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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Front Wheel Bearings
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<blockquote data-quote="brian gains" data-source="post: 97760" data-attributes="member: 3153"><p>The Comet is a '51, no idea of exact date from a works order.</p><p>The setup described by Marcus sounds similar to what I have found.</p><p></p><p>Both bearings are sealed and of different manufacture, The ball bearing ( SKF ) but I could not identify the JAL sealed bearing which must be the plain roller and would have been the same as ET94 according to Stevens.</p><p></p><p>From the description it sounds as if the ET94 was 'floating' and held in position by thrust washers which would mean axial loads, in at least one direction, taken by the centre race as the outer race would be seated and able to transfer loads on one side where it abutted the screwed down retaining collar. Does that sound right?</p><p></p><p>As for machining, that sounds like a hell of a job and one for someone with specific Vincent build knowledge apart from a complete wheel rebuild, also would something need to be done about the gear drive to the speedometer.</p><p></p><p>Think I'll stick with PCV's bodge that seems not at all mechanically well founded and I guess results in faster bearing deterioration. Sounds to me like a p*ss poor set up to get around the lack of availability of adjustable cone bearings.</p></blockquote><p></p>
[QUOTE="brian gains, post: 97760, member: 3153"] The Comet is a '51, no idea of exact date from a works order. The setup described by Marcus sounds similar to what I have found. Both bearings are sealed and of different manufacture, The ball bearing ( SKF ) but I could not identify the JAL sealed bearing which must be the plain roller and would have been the same as ET94 according to Stevens. From the description it sounds as if the ET94 was 'floating' and held in position by thrust washers which would mean axial loads, in at least one direction, taken by the centre race as the outer race would be seated and able to transfer loads on one side where it abutted the screwed down retaining collar. Does that sound right? As for machining, that sounds like a hell of a job and one for someone with specific Vincent build knowledge apart from a complete wheel rebuild, also would something need to be done about the gear drive to the speedometer. Think I'll stick with PCV's bodge that seems not at all mechanically well founded and I guess results in faster bearing deterioration. Sounds to me like a p*ss poor set up to get around the lack of availability of adjustable cone bearings. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Front Wheel Bearings
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