Norton Service Release Database N3/51

SERVICE RELEASE N3/51

NATURE OF RELEASE: Cylinder Head Gasket & Gasket Sealant Compound MODELS AFFECTED: 750 Commando DISTRIBUTION: Worldwide (General Distribution) EXPLANATION: Service Release N3/21 introduced 3-750 model cylinder head gaskets: Subsequent service experience prompts the following additional recommendations:-   ACTION: 1. fit the "eyeletted" material cylinder head gasket Part Number 063844 whenever possible, and is perermissible on all machines previously using alloy or copper gaskets - provided Premium fuels (minimum 97 octane) are used. 2. Fit the copper gasket 064071 whenever a reduction in compression ratio is required. Always degrease cylinder, gasket and cylinder head faces prior to assembly. Apply Plastic Gasket ensuring both cylinder bores, oil drain holes and push rod tunnels are continuously circled with Loctite Plastic Gasket on the cylinder face, and after assembly of the copper gasket, similarly applied to the gasket top face. 3. Discontinue use of the alloy gasket. Where fuel availability is below 94 octane, the alloy gasket (or two copper gaskets) may be used provided:- a) Loctite Plastic Gasket compound is used as (2) above. b) Recommended cylinder head torque settings are increased to 35 ft. lbs. (gin. bolts) 25 ft. lbs. (5/16in. bolts etc. ) September 1973 Norton Villiers Canada Limited