Trans knock video. Not for the faint of heart!

[deezgunz]

I opened up the transmission and removed the layshaft and the gears that came off the shaft. The housing, gears, bearings etc. proved to be clean and healthy. See pics:






This points to the bronze shaft bushing (cedryck/safeairone)! I feel confident with this diagnosis as I had a similar issue with my 109. I tend to overcomplicate things and now that I'm retired I have too much time on my hands. I'm going to button up the trans with new seals and install a new bushing. I'll post an update when i'm done. Thanks to all!

[Bud]

Please run your engine with the tranny removed. I just skimmed through the thread, but I'm not positive the tranny is your problem - hopefully it is.

[deezgunz]

Bud, excellent suggestion to rule out (or in) a possible engine problem. Started fine with no knocking so I'm sticking with the worn bushing.

Please run your engine with the tranny removed. I just skimmed through the thread, but I'm not positive the tranny is your problem - hopefully it is.

[Apis Mellifera]

Something I discovered years ago: those holes perpendicular to the shift fork shafts, the ones for the detent balls and springs, I'd recommend replacing the top cover and drilling the holes back to round and slightly larger to make sure the balls and springs don't bind. This allows the balls to positively engage the grooves in the shafts and has cured mine from jumping out of gear.

[Les Parker]

Standing the trans on the brake drum (upright) with a wooden block supporting the rest of the trans. has worked for me to reassemble both Series IIa and Series III transmissions. Hope this helps.
How did it all pan out ?