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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: 135444" data-attributes="member: 1493"><p>With motorbike engines I never cared about C 3 bearing types. Keep in mind the bearings sit in alu cases so when at operating temperatures they are almost loose or even spinning in the bores with wear in consequence. So really they may be a bit tight with a cold engine but who drives a cold engine, not very long. Remember any Velocette got a preload when cold with their taper roller mains else you´d get sloppy crankshaft when all expands. So that cold preload does not hurt taper or cylinder roller bearings at all. Only matter is you may have to warm the case when assembling all internals , no bad practice anyway. </p><p> Sealed bearings may be used as they come, even with oil fill in engine. One could discuss what´s worse to bearings, lifetime clean grease filling - or contaminated engine oil ?? Most likely the grease will last better for thousands of hours than with dirt loaded engine or gearbox oil. </p><p> The poorly designed sprocket steel bush plus ESA springs preload onto sprocket acting on the inner race may be improved with a top hat steel bush for getting a lot more of space spreading forces from springs and reducing wear on the inner mainbearing race and sprocket . This can look a bit like in my photo, when you face turn the (ball) bearing inner race till the radius is gone mostly. So the gained space will be filled with the top hat bush for longer use. </p><p></p><p> Vic</p><p>[ATTACH=full]40698[/ATTACH]</p><p></p><p></p><p>[ATTACH=full]40699[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 135444, member: 1493"] With motorbike engines I never cared about C 3 bearing types. Keep in mind the bearings sit in alu cases so when at operating temperatures they are almost loose or even spinning in the bores with wear in consequence. So really they may be a bit tight with a cold engine but who drives a cold engine, not very long. Remember any Velocette got a preload when cold with their taper roller mains else you´d get sloppy crankshaft when all expands. So that cold preload does not hurt taper or cylinder roller bearings at all. Only matter is you may have to warm the case when assembling all internals , no bad practice anyway. Sealed bearings may be used as they come, even with oil fill in engine. One could discuss what´s worse to bearings, lifetime clean grease filling - or contaminated engine oil ?? Most likely the grease will last better for thousands of hours than with dirt loaded engine or gearbox oil. The poorly designed sprocket steel bush plus ESA springs preload onto sprocket acting on the inner race may be improved with a top hat steel bush for getting a lot more of space spreading forces from springs and reducing wear on the inner mainbearing race and sprocket . This can look a bit like in my photo, when you face turn the (ball) bearing inner race till the radius is gone mostly. So the gained space will be filled with the top hat bush for longer use. Vic [ATTACH type="full"]40698[/ATTACH] [ATTACH type="full"]40699[/ATTACH] [/QUOTE]
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Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Sealed or unsealed gearbox bearings
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