1.e Norton SOHC Crankshaft Parts

- Essential when rebuilding your engine to ensure that the conrod sits central in the crankcase and that the roller bearing inner cage on the drive side does not have excess play on the crankshaft. This is for a complete set of 5 shims in the following sizes : 

0.5mm/0.3mm/ 0.2mm/0.1mm/0.05mm.  See listing for more detail on thicknesses.

 

- Essential when rebuilding your engine to ensure that the mainshaft bevel has the correct backlash and position in relation to the lower vertical bevel gear, these mainshaft shims fit between the timing side main bearing and the mainshaft bevel gear - This shim is used once the crankshaft has been shimmed and you are fitting the lower bevel gears. This is for a single shim in one of the following sizes: 

0.5mm/0.3mm/ 0.2mm/0.1mm/0.05mm.  See listing for more detail on thicknesses.

- Essential when rebuilding your engine to ensure that the mainshaft bevel has the correct backlash and position in relation to the lower vertical bevel gear, these mainshaft shims fit between the timing side main bearing and the mainshaft bevel gear. This is for a complete set of 5 shims in the following sizes : 

0.5mm/0.3mm/ 0.2mm/0.1mm/0.05mm.  See listing for more detail on thicknesses.

3 screw mainshaft bearing securing plate, to fit all Model 30 and Model 40 International (and CS1/CJ) engines. This pressed steel plate was used to retain the main bearings and ensure they did not 'walk' under heavy use. 

4 screw mainshaft bearing securing plate, to fit all Model 30M and Model 40M magnesium engines. This pressed steel plate was used to retain the main bearings and ensure they did not 'walk' under heavy use. 

This is the shallower type of Model 30/40 main bearing plate that was fitted to very early Cammy engines - I believe prior to 1933 (although I cannot be exactly sure when the lip was made larger). I confess - it was only a year or so ago that I realised earlier bearing covers were different to the more common type (Item 0285). . . but a customer told me his original was different to the later type I had sent him. If you have an early engine and are not sure which type you need, then measure how far the bearing lip stands proud of the inner crankcase wall (as In photo 2) - if it sits approx. 0.225" above the crankcase wall then you need the later type (Item no 0285). If it measures approximately 0.175" above crankcase then you have the early type crankcase and you need this bearing cover. The early type crankcase is on the right on the 3rd photograph. (sorry this one more expensive - but have had to pay for tooling for a much smaller batch)

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

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

- 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. Sold as a pack of 3

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

This is the fibre washer that fits behind the oil feed/return crankcase union. Also fits behind the A11\878 rear cylinder feed shouldered nut

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!

Surprisingly it is very difficult to find good quality vulcanised (red fibre) washers to fit 1/4"BSP fittings. These red fibre washers are of the highest quality (from a specialist manufacturer) and have just the right external diameter - see listing for details

Distinctive small hex blanking plug/bolt that locates on the left side on the crankcase lower bevel platfom.  CNC maufactured in stainless steel and includes red fibre washer 

- 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)

Breather Pipe (listed in Norton 1948 catalog as Pressure Release Pipe) and 1/4" BSP union nut to fit bevel chamber of all SOHC models (30/40, M30/M40 etc)

Breather Pipe (listed in Norton 1948 catalog as Pressure Release Pipe) and 1/4" BSP union nut to fit bevel chamber of all SOHC models (30/40, M30/M40 etc)

Breather pipe to fit breather union of type fitted to the front of drive side crankcase - most commonly fitted to magnesium M30 (and early pre-Featherbed Manx) crankcases 

Crankcase feed pipe 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

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

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 the E3224 3/8" x 26 tpi BSC engine nut as fitted to many Norton engine bolts.  It has the correct 'reduced head' and greater depth than other commercially available nuts of this thread/size - and is CNC made specially by us for fitting to Norton engine bolts, but in stainless steel 

This is the special 13294 front engine plate top bolt that is fitted to M30/M40 (pre-Featherbed Manx) magnesium engines.  It has the correct 'reduced' head 0.600" AF hex head, with distinctive Norton curved head finish.  This set comes complete with correct matching E3224 nut and two washers, all in stainless steel. It is 3/8" shaft diameter  

This is the E3238 7/16" x 20 tpi engine nut as fitted to many Norton engine bolts.  It has the correct 'reduced head' and greater depth than other commercially available nuts of this thread/size - and is CNC made specially by us for fitting to Norton engine bolts, but in stainless steel