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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Layshaft bearing problems
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<blockquote data-quote="Black Flash" data-source="post: 100942" data-attributes="member: 433"><p>Hello Chris, </p><p>Get a new bearing and be sure it's a C3 tolerance bearing. Try at least to buy it from a different source so you are more likely to get one from a different production batch. The bearing tolerance classes do overlap. So a tighter C3 bearing could well be sold as a standard bearing. Usually the bearing tolerance gets checked after manufacture and then bearings get grouped and the bearings stamped after demand. So if a manufacturer gets a big order for standard size bearings, they will get produced and those with more play will be be put aside and sold as C3 if there are orders coming in as well as standard. </p><p>Simply try another bearing from another source. Of course first measure your shaft and housing. In an big hefty alloy housing about 1 third to 1 quarter of the interference goes into the outer ring reducing the play, in a thin walled alloy housing it is less. On a steel shaft 80% of the interference goes into expansion of the inner ring, so you may need to lap your shaft. </p><p>These are proven rules of thumb.</p><p>Do not forget we are talking about microns when it comes to play in C2, CN, or C3 bearings. </p><p>But as I said before try a new bearing first before fettling with the bore especially </p><p>Cheers Bernd</p></blockquote><p></p>
[QUOTE="Black Flash, post: 100942, member: 433"] Hello Chris, Get a new bearing and be sure it's a C3 tolerance bearing. Try at least to buy it from a different source so you are more likely to get one from a different production batch. The bearing tolerance classes do overlap. So a tighter C3 bearing could well be sold as a standard bearing. Usually the bearing tolerance gets checked after manufacture and then bearings get grouped and the bearings stamped after demand. So if a manufacturer gets a big order for standard size bearings, they will get produced and those with more play will be be put aside and sold as C3 if there are orders coming in as well as standard. Simply try another bearing from another source. Of course first measure your shaft and housing. In an big hefty alloy housing about 1 third to 1 quarter of the interference goes into the outer ring reducing the play, in a thin walled alloy housing it is less. On a steel shaft 80% of the interference goes into expansion of the inner ring, so you may need to lap your shaft. These are proven rules of thumb. Do not forget we are talking about microns when it comes to play in C2, CN, or C3 bearings. But as I said before try a new bearing first before fettling with the bore especially Cheers Bernd [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Layshaft bearing problems
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