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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Stripped oil pump
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<blockquote data-quote="John Appleton" data-source="post: 13641" data-attributes="member: 760"><p>Howard, the NUMBER of teeth is the same on a new and old worm. The effective pitch is NOT the same. What John will be seeing on the old worm is teeth much further apart , because they are thinner. Try to mesh this worm with a new plunger and you will get the "tooth on tooth" that I mentioned earlier. The fact that it is a reciprocating plunger is irrelevant and can be ignored. I hope this much simplified explanation clarifies my earlier post, but if not , keep the questions coming.</p><p> The other thing to bear in mind is, the damage visible on Johns new plunger is Not caused by wear , but by the new teeth being rolled out of the way of the worm. Obviously this rolling will all happen within very few revs, and is what I was referring to when I said the metal had been moved and not worn.</p><p>John</p></blockquote><p></p>
[QUOTE="John Appleton, post: 13641, member: 760"] Howard, the NUMBER of teeth is the same on a new and old worm. The effective pitch is NOT the same. What John will be seeing on the old worm is teeth much further apart , because they are thinner. Try to mesh this worm with a new plunger and you will get the "tooth on tooth" that I mentioned earlier. The fact that it is a reciprocating plunger is irrelevant and can be ignored. I hope this much simplified explanation clarifies my earlier post, but if not , keep the questions coming. The other thing to bear in mind is, the damage visible on Johns new plunger is Not caused by wear , but by the new teeth being rolled out of the way of the worm. Obviously this rolling will all happen within very few revs, and is what I was referring to when I said the metal had been moved and not worn. John [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Stripped oil pump
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