It seems the closer I get to finishing my ’47 rebuild the more problems I encounter. Does anyone know why the gear box adjustment is virtually non existent. The gearbox holding bolts are close to the front of the slots and yet in trying to centralize them the gearbox fouls the rear frame boss. The maximum movement I have is about 1/4″ meaning I have to use a 1/2 link, and yet have most of the adjusting slot unusable. Question 2, With the Engine installed in the framed, mounting holes aligned nicely and bolts fitted, the cylinder head cannot be removed as it hits the front down tubes before clearing the studs. Does anyone have any ideas or are these unique problems to my machine?
I too have a ’47,Yes the gearbox does not have a lot of adjustment ,and as stated 1/2 links are used ,as for the cylinder head removal I don’t remember having any major problems, just let the cylinder base bolts go.
In conclusion the early post war machines is probably is a bit of a compromise .
I’m wondering if you have a Birmingham cylinder head on your engine, as they are a different shape to the Shipley version, with steeper sides and nothing like the amount of radius as a Shipley head. I could see this causing clearance problems…
Thanks for the input. Loosening the cylinder bolts and slightly tilting the cylinder back allows the head to be removed easily. I can see that the clearance between the left downtube and cylinder head is less than the right by a small amount, this is the interference side. The head hits the frame at the boss for the cylinder head stud so a change of head would not fix the problem. The Engine fits well, the mounting bolts do not have to be forced, so I think the frame is OK, I guess it’s just another idiosyncrasy of this model. Once again thanks for the help