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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Vincent twin gearbox clearance set up
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<blockquote data-quote="greg brillus" data-source="post: 103755" data-attributes="member: 597"><p>The clearance is more about the two shafts G3 input and G4 output. This allows oil to get to the bushes within the G4 output shaft. If the clearance is minimal then this will limit oil and the bushes can seize, remembering that the oil level in the gearbox is not up at this level unless you over fill it. You could carry out a partial assembly without the gears except for the G6 gear pressed onto the G3 shaft. The G2 cover complete with bearing, lockring all in place. Then bump the cover home into its recess this with the G3 shaft installed through the bearing, and check for inward/outward movement of the shaft, then screw in a couple of the cover screws to pull the cover fully home and check again. It is possible to have almost nil clearance with no shim installed, this can require a small amount taken off the face of the G4 shaft, but this is usually if the crankcases have had their surfaces skimmed after weld repairs or similar. If the shaft moves more than say 20 thou, then add shims as required, you want at least 10 thou and no less..........There is no set guidelines as each engine /shaft combination is different. Be sure that the G2 cover is pulled up fully home when you check this even if you use more screws to pull the cover home. With the screws removed just give the Right hand end of the G3 shaft a nice tap with a soft face hammer to remove the cover/shaft from the crankcase mouth. It would pay to do one final check of this again with the complete gearset in place just to be sure. Good luck with it all.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 103755, member: 597"] The clearance is more about the two shafts G3 input and G4 output. This allows oil to get to the bushes within the G4 output shaft. If the clearance is minimal then this will limit oil and the bushes can seize, remembering that the oil level in the gearbox is not up at this level unless you over fill it. You could carry out a partial assembly without the gears except for the G6 gear pressed onto the G3 shaft. The G2 cover complete with bearing, lockring all in place. Then bump the cover home into its recess this with the G3 shaft installed through the bearing, and check for inward/outward movement of the shaft, then screw in a couple of the cover screws to pull the cover fully home and check again. It is possible to have almost nil clearance with no shim installed, this can require a small amount taken off the face of the G4 shaft, but this is usually if the crankcases have had their surfaces skimmed after weld repairs or similar. If the shaft moves more than say 20 thou, then add shims as required, you want at least 10 thou and no less..........There is no set guidelines as each engine /shaft combination is different. Be sure that the G2 cover is pulled up fully home when you check this even if you use more screws to pull the cover home. With the screws removed just give the Right hand end of the G3 shaft a nice tap with a soft face hammer to remove the cover/shaft from the crankcase mouth. It would pay to do one final check of this again with the complete gearset in place just to be sure. Good luck with it all. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Vincent twin gearbox clearance set up
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