Why is it, I wonder, that on my bike (1965 B40F) there is a gasket for the primary chaincase cover, but not for the timing side outer cover (which also holds oil - gear oil in rear part)? Phil
Hi Phil,
My guess would be a gasket on the gearbox side would mess up the designers main and layshaft end float tolerances.
Best wishes...
Would it affect that?
Hi Phil,
The smooth operation of a gear box and in particular the engagement of the dogs is dependant on having only a small amount of end float. If for instance on your B40 it is 10thou and this is set without a gasket fitting a gasket could increase this to over 30 to 40 thou or more depending on the compressed thickness of the gasket. I suppose it is theoretically possible to re-shim the gearbox to compensate but I think that would take a bit of work.
Dave.
Hello Dave,
Thanks for this, Dave and Bess. Yes, I can see what you are saying Dave, except it's not obvious to me how the outer cover being further away from the inner would affect the end float. Which part of the outer cover is crucial in that? Which part of it provides a limit on the amount of end float? Phil
Hi Phil,
No, it is the inner case that affects the end float. It is a while since I had a B40 so forgive my error. I suppose one thing to do is make a gasket and try it. Does Rupert Ratio offer any suggestions for this joint face?
Dave.
Thanks Dave. I'll check RR, good idea. Phil
No gasket on the timing side Phil, just nice smooth mating faces and a very light coat of blue hylomar.
Pete
Okay, thanks, no gasket on the timing side.
The gasket I bought ( from Draganfly) for the primary chaincase seemed quite hard to me (novice) and I wonder how much it would compress with just a light tightening.
I got one in a "rebuild kit" that was just paper thin....bought one on its own and it was definitely thicker...I've just fitted it but not put any oil in yet as I'm taking the rebuild slowly...well thats my excuse and I'm sticking to it.
If you nip the bolts up evenly and then progressively tighten them, hopefully there will be no drips. I use hylomar on one side of gasket (very sparingly) and grease on the other....pretty sure thats the RR way...
Pete