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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Partial Single Seizure? Safe to ride?
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<blockquote data-quote="oexing" data-source="post: 99561" data-attributes="member: 1493"><p>Well, I typed this last night but forgot to send <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" />:</p><p></p><p>After a bad seizure you can expect the piston to be a LOT smaller in diameter than before. It is sort of heat treatment in these marks and the Jag pistons were about 10 or 20 thou smaller , rattled a bit when cold but we could drive home no problems at all another 300 km, no ugly noises when hot.</p><p> As to seizures, in case the seized cylinder from CoreyL gets inspected, I´d be very interested in seeing all of the bore plus piston. For checking geometrical roundness, set the cylinder on a mill and use a clock in the spindle rotated by hand . That should show any defects in roundness all along the liner down to the part that goes into the crank case. Still I suspect poorly honed liners, producing regular marks as in the Jag examples. Also, I would not exclude deformations when pushing liners into the crank case with slight force. I would not accept even minimal resistance when plunging them into the case for fear of deformation. You cannot be sure that case halves get mated perfectly with all those old position bushes in their (oversize?) bores after many decades of butchering.</p><p> So considering all possible flaws on aged Vincent components I would not dare to state causes for seizures without having measured all relevant components of that particular engine. It is too easy to draw wrong conclusions on hearsay.</p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 99561, member: 1493"] Well, I typed this last night but forgot to send :rolleyes:: After a bad seizure you can expect the piston to be a LOT smaller in diameter than before. It is sort of heat treatment in these marks and the Jag pistons were about 10 or 20 thou smaller , rattled a bit when cold but we could drive home no problems at all another 300 km, no ugly noises when hot. As to seizures, in case the seized cylinder from CoreyL gets inspected, I´d be very interested in seeing all of the bore plus piston. For checking geometrical roundness, set the cylinder on a mill and use a clock in the spindle rotated by hand . That should show any defects in roundness all along the liner down to the part that goes into the crank case. Still I suspect poorly honed liners, producing regular marks as in the Jag examples. Also, I would not exclude deformations when pushing liners into the crank case with slight force. I would not accept even minimal resistance when plunging them into the case for fear of deformation. You cannot be sure that case halves get mated perfectly with all those old position bushes in their (oversize?) bores after many decades of butchering. So considering all possible flaws on aged Vincent components I would not dare to state causes for seizures without having measured all relevant components of that particular engine. It is too easy to draw wrong conclusions on hearsay. Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Partial Single Seizure? Safe to ride?
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