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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Draining Oil
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<blockquote data-quote="timetraveller" data-source="post: 23027" data-attributes="member: 456"><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">Over the years I have probably taken apart more than 20 Vincent flywheel assemblies for various reasons, sometimes when the big ends had failed. This is much less than the professionals in the Club but more than most. In almost every case where this crank pin had the annular groove for the oil feed as in the original Vincent big ends and the early Alphas this groove was full with a hard packed mixture of carbon and aluminium debris. This had centrifuged out of the oil and was packed so hard that eventually it cuts the flow of oil to the big end which results in failure. All these engines had the standard Vincent felt filter in them but how often it and the oil had been changed is generally unknown. A magnet is not going to collect either the hard carbon or aluminium. Clearly the standard Vincent filter is inadequate and suggestions to leave out any filter strike me as either unfortunate or incompetent. The modern paper filters should be better although I have no personal experience of them. The fitting of a modern free flow filter in the return line must also be a good thing. A way round this ‘centrifugal filter’ is to fit an oversize crank pin which does not have the annular groove but rather takes the oil directly into the drilling in the crank pin.</span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">I have also cut an inspection/cleaning hole in the top of several ‘B’ or ‘C’ oil tanks. Only one was clean inside. The rest had up to half an inch of the filthiest gunge in their bases which takes a lot of cleaning out. I cannot recommend too highly the cleaning out of these upper frame members for anyone trying to do a thorough job.</span></span></p></blockquote><p></p>
[QUOTE="timetraveller, post: 23027, member: 456"] [SIZE=3][FONT=Calibri]Over the years I have probably taken apart more than 20 Vincent flywheel assemblies for various reasons, sometimes when the big ends had failed. This is much less than the professionals in the Club but more than most. In almost every case where this crank pin had the annular groove for the oil feed as in the original Vincent big ends and the early Alphas this groove was full with a hard packed mixture of carbon and aluminium debris. This had centrifuged out of the oil and was packed so hard that eventually it cuts the flow of oil to the big end which results in failure. All these engines had the standard Vincent felt filter in them but how often it and the oil had been changed is generally unknown. A magnet is not going to collect either the hard carbon or aluminium. Clearly the standard Vincent filter is inadequate and suggestions to leave out any filter strike me as either unfortunate or incompetent. The modern paper filters should be better although I have no personal experience of them. The fitting of a modern free flow filter in the return line must also be a good thing. A way round this ‘centrifugal filter’ is to fit an oversize crank pin which does not have the annular groove but rather takes the oil directly into the drilling in the crank pin.[/FONT][/SIZE] [SIZE=3][FONT=Calibri]I have also cut an inspection/cleaning hole in the top of several ‘B’ or ‘C’ oil tanks. Only one was clean inside. The rest had up to half an inch of the filthiest gunge in their bases which takes a lot of cleaning out. I cannot recommend too highly the cleaning out of these upper frame members for anyone trying to do a thorough job.[/FONT][/SIZE] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Draining Oil
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