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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Main bearing race splitting?
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<blockquote data-quote="greg brillus" data-source="post: 179771" data-attributes="member: 597"><p>Also worth noting, is often, the bearing bores are not round, once the bearing shifts and rotates, it starts to wear the housing out of round.......same happens to loose spindles.......the bores don't stay round.......conrods that have had a hard life.......the bores go out of round.......cases get more heat in them than you might think.......here in Aussie, hot climate, after a good run on a summers day I've seen the cases at 140 degrees after they heat soak for 10 mins or so. The big factor here to is the crank has 4 main bearings, so alignment of the crank assembly is much more critical than most other engines with only one bearing on either side......The original flywheels are not a high grade of steel, so a big over rev or something similar and the wheels shift ........this can then put both main shafts out of alignment........I wish I had your machining skills Vic.......Good stuff you've done there.....Cheers.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 179771, member: 597"] Also worth noting, is often, the bearing bores are not round, once the bearing shifts and rotates, it starts to wear the housing out of round.......same happens to loose spindles.......the bores don't stay round.......conrods that have had a hard life.......the bores go out of round.......cases get more heat in them than you might think.......here in Aussie, hot climate, after a good run on a summers day I've seen the cases at 140 degrees after they heat soak for 10 mins or so. The big factor here to is the crank has 4 main bearings, so alignment of the crank assembly is much more critical than most other engines with only one bearing on either side......The original flywheels are not a high grade of steel, so a big over rev or something similar and the wheels shift ........this can then put both main shafts out of alignment........I wish I had your machining skills Vic.......Good stuff you've done there.....Cheers. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Main bearing race splitting?
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