George Cardale Posted January 8, 2019 Report Share Posted January 8, 2019 Hi - I have an '83 Cota. I have had the gear box stripped and it is working on the bench, but there is too much movement in the gear selector drum, so it is vibrating and then jumping into gear. Does anyone have a picture or diagram showing the selector drum set up pls? Quote Link to comment Share on other sites More sharing options...
fourex Posted January 9, 2019 Report Share Posted January 9, 2019 Does this help ? Quote Link to comment Share on other sites More sharing options...
fourex Posted January 9, 2019 Report Share Posted January 9, 2019 More possibly useful info. Quote Link to comment Share on other sites More sharing options...
George Cardale Posted January 9, 2019 Author Report Share Posted January 9, 2019 Thanks very much - I have this already but the guy rebuilding it says it is difficult to match the parts to the diagram. The main issue is that the bike jumps into gear in neutral, maybe due to vibration, I can try adding some shims to firm it up, but do you think that will work? Quote Link to comment Share on other sites More sharing options...
bigshineybike Posted January 9, 2019 Report Share Posted January 9, 2019 4 hours ago, George Cardale said: Thanks very much - I have this already but the guy rebuilding it says it is difficult to match the parts to the diagram. The main issue is that the bike jumps into gear in neutral, maybe due to vibration, I can try adding some shims to firm it up, but do you think that will work? I bought my 348 and the gear selection was awful, on inspection I found there were no shims on any of the shafts. The manual suggests a complicated measurement method involving lots of adding and subtraction. I just assembled the box with its gaskets and tested end float on the shafts then made up a set of shims to take the end float to 0.1mm this helped a lot. Has your man adjusted the 01302 cam plate carefully enough using eccentric nut 107 so that neutral is selected positivly? The 349 has the aditional roller 11001 that should help positive engagement a little more. Have you got the manual? Quote Link to comment Share on other sites More sharing options...
George Cardale Posted January 9, 2019 Author Report Share Posted January 9, 2019 Thanks very much, is the manual in Spanish, if so I have it. My email address is gcardale1@gmail.com if easier Thanks for your help, much appreciated Quote Link to comment Share on other sites More sharing options...
feetupfun Posted January 10, 2019 Report Share Posted January 10, 2019 bigshineybike reminded me to mention that the 349 and many other spanish bikes of the time use 0.5 mm thick centre gasket, which is not a standard size here, but is available. The thickness of the centre gasket is important for things like the side play in the shift drum Quote Link to comment Share on other sites More sharing options...
George Cardale Posted January 10, 2019 Author Report Share Posted January 10, 2019 Yes - good point and thanks Quote Link to comment Share on other sites More sharing options...
dr nosh Posted January 19, 2019 Report Share Posted January 19, 2019 (edited) Like Bigshineybike I shimmed the shafts and the drum. I also made a shim to fit under the hex head of the eccentric adjuster 2166.107 (selector group drawing) and that reduced gearchange shaft 'slop'. Also made a bronze bush in the outer cover where the shaft exits the cover (under seal 0099.1424). So far so good. Edited January 19, 2019 by dr nosh Quote Link to comment Share on other sites More sharing options...
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