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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Layshaft bearing problems
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<blockquote data-quote="greg brillus" data-source="post: 101055" data-attributes="member: 597"><p>Vic I'm not sure there is a right or wrong answer. The series "A" machines used a large steel insert in the drive side to support the main bearings. I was a little worried when we first did this that when installing an aluminium alloy type sleeve, that it could expand rapidly as it goes into the case, and grab. I doubt this might happen, but who knows. I have seen brass sleeves before.........I feel that a steel sleeve is actually increasing the size of the outer race, and that seemed to be the best solution to me. We have done probably at least 10 crank cases this way now, and we use to also make the sleeves with a hat section on them, mostly on the drive side. It really involves increasing the surface area of the bearing/case housing without machining the housing too large that you weaken the housing too much. I have seen this done on some engines that can ultimately end in destruction if too much strength is lost, particularly on chopped twin engines where too much of the original primary housing has been completely removed, and main bearing tunnels opened too far. It split the case right through the drive side main bearing housing because of this.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 101055, member: 597"] Vic I'm not sure there is a right or wrong answer. The series "A" machines used a large steel insert in the drive side to support the main bearings. I was a little worried when we first did this that when installing an aluminium alloy type sleeve, that it could expand rapidly as it goes into the case, and grab. I doubt this might happen, but who knows. I have seen brass sleeves before.........I feel that a steel sleeve is actually increasing the size of the outer race, and that seemed to be the best solution to me. We have done probably at least 10 crank cases this way now, and we use to also make the sleeves with a hat section on them, mostly on the drive side. It really involves increasing the surface area of the bearing/case housing without machining the housing too large that you weaken the housing too much. I have seen this done on some engines that can ultimately end in destruction if too much strength is lost, particularly on chopped twin engines where too much of the original primary housing has been completely removed, and main bearing tunnels opened too far. It split the case right through the drive side main bearing housing because of this. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Layshaft bearing problems
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