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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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<blockquote data-quote="tatty500" data-source="post: 29259" data-attributes="member: 2532"><p>Clevtrev,</p><p>Thanks for doing those measurements.</p><p></p><p>That means your output gear is deeper/longer from the bearing shoulder to the face. On my gear this distance is 26.2mm, so is yours 26.7?</p><p> </p><p>My gear was the smallest by 0.25mm and my box the deepest by nearly 0.5mm……..but these biggest discrepancies were relative to the pre-war box. </p><p>Relative to the other post war box, my gear was down by 0.1mm and case deeper by 0.3mm. </p><p></p><p>Unfortunately, the face that fits against the o/p bearing isn’t dead square. The radius on the bearing inner bore is quite large and the contact patch on the gear has become more round shouldered than me. In fact , doing the sums, it must be that the gear is only 25.8mm deep to the actual contact of the shoulder on the bearing. We must also take account of my possible measuring errors. I found measuring to the small bit of visible bearing quite tricky with the depth prong on a vernier calliper.</p><p>When doing the comparisons I only measured differences for this very reason.</p><p></p><p>But, the face of your gear is a full 1mm further into the box, so how much further can it be pushed through the bearing before it bumps into the big diameter part of the selector shaft? Is this only 1mm as opposed to the 2mm on mine?</p><p></p><p>Your box presumably shows a desirable 3mm or more of dog engagement which I am providing with my offset selector pin and big shim washer…….</p><p></p><p>Thanks,</p><p>Tatty</p><p>PS don’t know why the pics ended up in that order.</p></blockquote><p></p>
[QUOTE="tatty500, post: 29259, member: 2532"] Clevtrev, Thanks for doing those measurements. That means your output gear is deeper/longer from the bearing shoulder to the face. On my gear this distance is 26.2mm, so is yours 26.7? My gear was the smallest by 0.25mm and my box the deepest by nearly 0.5mm……..but these biggest discrepancies were relative to the pre-war box. Relative to the other post war box, my gear was down by 0.1mm and case deeper by 0.3mm. Unfortunately, the face that fits against the o/p bearing isn’t dead square. The radius on the bearing inner bore is quite large and the contact patch on the gear has become more round shouldered than me. In fact , doing the sums, it must be that the gear is only 25.8mm deep to the actual contact of the shoulder on the bearing. We must also take account of my possible measuring errors. I found measuring to the small bit of visible bearing quite tricky with the depth prong on a vernier calliper. When doing the comparisons I only measured differences for this very reason. But, the face of your gear is a full 1mm further into the box, so how much further can it be pushed through the bearing before it bumps into the big diameter part of the selector shaft? Is this only 1mm as opposed to the 2mm on mine? Your box presumably shows a desirable 3mm or more of dog engagement which I am providing with my offset selector pin and big shim washer……. Thanks, Tatty PS don’t know why the pics ended up in that order. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
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