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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin oil pump fitting
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<blockquote data-quote="greg brillus" data-source="post: 112902" data-attributes="member: 597"><p>It's generally the inner large race that hits, unless the outer one has moved and quite possible. Often the damage is done removing the old sleeve as it can get nicks on it from removing the crank and/or if something has been up the inlet port in the cases. This later one is the bad one, if the case is scored from there outward, this will cause oil to leak past the outside of the sleeve. I generally remove the high spots in the case bore and using a nice coating of non hardening sealant seems to stop any further leakage. Another spot that goes unnoticed, is the lower timing cover screw the one next rearward from the one with the locating dowel........If too long a cover screw is wound right to the bottom of this hole, it will punch through into the oil pump bore and damage the sleeve, again causing a score in the bore..........Removing and changing oil pumps can be fraught with danger i'm afraid............<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite12" alt="o_O" title="Er... what? o_O" loading="lazy" data-shortname="o_O" /> ........</p></blockquote><p></p>
[QUOTE="greg brillus, post: 112902, member: 597"] It's generally the inner large race that hits, unless the outer one has moved and quite possible. Often the damage is done removing the old sleeve as it can get nicks on it from removing the crank and/or if something has been up the inlet port in the cases. This later one is the bad one, if the case is scored from there outward, this will cause oil to leak past the outside of the sleeve. I generally remove the high spots in the case bore and using a nice coating of non hardening sealant seems to stop any further leakage. Another spot that goes unnoticed, is the lower timing cover screw the one next rearward from the one with the locating dowel........If too long a cover screw is wound right to the bottom of this hole, it will punch through into the oil pump bore and damage the sleeve, again causing a score in the bore..........Removing and changing oil pumps can be fraught with danger i'm afraid............o_O ........ [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin oil pump fitting
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