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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin oil pump fitting
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<blockquote data-quote="oexing" data-source="post: 113049" data-attributes="member: 1493"><p>Bill, I do not think you will have luck heating the case when the sleeve fit is too tight and hope for turning it to align with the screw hole. The brass sleeve will heat up in a second from the warm case, expand and end of story. I definitely favour the strategy to lap the sleeve into the case with 5 micron paste to get a nice super small push fit. Heat growth of case and sleeve will be within half a thou extra gap when hot and returned to 5 micron when cold. I recommended 5 micron type of paste because that will be your clearance at the most that you get between sleeve and case. 5 micron is the size of the diamond cristals so when honing/lapping the sleeve slowly into the case and keep the rearmost outside part of the sleeve clean of paste you end up with that 5 micron clearance - a fifth of a thou in your money - along the sleeve to its final position. This is no factor at all for the running engine on the road concerning oil "pressure" and no factor for wet sumping when cold. </p><p> All other tight fits risk to end in foul words at best . . . . </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 113049, member: 1493"] Bill, I do not think you will have luck heating the case when the sleeve fit is too tight and hope for turning it to align with the screw hole. The brass sleeve will heat up in a second from the warm case, expand and end of story. I definitely favour the strategy to lap the sleeve into the case with 5 micron paste to get a nice super small push fit. Heat growth of case and sleeve will be within half a thou extra gap when hot and returned to 5 micron when cold. I recommended 5 micron type of paste because that will be your clearance at the most that you get between sleeve and case. 5 micron is the size of the diamond cristals so when honing/lapping the sleeve slowly into the case and keep the rearmost outside part of the sleeve clean of paste you end up with that 5 micron clearance - a fifth of a thou in your money - along the sleeve to its final position. This is no factor at all for the running engine on the road concerning oil "pressure" and no factor for wet sumping when cold. All other tight fits risk to end in foul words at best . . . . Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin oil pump fitting
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