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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Sealed or unsealed gearbox bearings
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<blockquote data-quote="oexing" data-source="post: 135492" data-attributes="member: 1493"><p>Well yes, Greg, in those cases when you cannot slip a crank in its place even with a heated engine the bearing fits must be wrong. So somebody must have machined not to specification for proper fits. It pays to measure up ALL parts for exact sizes else you end up with overly tight fits - or staking to prevent races from dropping out in heated case . Seems you have to be prepared for all sorts of defects with Vincent engines - even in factory new conditions it seems. But then, even a C3 will not be allright with this in times. </p><p> Thrashing a cold engine may not be great for a tight bearing but my guess the bearing will be your smallest problem , you´d get some bigger problems in other places in no time. So what to think about preloaded taper bearings on Velocettes in cold condition, same question there ? I would not be so nervous about minor tightness in cold condition when in operating condition it is free, any lathe runs preloaded taper roller bearings all times for rigidness. You just check for a max. temperature at max. revs there for setting preload. </p><p> With the small outer roller bearing on timing side some "roughness" may be due to the cutout for the pump worm and this may be reason for out of round outer race when shrink fitted, so some feel of roughness - or so Vincent Speet told me. I am not clear about correct machining procedures of oil pump housing and boring main bearing fits and minor distortions from this with out of round effect from this. </p><p></p><p> Vic</p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 135492, member: 1493"] Well yes, Greg, in those cases when you cannot slip a crank in its place even with a heated engine the bearing fits must be wrong. So somebody must have machined not to specification for proper fits. It pays to measure up ALL parts for exact sizes else you end up with overly tight fits - or staking to prevent races from dropping out in heated case . Seems you have to be prepared for all sorts of defects with Vincent engines - even in factory new conditions it seems. But then, even a C3 will not be allright with this in times. Thrashing a cold engine may not be great for a tight bearing but my guess the bearing will be your smallest problem , you´d get some bigger problems in other places in no time. So what to think about preloaded taper bearings on Velocettes in cold condition, same question there ? I would not be so nervous about minor tightness in cold condition when in operating condition it is free, any lathe runs preloaded taper roller bearings all times for rigidness. You just check for a max. temperature at max. revs there for setting preload. With the small outer roller bearing on timing side some "roughness" may be due to the cutout for the pump worm and this may be reason for out of round outer race when shrink fitted, so some feel of roughness - or so Vincent Speet told me. I am not clear about correct machining procedures of oil pump housing and boring main bearing fits and minor distortions from this with out of round effect from this. Vic Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Sealed or unsealed gearbox bearings
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