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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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<blockquote data-quote="Matty" data-source="post: 28830" data-attributes="member: 1339"><p><span style="font-family: 'arial'">Hi All</span></p><p><span style="font-family: 'arial'"></span></p><p><span style="font-family: 'arial'">Just an update with my latest findings now that I have the "new" gearbox casing to replace the old damaged one I have been using since 1957, but which now has a loose, leaky output bearing in the casing.</span></p><p><span style="font-family: 'arial'"></span><span style="font-family: 'arial'">With this "new" casing I have been playing around with the damaged parts - layshaft with gears, output gear, sliding dog gears and selector shaft with damaged and melted 3/4th gear selector fork, ex Vic Yuole which were sent to me by "tatty500". Have fitted a new output bearing in the "new" casing and it seems to me that the 4th gear dogs engage by about 3.3mm with all the bits pulled in the worst direction - <u>providing that there is no end float on the selector shaft.</u></span></p><p> </p><p><span style="font-family: 'arial'">I can not of course measure the end float in my gearbox yet because the middle part of the casing is still on my bike.</span></p><p> </p><p><span style="font-family: 'arial'">However when I do take my box out and rebuild it, I think I may have to do two things to ensure better 4th gear engagement:-</span></p><p> </p><p><span style="font-family: 'arial'">Firstly I aim to put a 1mm spacer between the output gear and its bearing - this spacer would be 1 and a half inches internal diameter and about 2" outside diameter. Perhaps another may be needed between the chain drive sprocket and the output gear to re-align the chain, if there is enough thread for the large nut? This would provide another 1mm of dog engagement and the output gear would not quite touch the selector shaft, other gears etc.by 1mm or so!!</span></p><p> </p><p><span style="font-family: 'arial'">Secondly I would try to eliminate any end float in the selector shaft by putting suitable hardened shims behind the roller bearing end of the shaft.</span></p><p> </p><p><span style="font-family: 'arial'">Do these two ideas seem OK please?</span></p><p><span style="font-family: 'arial'"></span></p><p><span style="font-family: 'arial'">Am at present looking for the shims and spacers so that I have all the bits when I start on my gearbox rebuild in a few weeks time.</span></p><p><span style="font-family: 'arial'"></span></p><p><span style="font-family: 'arial'">Matty</span></p><p> </p><p> </p></blockquote><p></p>
[QUOTE="Matty, post: 28830, member: 1339"] [FONT=arial]Hi All Just an update with my latest findings now that I have the "new" gearbox casing to replace the old damaged one I have been using since 1957, but which now has a loose, leaky output bearing in the casing. [/FONT][FONT=arial]With this "new" casing I have been playing around with the damaged parts - layshaft with gears, output gear, sliding dog gears and selector shaft with damaged and melted 3/4th gear selector fork, ex Vic Yuole which were sent to me by "tatty500". Have fitted a new output bearing in the "new" casing and it seems to me that the 4th gear dogs engage by about 3.3mm with all the bits pulled in the worst direction - [U]providing that there is no end float on the selector shaft.[/U][/FONT] [FONT=arial] [/FONT] [FONT=arial]I can not of course measure the end float in my gearbox yet because the middle part of the casing is still on my bike.[/FONT] [FONT=arial] [/FONT] [FONT=arial]However when I do take my box out and rebuild it, I think I may have to do two things to ensure better 4th gear engagement:-[/FONT] [FONT=arial] [/FONT] [FONT=arial]Firstly I aim to put a 1mm spacer between the output gear and its bearing - this spacer would be 1 and a half inches internal diameter and about 2" outside diameter. Perhaps another may be needed between the chain drive sprocket and the output gear to re-align the chain, if there is enough thread for the large nut? This would provide another 1mm of dog engagement and the output gear would not quite touch the selector shaft, other gears etc.by 1mm or so!![/FONT] [FONT=arial] [/FONT] [FONT=arial]Secondly I would try to eliminate any end float in the selector shaft by putting suitable hardened shims behind the roller bearing end of the shaft.[/FONT] [FONT=arial] [/FONT] [FONT=arial]Do these two ideas seem OK please? Am at present looking for the shims and spacers so that I have all the bits when I start on my gearbox rebuild in a few weeks time. Matty[/FONT] [FONT=arial] [/FONT] [FONT=arial] [/FONT] [FONT=arial] [/FONT] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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