1.d Norton SOHC Cambox

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

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 pack of 4 washers

- Good quality Copper washer suitable for 1/4" BSP fittings on most Norton SOHC/OHV/SV engines - i.e. One Way Valves, Breather Unions and Crankcase Oil unions. They can also be fitted to 1/4 BSP petrol taps if required - see listing for details. Sold as a pack of 3

These are the brass union assemblies that screw into the front bevel gear chamber of the SOHC cambox and feed oil to the valve guides, via the small bore copper pipes. Similarly, they were also fitted to many pre-1938 OHV rockerbox's. This assembly is for an inlet valve assembly - as the union has a smaller oil feed hole than the exhaust assembly.  Supplied as complete assembly, where pipe can be modelled to fit your engine.  See detail listing for more information.  Price is per assembly.

These are the brass union assemblies that screw into the front bevel gear chamber of the SOHC cambox and feed oil to the valve guides, via the small bore copper pipes. Similarly, they were also fitted to many pre-1938 OHV rockerbox's. This assembly is for an Exhaust valve assembly - as the union has a larger oil feed hole than the inlet guide assembly.  Supplied as complete assembly, where pipe can be modelled to fit your engine.  See detail listing for more information.  Price is per assembly.

This is the correct type 'volute' spring of the type originally used Norton Internationals (and also OHV and SV Nortons) to hold the exhaust valve lifter cable in tension correctly. These are identical in shape and length to original springs.  See detail listing for fitting instructions.  Price is each. 

This is the eccentric pin that fits in the bearing boss at the front of those cambox's that are fitted with provision for an exhaust lifter mechanism (see the accompanying photograph for how the pin fits in this boss). 

This is the shouldered SOHC Cambox - Exhaust Valve Lifter Bearing that holds the eccentric exhaust valve lifter spindle - made in phospher bronze

This is a faithful reproduction of the SOHC exhaust valve lifter arn and the special 'reduced head' bolt that is fitted with it.  Both are copied exactly from oriignal patterns but both manufactured in stainless steel.  Price is for the arm and bolt as a pair

This listing is for a complete SOHC Exhaust valve lifter set consisting of: Eccentric valve lifter spindle, Valve lifter arm and bolt, and the volute spring. 

This is the distinctive bolt that was fitted to both Norton gearbox clutch pull arms and exhaust lifter arms - which has a reduced hex head and convex base - often gets chewed on original arms.  CNC manufactured in stainless steel.  Price is Each

This brass cable adjuster, with locknut is of the type commonly used on the end of Norton single cylinder exhaust valve lifter cable assemblies.  See the detail listing and photos for how they would commonly be used, dependent on if SOHC, OHV or SV models.  These can also be used on some other cable assemblies if requiring a 1/4" BSC thread cable adjuster.  Price is per Adjuster + Locknut

This listing is for a generic/universal type exhaust Lifter Cable and spring/adjuster/clip at the end.  PLEASE NNOTE:  This cable WILL NOT fit most Norton SOHC/OHV/SV models without alteration - so do not purchase unless you are able to adapt the cable yourself.  This cable is intended as a starting point, if you are confident to make cables up yourself.  See Listing Detail for more information.  Price is Each.

This item is a short type Exhaust Valve Lifter lever - to fit 1" diameter handlebars.  1" handlebars were fitted to many Norton's and other marques pre-WW2 - but finding ancillary control parts for that diameter of handlebar can be difficult, particularly exhaust valve levers.  See detail lisitng for more information.  Price is Each

This item is a long type Exhaust Valve Lifter lever - to fit 1" diameter handlebars.  1" handlebars were fitted to many Norton's and other marques pre-WW2 - but finding ancillary control parts for that diameter of handlebar can be difficult, particularly exhaust valve levers.  See detail lisitng for more information.  Price is Each

Complete Cambox Feed pipe and 1/4" BSP union nut's to fit all SOHC models (30/40, M30/M40 etc), with lockwired oil resistent pipe middle piece - so pipe length can be adjusted to suit the height length of your crankcase/barrel/head/cambox combination.  Comes as complete assembly, with spare lockwire length

Crankcase feed pipe to from SOHC crankcase to cambox and 1/4" BSP union nut's to fit all SOHC models (30/40, M30/M40 etc) - this is the bottom piece of the cambox feed pipe assembly - which we offer here to be purchased seperately.  Bent as per original (to avoid fouling barrel) in satin plated copper pipe.  Also - a suitable replacement for OHV/SV oil tank breather pipe - Part no: A2/198, see listing.  Price is per pipe and BSP nut.

Lockwire:  12"/(approx) 300mm length of Goodrich stainless steel lockwire, for lockwiring breather pipes

Black (original rubber style) 5/16" oil reistent pipe for cambox feedpipe assembly - 4.5"/110mm length

Black (original rubber style) 5/16" oil reistent pipe for use for oil breather pipes, oil pipes (or even big bore fuel pipes if required - although 1/4" bore pipe is more normally used) - 3 foot /900mm length - This type is ethanol proof and all writing removed

Black (original rubber style) 5/16" oil reistent pipe for use for oil breather pipes, oil pipes (or even big bore fuel pipes if required - although 1/4" bore pipe is more normally used) - 3 foot /900mm length

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!

Crankcase drive side breather pipe that fits on one way valve on SOHC/OHV/SV road going International models with Norton oilbath chaincease fitted, includes lockwire for fitting black oil pipe, (if required). Back in Stock May 2025  

Norton International oil tank top breather pipe.  This pipe was original fitment on the top of half wrapround International oil tanks, feeding the breather pipe over the frame saddle tube. Includes lockwire for fitting black oil pipe (if required).

This Felt seal making kit consists of a variety of the thickness of 100% Black Wool Felt offered in the other listings + a white (PAINT) marker pen which is ideal for the purpose of marking out the washer/seal to be made before cutting.  See detail listing for kit contents

1mm thick, 100% Wool Black Felt sheet - Med 400mm x 245mm size.  This is 1mm (thin) pure wool felt material - very useful for wrapping around cambox area, lower primary chain rungs or undercovering under saddles and seats.  It can also be used for thin felt washers.  Price per sheet 

2mm thick, 100% Wool Black Felt sheet - 300mm x 250mm size.  This is 2mm (medium thickness) pure wool felt material - very useful for slim felt washers, or absorbent material for wrapping around cambox area, lower primary chain rungs or undercovering under seats and saddles.  Price per sheet