3 replies to this topic

[Sillsy]

Hi everyone, i have recently just finished rebuilding my first gearbox with new bearings and baulk rings but iam finding that the mainshaft is quite stiff to turn by hand. Is this normal or should it spin fairly freely. When looking at the box to see why it was a bit stiff it looked like the 4th gear baulk ring was binding. Any help from you guys would be greatly appreciated thanks.

[Petes.one]

If the sychro hubs are not exactly in the neutral position when you install the mainshaft it's easy to have the third/fourth gear selector fork disengaged from the bell-crank underneath it. Once you tighten up the mainshaft then the third/fourth gear sychro will be jammed out of position and the shaft won't turn properly. If that's your problem the selector shaft will not be able to move the forks to select gears, so you can tell straight away. You would need to remove the mainshaft, get the third/fourth selector fork in the correct position, and try again. Happened to me on my first build!!

[Guess-Works.com]

I'm experiencing the same issues with baulkrings at the moment... some are seeming to be machined on tighter tolerances than others which will cause binding.

The solution is to swap baulks around until you get a good fit, helps if you have more than 4 to play with, or use genuine parts..

Well oil the parts when assembling, and don't forget when you've torqued up the box, this increases the space for the 3rd/4th synchro to move by pulling the input gear out one way and the 3rd motion shaft the other.

I also run my gearboxes with a cordless drill to check all the gears function before the go out

[Sillsy]

Thanks for your help guys, i will remove the mainshaft, check the syncros and change around the baulk rings.