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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big end journal alignment
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<blockquote data-quote="Matty" data-source="post: 22300" data-attributes="member: 1339"><p>Thanks again - on a twin there are of course 4 oil holes in the crank journal, two for each big end which are 180 degrees spaced. So in fact there is one oil hole at say 3 oclock and one at 9 oclock for each big end, if I position the journal as suggested. For a roller bearing I still can not see why it makes much difference where the holes are, as long as there is a good supply of oil to the bearing - after all a two stroke has no pressurised oil system and relies on the very small (50:1) amount of oil mixed with the petrol for roller bearing lubrication and these seem to be pretty reliable !!</p><p> </p><p>On my Comet there is only one oil hole (I have old journals) but I do not know where it has been positioned because I did not assemble the flywheels, not having a lathe any more - I think at 12 o clock when I changed it in 2009 for one I bought from VOC spares.</p><p> </p><p>When I last rebuilt the crank myself in 1957 (with Alpha Bearings) I did not know about any of this and just pressed it all back together. The bike has been used continuously since then on 20/50 oil with no problems -up to 2009 and even then it was not in a very bad state.</p><p> </p><p>Thanks again.</p><p> </p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 22300, member: 1339"] Thanks again - on a twin there are of course 4 oil holes in the crank journal, two for each big end which are 180 degrees spaced. So in fact there is one oil hole at say 3 oclock and one at 9 oclock for each big end, if I position the journal as suggested. For a roller bearing I still can not see why it makes much difference where the holes are, as long as there is a good supply of oil to the bearing - after all a two stroke has no pressurised oil system and relies on the very small (50:1) amount of oil mixed with the petrol for roller bearing lubrication and these seem to be pretty reliable !! On my Comet there is only one oil hole (I have old journals) but I do not know where it has been positioned because I did not assemble the flywheels, not having a lathe any more - I think at 12 o clock when I changed it in 2009 for one I bought from VOC spares. When I last rebuilt the crank myself in 1957 (with Alpha Bearings) I did not know about any of this and just pressed it all back together. The bike has been used continuously since then on 20/50 oil with no problems -up to 2009 and even then it was not in a very bad state. Thanks again. Matty [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big end journal alignment
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