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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Vincent pilgrim pump in comparison
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<blockquote data-quote="Simon Dinsdale" data-source="post: 111302" data-attributes="member: 58"><p>Also the hole in question was only introduced in 1948 from engine number 375 onwards. Earlier engines had no hole at all and it was introduced to allow better lubrication of the oil pump worm to plunger area. As classicbiker explains it has nothing to do with the return pump operation and just directs oil running down the crankcase wall towards the worm on its way down to the sump.</p><p>I have just recently had to drill the hole in a 1947 engine whilst rebuilding it as advised in the Paul Richardson book.</p><p>Simon</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 111302, member: 58"] Also the hole in question was only introduced in 1948 from engine number 375 onwards. Earlier engines had no hole at all and it was introduced to allow better lubrication of the oil pump worm to plunger area. As classicbiker explains it has nothing to do with the return pump operation and just directs oil running down the crankcase wall towards the worm on its way down to the sump. I have just recently had to drill the hole in a 1947 engine whilst rebuilding it as advised in the Paul Richardson book. Simon [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Vincent pilgrim pump in comparison
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