides with seals. WC have subsequently encountered instances of the seals being fitted incorrectly. It is most important for the lip of the seal to locate all round in the groove of the inlet valve guide. The illustration below shows the seal fitted correctly. If the lip is not located the seal will ride up and down with the valve stem rather than providing a wiping action to prevent oil passing between the valve and guide.   Norton Villier Canada Limited