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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Do Series A singles have sumping problems?
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<blockquote data-quote="A_HRD" data-source="post: 52391" data-attributes="member: 49"><p>Yes, lots of people use the Conways valve on their Series A. Properly primed it seems to work well. There is one on Nigel - The Club Series A Comet. But I currently have the oil-pump off it at the moment to investigate a reported 'failure to return oil' problem; it fills the sump instead. A slightly different scenario to the one highlighted by b'knighted above, I agree. </p><p></p><p>Coincidently, I also have my own 'A' oil-pump on the bench at the moment and 2 thoroughly worn-out ones belonging to a mate. All exhibit much the same problems to varying degrees - worn gears, worn shafts, worn OP10 intermediate plate and far too much end float on the gears. Nigel has 10-12 thou rather than the recommended 2 thou end-float. They are pretty simple devices and if the late Bob Stafford's writings are carefully followed, the engine shouldn't 'sump' at all - or at least not excessively. </p><p></p><p><a href="http://www.voc.uk.com/net/docs/4.1/4.1-382-48.pdf" target="_blank">http://www.voc.uk.com/net/docs/4.1/4.1-382-48.pdf</a> (or find it in MPH 382)</p><p></p><p>The only bit where I deviate from Bob's practice is to flatten-down the mating faces of the pump until there is ZERO end-float (or even a thou or two of gear standing proud) and then insert a very thin (~about 3 thou) gasket between face and steel plate - the gasket made from a brown coloured "baking paper" available in the UK. A little Wellseal keeps it all oil-tight. </p><p></p><p>Peter B</p><p>Bristol, UK.</p><p><span style="color: #ff0000">WANTED: Series 'A' Front Frame.</span></p></blockquote><p></p>
[QUOTE="A_HRD, post: 52391, member: 49"] Yes, lots of people use the Conways valve on their Series A. Properly primed it seems to work well. There is one on Nigel - The Club Series A Comet. But I currently have the oil-pump off it at the moment to investigate a reported 'failure to return oil' problem; it fills the sump instead. A slightly different scenario to the one highlighted by b'knighted above, I agree. Coincidently, I also have my own 'A' oil-pump on the bench at the moment and 2 thoroughly worn-out ones belonging to a mate. All exhibit much the same problems to varying degrees - worn gears, worn shafts, worn OP10 intermediate plate and far too much end float on the gears. Nigel has 10-12 thou rather than the recommended 2 thou end-float. They are pretty simple devices and if the late Bob Stafford's writings are carefully followed, the engine shouldn't 'sump' at all - or at least not excessively. [url]http://www.voc.uk.com/net/docs/4.1/4.1-382-48.pdf[/url] (or find it in MPH 382) The only bit where I deviate from Bob's practice is to flatten-down the mating faces of the pump until there is ZERO end-float (or even a thou or two of gear standing proud) and then insert a very thin (~about 3 thou) gasket between face and steel plate - the gasket made from a brown coloured "baking paper" available in the UK. A little Wellseal keeps it all oil-tight. Peter B Bristol, UK. [COLOR=#ff0000]WANTED: Series 'A' Front Frame.[/COLOR] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Do Series A singles have sumping problems?
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