1.e Norton SOHC Crankshaft Parts

- 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. - available in the following 5 sizes :0.002"

/0.004" /0.008"/0.016"

/0.023". - Note: if buying individual shims, please state size when you place the online order, thanks. Update Feb 2015: Now back in stock again

- 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 complete set of 5 shims in the following sizes :0.002"

/0.004" /0.008"/0.016"

/0.023". (with a cost saving over buying them separately). Update Feb 2015: Now back in stock again

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. The plate was secured by 3 screws (sold seperately), which were soldered to the plate after tightening, to ensure they do not come lose. This plate is copied from an original item. Note: this plate fits all International crankcases after approximately 1932. before that time a shallower plate was used. If you are not sure - measure the lip of the main bearing housing ( see second photo), if it sits approx. 0.225" above the crankcase wall it is for this plate. If it measures approximately 0.175" above crankcase - then the very early securing plate is required (see Item no 0287). The late type crankcase is on the left in the 3rd photo

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. The plate was secured by 4 screws (sold seperately), which were soldered to the plate after tightening, to ensure they do not come lose. This plate is copied from an original item

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 all SOHC International and CS1 engines. These gears have been faithfully reproduced using original Norton gears as the pattern and are identical in all dimensions, including the tooth profile, so they can be used in conjunction with original lower vertical bevel gears if you already have one of these. They are manufactured for me by a specialist helical gear manufacturer in the UK and are very high quality. Photograph 1 shows the gear from front and rear. Photograph 2 shows an original Norton gear at the top of the photograph and our gears underneath. Photograph 3 shows the International bevel gear on the left, with the shallower SOHC Manx gear on the right. The International gear was fitted to all Aluminium crankcase engines. The gear has PVN branding etched on the rear. Note: 17/11 - we will shortly be offering Oldham couplings and upper bevel gears as well

This is the crankshaft bevel gear, fitted to SOHC (and early DOHC) Manx engines. It is identical to the International gear, other than the shoulder at the rear of the gear is narrower, as the Manx timing side crankcase is fitted with a wider double row bearing. These gears have been faithfully reproduced using original Norton gears as the pattern and are identical in all dimensions, including the tooth profile, so they can be used in conjunction with original lower vertical bevel gears if you already have one of these. They are manufactured for me by a specialist helical gear manufacturer in the UK and are very high quality. Photograph 1 shows the gear from front and rear. Photograph 2 shows an original Norton gear at the top of the photograph and our gears underneath. Photograph 3 shows the International bevel gear on the left, with the shallower SOHC Manx gear on the right. The Manx gear is fitted to magnesium crankcase engines. The gear has PVN branding etched on the rear. Note: 17/11 - we will shortly be offering Oldham couplings and upper bevel gears as well

This item is for the pair of lower SOHC bevel gears - Item 0421 and either item 0422 (International Crankshaft Bevel Gear) or item 0423 (Manx Crankshaft Bevel Gear). See the individual items for the description of each. Please state if you require International or Manx crankshaft gear when you place the order. These gears are fractionally cheaper when bought as a 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

- 1/4" BSP Copper Washer - pack of 3. This washer is suitable for use in 3 places - the Drive Side One Way Valve and the straight through breather or unions fitted to SOHC crankcase fittings and cambox. These washers are not quite as wide as item 0090b, and therefore look less obtrusive when fitted behind these unions (you may decide though you prefer to fit red fibre washers which we also sell). These can also be fitted to 1/4 BSP petrol taps. 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 - but are a very tight fit on the thread. To fit them I place the breather (or similar 1/4" BSP fitting) in soft jaw vice, then place these washers just onto the thread - then I carefully use a pair of large pliers (the circular hole with coarse teeth) to carefully wind them onto the thread. Although this is difficult - the result is the correct size washer that does not look out of place under a Norton breather (unlike many modern ones that are far too wide and look out of place). These are high quality washers from a top manufacturer - sold in pack of 5. Note: do not buy if you are worried you might not be able to fit them!!

1/4" BSP Copper Washer - pack of 3. This washer is suitable for use in 3 places - the main Oil pipe unions that screw into the crankcase (see second photograph), the Oil filter bolt that fits at the base of the timing case chamber or the sump plug screw. 

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

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

7/16" Stainless Steel Engine Bolt Washers, but with Reduced Outer Diameter, which are correct for Norton 7/16" engine bolts as used on SOHC engines: Price is for bag of 4. Please read detail description 

1/2" Stainless Steel Engine Bolt Washers, but with Reduced Outer Diameter, which are correct for the front Norton 1/2" engine/frame bolt as used on SOHC engines (as well as other 1/2" bolts where you do not want to fit a standard wide type washer : Price is for bag of 6

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