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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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<blockquote data-quote="timetraveller" data-source="post: 133524" data-attributes="member: 456"><p>I think that that somehow things have got confused. Considering only the clutch side of the gear box. My suggestion about the 'o' ring, inside and at the inside end of the C3 shaft is intended to stop oil getting inside that tube and passing through the C3 around the gearbox main shaft. If there is any doubt about what I am referring to it is where the early Vincent recommendation was sealing compound and later a modified C3 and modified C20 together with an 'o' ring. Oil passing along the main shaft by this route will emerge inside the clutch drum and cause slipping. Any oil passing through the inside of the clutch sprocket will emerge behind the clutch drum and will get flung outwards and unlikely to get onto the linings. Lubricating the bushes and seal inside the sprocket probably requires that a small amount of oil gets in there.</p><p>A small section 'o' ring at the output side of the gear box only requires the bush to be tapped in about a mm so I did not machine the bush itself. I will find out eventually whether that was a mistake or not, The 'o' ring mod at the clutch side of the gear box has worked without problems for, probably, 55 years.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 133524, member: 456"] I think that that somehow things have got confused. Considering only the clutch side of the gear box. My suggestion about the 'o' ring, inside and at the inside end of the C3 shaft is intended to stop oil getting inside that tube and passing through the C3 around the gearbox main shaft. If there is any doubt about what I am referring to it is where the early Vincent recommendation was sealing compound and later a modified C3 and modified C20 together with an 'o' ring. Oil passing along the main shaft by this route will emerge inside the clutch drum and cause slipping. Any oil passing through the inside of the clutch sprocket will emerge behind the clutch drum and will get flung outwards and unlikely to get onto the linings. Lubricating the bushes and seal inside the sprocket probably requires that a small amount of oil gets in there. A small section 'o' ring at the output side of the gear box only requires the bush to be tapped in about a mm so I did not machine the bush itself. I will find out eventually whether that was a mistake or not, The 'o' ring mod at the clutch side of the gear box has worked without problems for, probably, 55 years. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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