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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Migration of oil
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<blockquote data-quote="timetraveller" data-source="post: 52890" data-attributes="member: 456"><p>Why do you think that the oil is going from the gearbox to the engine? I would expect discoloured gearbox oil to be a sign of oil going the other way, i.e. engine to gearbox. Is the oil tank filling up and the oil level in the gearbox going down? A typical scenario is engine oil going into the primary chain case through the drive side main bearings and filling that up to the extent that either it blows out behind the dynamo drive or somehow gets past poor sealing into the gearbox. I would smell the oil in the gearbox and if it smells like used engine oil then that is probably what it is. No need at this stage for finding someone to do a chemical analysis. Your nose is relatively good at that. If it does not smell like used engine oil then it sounds like something in the gearbox is getting so hot that it is carbonising the oil and that is not good news. Did you try draining the gearbox oil and looking for particle in it? A magnet will quickly let you know whether they are steel or something else (ali or bronze). Good luck with it.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 52890, member: 456"] Why do you think that the oil is going from the gearbox to the engine? I would expect discoloured gearbox oil to be a sign of oil going the other way, i.e. engine to gearbox. Is the oil tank filling up and the oil level in the gearbox going down? A typical scenario is engine oil going into the primary chain case through the drive side main bearings and filling that up to the extent that either it blows out behind the dynamo drive or somehow gets past poor sealing into the gearbox. I would smell the oil in the gearbox and if it smells like used engine oil then that is probably what it is. No need at this stage for finding someone to do a chemical analysis. Your nose is relatively good at that. If it does not smell like used engine oil then it sounds like something in the gearbox is getting so hot that it is carbonising the oil and that is not good news. Did you try draining the gearbox oil and looking for particle in it? A magnet will quickly let you know whether they are steel or something else (ali or bronze). Good luck with it. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Migration of oil
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