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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
main bearings
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<blockquote data-quote="greg brillus" data-source="post: 103712" data-attributes="member: 597"><p>The factory stake marks were only there to stop the races falling out when the case was flipped over to install the spindles and so on, not to add any extra holding force to retain the bearings. If you have any races that are loose or not enough interference to hold the bearing, you should sleeve the housing, I prefer to do it in steel although others do it in alloy or bronze. It is less effort than you think to do it, and the results tend to work out well. Recently on one engine the customer insisted on plating the bearing oversize and ground to the correct fit. This actually worked extremely well and they ground the OD to the figures I quoted them exactly. Upon heating the case to 180 degrees Celsius the bearing dropped in nicely, as did the other new bearings.The only down side was the plating company seem to have lost the inner race of the new bearing........<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite4" alt=":mad:" title="Mad :mad:" loading="lazy" data-shortname=":mad:" />.........Which means I now have to sacrifice another new bearing. The factory specify 200 Degrees Celsius to heat the cases, but this is too hot and is close to annealing the alloy. The problem with installing an oversize bearing or loctiting a bearing in is that generally the bearing pocket is no longer truly round. Years ago to sleeve a bearing housing would be very difficult, but with a CNC mill it is not a problem at all, and not that expensive............To give some perspective.........To plate and grind the new bearing oversize is about $150 AUD whereas to bore the one bearing housing and sleeve back to standard is about $300 AUD. The case that we plated the bearing oversize was a new crankcase, not an original flogged out one, so the hole was round to start with. I don't tend to muck around with loose bearing housings anymore, I just get them machined and sleeved..........A crankcase re-sleeve to do both sides is about $600 AUD for the whole job.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 103712, member: 597"] The factory stake marks were only there to stop the races falling out when the case was flipped over to install the spindles and so on, not to add any extra holding force to retain the bearings. If you have any races that are loose or not enough interference to hold the bearing, you should sleeve the housing, I prefer to do it in steel although others do it in alloy or bronze. It is less effort than you think to do it, and the results tend to work out well. Recently on one engine the customer insisted on plating the bearing oversize and ground to the correct fit. This actually worked extremely well and they ground the OD to the figures I quoted them exactly. Upon heating the case to 180 degrees Celsius the bearing dropped in nicely, as did the other new bearings.The only down side was the plating company seem to have lost the inner race of the new bearing........:mad:.........Which means I now have to sacrifice another new bearing. The factory specify 200 Degrees Celsius to heat the cases, but this is too hot and is close to annealing the alloy. The problem with installing an oversize bearing or loctiting a bearing in is that generally the bearing pocket is no longer truly round. Years ago to sleeve a bearing housing would be very difficult, but with a CNC mill it is not a problem at all, and not that expensive............To give some perspective.........To plate and grind the new bearing oversize is about $150 AUD whereas to bore the one bearing housing and sleeve back to standard is about $300 AUD. The case that we plated the bearing oversize was a new crankcase, not an original flogged out one, so the hole was round to start with. I don't tend to muck around with loose bearing housings anymore, I just get them machined and sleeved..........A crankcase re-sleeve to do both sides is about $600 AUD for the whole job. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
main bearings
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