18-07-2023, 01:59 AM
Having dismantled the box so as to replace the roller bearing with the bronze bush (thank you David) I notice some serious wear on the teeth of the 3/4 synchroniser sleeve and corresponding wear on the mating 1st motion synchoniser gear. The gears have obviously not been mating correctly probably for a significant time. It explains why, following replacement of the main bearings a couple of years ago, the gear stick tended to jump up following the engagement of top gear as the teeth settled back into the worn part of the gear.
I hope that the photos i am going to post (if I can work out how) will show the wear. It leaves me in somewhat of a quandary as I don't want to delay the reassembly of the gearbox and I do not know yet whether a new gear and sleeve can be purchased. I'll be looking at all A7 suppliers.
It has occurred to me that perhaps I could reverse the synchro cone gearwheel and thus obtain a deeper engagement of the synchro sleeve but I have not yet attempted to disassemble the first motion shaft to this extent.
Suggestions would be appreciated.
I hope that the photos i am going to post (if I can work out how) will show the wear. It leaves me in somewhat of a quandary as I don't want to delay the reassembly of the gearbox and I do not know yet whether a new gear and sleeve can be purchased. I'll be looking at all A7 suppliers.
It has occurred to me that perhaps I could reverse the synchro cone gearwheel and thus obtain a deeper engagement of the synchro sleeve but I have not yet attempted to disassemble the first motion shaft to this extent.
Suggestions would be appreciated.