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27 Posts
Hi everyone,
over the last weeks I rebuilt a gearbox for the first time. I took a lot of time to check and clean and did it with as many good quality parts as I could find - means all the synchros are replaced with the Goetze ones and all the bearings have been replaced just to be sure I don't have to do the job again anytime soon.
However, while driving it the first time it made a grinding noise only when the clutch (also replaced) is engaged - means it has to be something in the gearbox.
What I found on the gearbox is that the synchros of 3. and 4. have almost no clearance to the sleeve (original sleeve of 5. gear with unused side now facing to 3. gear side). When turning it, the sleeve rubs on the opposite side of the synchro opening, which creates that grinding noise I could hear when driving. When turned by hand it can hardly be heard - pretty much only if you know it is there and pay attention to it. I guess this is why I did not spot it during the first assembly.
The clearance to the fork is within spec and the sleeve sits well centred, so the clearance to 3. is the same. Also the distance of the two dog gears is 42.2mm and already on allowed the maximum.
Comparing this to 1. and 2. gear and the new repro sleeve there, I see a lot more clearance between the sleeve teeth and the synchros. The distance of the dog rings is slightly less even and the sleeve has the same width as the original ones.
Did anyone face this issue as well or has any advice if this is just normal and the synchros just need to be worn in to stop the grinding?
I would really appreciate your opinion on this - Thanks a lot already : )
over the last weeks I rebuilt a gearbox for the first time. I took a lot of time to check and clean and did it with as many good quality parts as I could find - means all the synchros are replaced with the Goetze ones and all the bearings have been replaced just to be sure I don't have to do the job again anytime soon.
However, while driving it the first time it made a grinding noise only when the clutch (also replaced) is engaged - means it has to be something in the gearbox.
What I found on the gearbox is that the synchros of 3. and 4. have almost no clearance to the sleeve (original sleeve of 5. gear with unused side now facing to 3. gear side). When turning it, the sleeve rubs on the opposite side of the synchro opening, which creates that grinding noise I could hear when driving. When turned by hand it can hardly be heard - pretty much only if you know it is there and pay attention to it. I guess this is why I did not spot it during the first assembly.
The clearance to the fork is within spec and the sleeve sits well centred, so the clearance to 3. is the same. Also the distance of the two dog gears is 42.2mm and already on allowed the maximum.
Comparing this to 1. and 2. gear and the new repro sleeve there, I see a lot more clearance between the sleeve teeth and the synchros. The distance of the dog rings is slightly less even and the sleeve has the same width as the original ones.
Did anyone face this issue as well or has any advice if this is just normal and the synchros just need to be worn in to stop the grinding?
I would really appreciate your opinion on this - Thanks a lot already : )