Will, I looked again at the diagram you suggested and the measurement of the main-shaft from the oil seal to the drive sprocket end. I measured this as 3 and 3/8 inches or 3.375. The diagram indicates a length of 3.40 so I believe I have the longer shaft for the FERC which is correct for the '56 set...

Will,
Thank you yes I have seen the diagram but I can't take a measurement for 'C' until I remove the sprocket retainer. I will do that at some point to replace the mainshaft oil seal.
Dennis

Roger, Thank you for that information. I should have credited you with suggesting buying an inner case rather than repairing mine. By chance there was one on eBay that I have purchased. As for the mainshaft, I have the dimensions from a post on this forum but it is difficult to measure the shaft in ...

Paul, Many thanks for your reply. I note your comments about sourcing a replacement inner case and the mainshaft length. Strangely, the gearbox was mated to the engine with the engine plates when I bought it suggesting that the engine and gearbox were used together. But, the engine number confirms i...

Took my '56 NH350 gearbox apart today to find a large crack in the kickstart shaft support in the inner casing. The gearbox is a new acquisition so I do not know its history. Is the crack repairable and should there be a bush inside the hole for the kickstart shaft to pivot on? If there should be a ...

By a happy coincidence a member near me was selling a +30 used piston and a new old stock piston ring set on eBay and I was the lucky winner of the auction.
Rings fitted to my piston and the barrel fitted. The piston I bought is a useful spare.
Dennis

Dave,
Thank you for that information. I may have found a supplier but if that falls through I will contact Cox and Turner.
Dennis

I broke a piston ring re-fitting the barrel on my 1956 NH350 today. I see that Drags sell piston ring sets but they stock standard/ 20/40 and 60 oversize. My piston has +30 clearly stamped on the crown. Do I need to find +30 rings if they exist?
Many thanks, Dennis

Simon, thanks I'll take a look.
Dennis

Roger,
Many thanks for looking. I assume that you or someone at the club entered my name against the frame number when i posted a topic asking what year the frame was made so we come full circle
Dennis