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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Change
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<blockquote data-quote="timetraveller" data-source="post: 45813" data-attributes="member: 456"><p>I'm with clevtrev on this. Over the years I have taken apart many flywheel assemblies both for myself and for other people (a hobby not a business). In every case the failure of the big end has been due to the annular groove in the timing end of the crankpin being filled solid with dirt centrifuged out of the oil. This has built up until oil could no longer flow into the crank pin and hence the failure. The crank pins with larger diameter ends where they enter the flywheels, originally developed for racing to give more stiffness, do not have this groove. Instead they have to have the entrance for the oil gallery in the crankpin lined up with the hole in the timing side flywheel and there is nowhere for the dirt to go other than straight through to the big end bearing. Modern filters, provided that they are free flow, are a much better item.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 45813, member: 456"] I'm with clevtrev on this. Over the years I have taken apart many flywheel assemblies both for myself and for other people (a hobby not a business). In every case the failure of the big end has been due to the annular groove in the timing end of the crankpin being filled solid with dirt centrifuged out of the oil. This has built up until oil could no longer flow into the crank pin and hence the failure. The crank pins with larger diameter ends where they enter the flywheels, originally developed for racing to give more stiffness, do not have this groove. Instead they have to have the entrance for the oil gallery in the crankpin lined up with the hole in the timing side flywheel and there is nowhere for the dirt to go other than straight through to the big end bearing. Modern filters, provided that they are free flow, are a much better item. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Change
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