1.f Norton SOHC Timing Case & Crankcase Parts

This is the multi-stepped crankcase bolt that is drilled through it centre to feed oil to the back of the crankcase wall, as well as providing a means to meter the feed of oil to the cambox

- This lipped nut is milled from solid round stainless bar and much improves appearance, particularly as the original are normally quite chewed. Not the cheapest of nuts due to the fact that it has to be machined from solid round bar. Update Dec 2010: New stock of these now in, CNC machined and beautiful to look at.

This is the adjuster screw that controls feed of oil to the barrel, through the rear cylinder bolt - Exactly as per original, but much prettier in stainless steel

This is the special reduced head nut, that acts as a lock nut for the adjuster screw A11/40 - Just as per original, but much prettier in stainless steel

This is the Copper washer that fits behind the cylinder feed bolt nut on all SOHC engines.  Price is each.

This is the crankshaft bevel gear,, fitted to SOHC International (i.e. aluminium crankcase models - not magnesium) and 1930 onwards CS1 engines. These gears faithfully replicate the original Norton tooth profile and pattern and we have them made for us by a top specialist UK gear manufacturer. Price is Each. Price is Each.  24/12/21: - New batch Just in - identical to previous batch

- This is the crankshaft bevel gear,, fitted to SOHC pre-Featherbed magnesium racing engines - i.e. M30/M40 and SOHC Manx type engines. These gears faithfully replicate the original Norton tooth profile and pattern and we have them made for us by a top specialist UK gear manufacturer. Price is Each.Price is Each.  24/12/21: - New batch Just in - identical to previous batch

- This is the lower vertical bevel gear, fitted to all SOHC International and Manx engines and also fitted to earlier DOHC Manx engines. These gears faithfully replicate the original Norton tooth profile and pattern and we have them made for us by a top specialist UK gear manufacturer. See detail listing for more information.  Price is Each.  24/12/21: - New batch Just in - identical to previous batch

- Driving plate for the oil pump on all SOHC engines, engaging with the oil pump drive gear on each ear, and from there driving the oil pump from the central slot.  Price is Each.

This is the oil pressure adjuster (and locknut)  that sits behind the inner timing case and controls the oil pressure to the entire lubricaton system on SOHC engines.   These are both CNC manufactured to the original Norton design in stainless steel.  Price is for one adjuster bolt and locknut.  See listing for fitting details 

- This spring retains the pressure release ball against its seat, in conjunction with the Pressure Release adjuster, controlling the engiine feed oil pressure on the SOHC engine.  These are made to the same conical pattern as the original spring.  Price is each.

These are the small bal bearings which were specific to the Norton SOHC Pressure Release Mechanism behind the timing case, it controls the pressure to the SOHC oil feed system, in conjunction with the pressure release adjuster and spring. One required per engine - put sold as a pack of 3, as very easy to lose or misplace them when stripping and cleaning this mechanism

These are the special 5/16" x 26tpi Half Nuts - as fitted to oil pressure adjuster bolt (which does not have the length to allow a full nut), these are in stainless steel. Pack of 3

Securing screw to fit SOHC oil pump - with reduced head.  Price is per pair

These SOHC Bevel Chamber Filter Bolts are CNC manufactured by us to the original Norton design - but we make them in high quality stainless steel, with the correct imperial thread and hex.  They fit into the SOHC bevel chest from the front (from approximately 1932 onwards) and are an essential part of the oil system - collecting oil that has collected in the bottom of the bevel chamber - but not allowing any swarf through. Price Is Each

These SOHC Bevel Chamber Filter Bolts are CNC manufactured by us to the original Norton design - but we make them in high quality stainless steel, with the correct imperial thread and hex.  They fit into the SOHC bevel chest (from approximately 1932 onwards) and are an essential part of the oil system - collecting oil that has collected in the bottom of the bevel chamber - but not allowing any swarf through.  This particular type also has a 'reduced' head - which looks particularly nice on a competition or sports machine. Price is Each

- Modern equivelant Dowty washer (outer washer is zinc plated steel, inner washer is neoprene). This washer is used behind the timing chamber filter bolt and also at the back of the rear cylinder crankcase mouth bolt (that has an oil feed)

- High quality traditional paper gasket for all SOHC Norton timing chests

- Large right hand thread driveside nut, secures engine sprocket on taper - Fits all SOHC engines and early DOHC engines.  CNC Machined.  Price is Each.

These are the unions that screw into the crankcase behind the timing chamber - it is the smaller 1/4" BSP side that screws into the crankcase, the larger side is 3/8" BSP and takes the distinctive large oil pipes fitted to Norton Internationals. 

This is the Union that fits into International and SOHC Manx crankcases for both Feed and Return. It allows for the standard 3/8" BSP SOHC Norton oil pipes to be connected. It is very close to original but is a modern item, and uses a larger spanner hex, requiring a UNF spanner. This is a cheaper alternative to the original brass union that I have made specially (Item no 0246), but as you only need to screw it in once this is not really an issue - item is still high quality and is cadmium plated. - Price is per each

High quality Red Fibre Washer that seals the oil pipe unions on Inter/Manx crankcases. Also fits behind the A11\878 rear cylinder feed shouldered nut. Price is per pair

Correct (and as per original) 1/4" BSP 'One Way Valve' - as fitted to all Norton singles, including all SOHC, OHV and SV models - this item screwing into the recess just above the drive side main bearings, allowing the engine to breathe correctly. July 2023: Now back in Stock 

This is a faithful reproduction of the straight through union fitted to SOHC (and DOHC) cambox's for connecting the cambox oil feed pipe (fitted at top of crankcase and cambox), but also used as a front crankcase breather on many Inters and magnesium racing engines.  Finally it is also fitted as a breather union on the bevel chamber of magnesium racing crankcases behind the inner timing cover (while Inter crankcases instead employ a pressure telltale unit).  Copied from an original pre-war item

This is modern replacement for the straight thru breather used on Norton crankcases and timing cases - but uses AF Hex (not Whitworth) - if you are not worried about originality!

These Red Fibre Washers are a smaller diameter than 'normal' 1/4" BSP washers - but then pre-threaded by us - so they are a good fit on those Norton fittings that used 1/4" BSP thread, but have a groove behind the thread - e.g. Norton pre-48 Oil Sump Plugs and some breather union fittings.  See detail listing for more information.  This listing is for a bag of 5 washers

These Red Fibre Washers are a smaller diameter than 'normal' 1/4" BSP washers - but then pre-threaded by us - so they are a good fit on those Norton fittings that used 1/4" BSP thread, but have a groove behind the thread - e.g. Norton pre-48 Oil Sump Plugs and some breather union fittings.  See detail listing for more information.  This listing is for a pair washers

These Red Fibre Washers are a nice close fit on 1/4" BSP threads and are useful for many Norton fittings - such as those breather unions and petrol taps that have a 1/4" BSP thread that comes up close to the hex or shoulder. Unlike many BSP fibre washers available these days - these ones are a good fit to the thread.  See listing for more information. Price is per pair