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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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<blockquote data-quote="oexing" data-source="post: 132912" data-attributes="member: 1493"><p>In ideal life the outer races in an engine alu case should stiill be gripped at around 100 degrees, else they would walk and bores will be oversize in time. So with a cold engine the outer race will be clamped one or two thou and internal play in the bearing will be nil. So for assembling the engine just heat it to 50-60 degrees C and all will be loose enough for slipping in place. I don´t care about minimal tightness in bearings at cold - you cannot run an engine with a cold case for more than a few minutes, it will heat up and at normal running condition you get standard play in all bearings. This is just something you have to keep in mind when having a material mix of alu and steel and changing temperatures. </p><p> As to preload on bearings: The Velocette and some HDs have Timken bearings for mains, so in these cases you set them with a certain preload when cold. Otherwise you´d get a lot of play when the alu case expands with heat. </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 132912, member: 1493"] In ideal life the outer races in an engine alu case should stiill be gripped at around 100 degrees, else they would walk and bores will be oversize in time. So with a cold engine the outer race will be clamped one or two thou and internal play in the bearing will be nil. So for assembling the engine just heat it to 50-60 degrees C and all will be loose enough for slipping in place. I don´t care about minimal tightness in bearings at cold - you cannot run an engine with a cold case for more than a few minutes, it will heat up and at normal running condition you get standard play in all bearings. This is just something you have to keep in mind when having a material mix of alu and steel and changing temperatures. As to preload on bearings: The Velocette and some HDs have Timken bearings for mains, so in these cases you set them with a certain preload when cold. Otherwise you´d get a lot of play when the alu case expands with heat. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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