- Joined
- Sep 15, 2020
- Messages
- 510
OK '66 N15CS. I plead ignorance, this was the first gearbox I've rebuilt, full stop Now, it shifts OK, and some issues I am experiencing may be the nature of this beast. It's not terrible but I hope to improve. I had a '66 Triumph which had short snickety-snick throws and easy engagement. Expectations may be too high. It's just... not... great. I want to sort it out if possible, but can live with it if it's how they are.
I took great care rebuilding the gearbox, and it functions without leaking or jumping out of gear. But it (1) takes long, deliberate shifts (2) has a false neutral between 2nd and 3rd, and (3), sometimes (rarely, if not deliberately downshifted) gets caught in an intermediate state where it is clacking - ugh, metal on metal gear noises ensue.
When rebuilding, I recall that the gearbox seemed very sensitive to the two screws that are on the forward end of the box - the cam plate spindle screws. I also recall having leakage problems with the O-rings that were supplied with the Andover Norton kit and had to fix those using different O-rings. Anyway, the leaks are solved, but .. is there an adjustment to these cam plate screws that must be made? It seems (from memory) that if I back them out things loosen up and get better, but I don't want them to rattle out. If I recall correctly they are sort of acting on a spring but I can't see it by the diagram - it's been a while and I forgot. I think they are screw and washer 22/21 which go into O-ring and bush 12/20.
Are these adjusters in some way? They seemed to be but I haven't figured it out. Any help is greatly appreciated, the bike is fun to ride and I'm working out the inevitable teething issues and learning how she goes now that she's alive again.
I took great care rebuilding the gearbox, and it functions without leaking or jumping out of gear. But it (1) takes long, deliberate shifts (2) has a false neutral between 2nd and 3rd, and (3), sometimes (rarely, if not deliberately downshifted) gets caught in an intermediate state where it is clacking - ugh, metal on metal gear noises ensue.
When rebuilding, I recall that the gearbox seemed very sensitive to the two screws that are on the forward end of the box - the cam plate spindle screws. I also recall having leakage problems with the O-rings that were supplied with the Andover Norton kit and had to fix those using different O-rings. Anyway, the leaks are solved, but .. is there an adjustment to these cam plate screws that must be made? It seems (from memory) that if I back them out things loosen up and get better, but I don't want them to rattle out. If I recall correctly they are sort of acting on a spring but I can't see it by the diagram - it's been a while and I forgot. I think they are screw and washer 22/21 which go into O-ring and bush 12/20.
Are these adjusters in some way? They seemed to be but I haven't figured it out. Any help is greatly appreciated, the bike is fun to ride and I'm working out the inevitable teething issues and learning how she goes now that she's alive again.
Last edited: