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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Dynamo/Alternator
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<blockquote data-quote="Hugo Myatt" data-source="post: 2347" data-attributes="member: 99"><p><strong>Comet Oil Leaks</strong></p><p></p><p>It is very difficult to pinpoint the actual source of oil leaks as the wind flow under the bike follows some very strange contortions that seem to defy logic and often bring the oil forward rather than back. The usual suspects include the chain oiler, the valve lifter mechanism, the oil pump end cap and the grub screw sealing the oilway drilling at the bottom of the crankcase. This last is difficult to seal in situ as it is has a head of oil behind it. However on Comets it seems to be mostly the Burman gearbox. The kickstart and gearlever shafts and the clutch adjuster are all below the level of the mainshaft and when everything is spinning, oil and grease is chucked everywhere. I had mine rebuit with oil seals on the shafts but if I add any oil to the box, (it is packed with Sperol semi fluid grease) for the sake of the layshaft bearing, the oil soon reappears on the outside. There is also a core plug on the inboard end of the layshaft which is difficult to seal and is sometimes missing altogether. Mr. Burman's philosophy regarding gearbox lubrication seems to be lost in the mists of time. The works recommended a grease/oil mixture which I believe led to some interesting fires when they boiled up the concoction in order to fill the gearboxes.</p></blockquote><p></p>
[QUOTE="Hugo Myatt, post: 2347, member: 99"] [b]Comet Oil Leaks[/b] It is very difficult to pinpoint the actual source of oil leaks as the wind flow under the bike follows some very strange contortions that seem to defy logic and often bring the oil forward rather than back. The usual suspects include the chain oiler, the valve lifter mechanism, the oil pump end cap and the grub screw sealing the oilway drilling at the bottom of the crankcase. This last is difficult to seal in situ as it is has a head of oil behind it. However on Comets it seems to be mostly the Burman gearbox. The kickstart and gearlever shafts and the clutch adjuster are all below the level of the mainshaft and when everything is spinning, oil and grease is chucked everywhere. I had mine rebuit with oil seals on the shafts but if I add any oil to the box, (it is packed with Sperol semi fluid grease) for the sake of the layshaft bearing, the oil soon reappears on the outside. There is also a core plug on the inboard end of the layshaft which is difficult to seal and is sometimes missing altogether. Mr. Burman's philosophy regarding gearbox lubrication seems to be lost in the mists of time. The works recommended a grease/oil mixture which I believe led to some interesting fires when they boiled up the concoction in order to fill the gearboxes. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Dynamo/Alternator
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