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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin oil pump fitting
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<blockquote data-quote="Simon Dinsdale" data-source="post: 112866" data-attributes="member: 58"><p>Another thing to consider is the linear rate of coefficent of thermal expansion for the different materials. Ignoring what the number actually means:</p><p></p><p>Aluminum = 22 approx</p><p>Bronze = 16 to 18</p><p>steel = 12 approx</p><p></p><p>This means bronze expands slightly less than aluminium so heating the cases to remove the sleeve will have a little effect but not a lot. Steel roughtly expands at half the rate of aluminium which is why you heat the crankcases when removing the mains bearings.</p><p>In use the sleeve and crankcases will basically keep the same fit hot as when cold, but the sleeve will expand a bit more than the pump plunger. This is probably why the factory said the sleeve can be a push slide fit in the cases. </p><p>Usually over the years the crankcases distort slightly so the 1" bore in the cases for the pump sleeve is no longer true down it full length, ie its slightly banana shape, and so the new sleeve distorts over its length when installed.</p><p></p><p>Simon</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 112866, member: 58"] Another thing to consider is the linear rate of coefficent of thermal expansion for the different materials. Ignoring what the number actually means: Aluminum = 22 approx Bronze = 16 to 18 steel = 12 approx This means bronze expands slightly less than aluminium so heating the cases to remove the sleeve will have a little effect but not a lot. Steel roughtly expands at half the rate of aluminium which is why you heat the crankcases when removing the mains bearings. In use the sleeve and crankcases will basically keep the same fit hot as when cold, but the sleeve will expand a bit more than the pump plunger. This is probably why the factory said the sleeve can be a push slide fit in the cases. Usually over the years the crankcases distort slightly so the 1" bore in the cases for the pump sleeve is no longer true down it full length, ie its slightly banana shape, and so the new sleeve distorts over its length when installed. Simon [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin oil pump fitting
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