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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Installing ET92 Inner Roller Set on Mainshaft
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<blockquote data-quote="oexing" data-source="post: 147984" data-attributes="member: 1493"><p>Bearing steels are not case hardened, these are through hardening steels with high carbon and a bit of chrome. So you can take out a lot of material , like for different size of needles , and still correct hardness .</p><p> Tight big end bearings are a safe way to cathastrophe as nil clearance will not get better with a warm engine - all steel, same heat growth. </p><p> A different situation with bearings sitting in the alu cases: I do my calculations for shrink fits with target of outer races getting loose at around 100 degrees C so in normal use races stay put and no relevant reduction of running clearance at operating condition will be seen. I don´t mind having some minor drag in the bearing while the cases are cold. You don´t run a bike with cold cases for long time so I don´t see why one should mess up a new bearing by questionable "lapping" stunts - provided all sizes in engine cases and shaft diameters are within specs. A small amount of "preload" in the cold bearing sitting in the alu case is not a big deal , think of Velocettes or maybe HDs with taper roller bearings for crank main bearings: These require a certain preload of some thou in cold engine as the hot case will expand and when not setting preloads before you´d end with excessive play in a hot engine. </p><p> So check sizes in case and shafts for correct dimensions. Well, you should be prepared to find all sorts of defects in ancient engines with unknown history so no simple job here . . . </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 147984, member: 1493"] Bearing steels are not case hardened, these are through hardening steels with high carbon and a bit of chrome. So you can take out a lot of material , like for different size of needles , and still correct hardness . Tight big end bearings are a safe way to cathastrophe as nil clearance will not get better with a warm engine - all steel, same heat growth. A different situation with bearings sitting in the alu cases: I do my calculations for shrink fits with target of outer races getting loose at around 100 degrees C so in normal use races stay put and no relevant reduction of running clearance at operating condition will be seen. I don´t mind having some minor drag in the bearing while the cases are cold. You don´t run a bike with cold cases for long time so I don´t see why one should mess up a new bearing by questionable "lapping" stunts - provided all sizes in engine cases and shaft diameters are within specs. A small amount of "preload" in the cold bearing sitting in the alu case is not a big deal , think of Velocettes or maybe HDs with taper roller bearings for crank main bearings: These require a certain preload of some thou in cold engine as the hot case will expand and when not setting preloads before you´d end with excessive play in a hot engine. So check sizes in case and shafts for correct dimensions. Well, you should be prepared to find all sorts of defects in ancient engines with unknown history so no simple job here . . . Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Installing ET92 Inner Roller Set on Mainshaft
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