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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Stripped oil pump
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<blockquote data-quote="timetraveller" data-source="post: 13582" data-attributes="member: 456"><p>Things to check and which are often not mentioned in the world of Vincents as we like to think that people who make parts actually know what they are doing. Are you sure that both the worm and the plunger are single start? The worm is self explanatory in that if you look at either end you will see that the thread only has one start. Was the plunger single start? If it is then the teeth should be parallel with the axis of the plunger. Several years ago one spares producer made a whole bunch of supposedly double start plungers with the teeth parallel to the axis. For a double start they should be angled relative to the axis of the plunger. Was the run out of the teeth on the plunger shallow? The reason for this question is that a batch were made where a cutter with too large a diameter was used which resulted in the end of the teeth where they get shallower and run up into the outer diameter of the plunger having too shallow a gradient. This meant that as the plunger moved up-wards the clearance between the worm and the teeth reduced until it became an interference fit and everything wore out very quickly. All these faults resulted in pumps which wore out in hundreds of miles, not minutes, so they are unlikely to be the source of your troubles but worth checking before you put it back together. There should be very little clearance between the plunger and sleeve so it should not be necessary to wear the components out by too much lapping in before using. Too much clearance here is why so many Vincents sump now when they didn't 50+ years ago. Can you remove the worm without dismantling the engine? If so, then when reassembling everything and after you have put in the locating screw which fits into the scroll in the plunger and which makes is reciprocate, rotate the plunger by using a long bolt or stud and without the worm in place. It should rotate easily. Is the plunger hard, i.e. hard as opposed to soft metal. For it to wear out in minutes suggests that either it was locked solid or is made of putty.</p><p> </p><p>Good luck.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 13582, member: 456"] Things to check and which are often not mentioned in the world of Vincents as we like to think that people who make parts actually know what they are doing. Are you sure that both the worm and the plunger are single start? The worm is self explanatory in that if you look at either end you will see that the thread only has one start. Was the plunger single start? If it is then the teeth should be parallel with the axis of the plunger. Several years ago one spares producer made a whole bunch of supposedly double start plungers with the teeth parallel to the axis. For a double start they should be angled relative to the axis of the plunger. Was the run out of the teeth on the plunger shallow? The reason for this question is that a batch were made where a cutter with too large a diameter was used which resulted in the end of the teeth where they get shallower and run up into the outer diameter of the plunger having too shallow a gradient. This meant that as the plunger moved up-wards the clearance between the worm and the teeth reduced until it became an interference fit and everything wore out very quickly. All these faults resulted in pumps which wore out in hundreds of miles, not minutes, so they are unlikely to be the source of your troubles but worth checking before you put it back together. There should be very little clearance between the plunger and sleeve so it should not be necessary to wear the components out by too much lapping in before using. Too much clearance here is why so many Vincents sump now when they didn't 50+ years ago. Can you remove the worm without dismantling the engine? If so, then when reassembling everything and after you have put in the locating screw which fits into the scroll in the plunger and which makes is reciprocate, rotate the plunger by using a long bolt or stud and without the worm in place. It should rotate easily. Is the plunger hard, i.e. hard as opposed to soft metal. For it to wear out in minutes suggests that either it was locked solid or is made of putty. Good luck. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Stripped oil pump
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