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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
help to determine authenticity and value of 1017 cases
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<blockquote data-quote="A_HRD" data-source="post: 36217" data-attributes="member: 49"><p>Eddie,</p><p></p><p>I would say with complete confidence that the engine number is correct and unmolested. The crankcases appear to be in good condition, do they come with the original covers? </p><p></p><p>The weld repair around the primary case sprocket looks to be well done; it presumably came about after a primary-chain breakage whereupon the chains wraps around the engine sprocket and forces the cases outwards (don't ask me how I know (twice!)). Put a straight edge across the chaincase joint in various positions to confirm alignment and an adequate seal. There is a possible lingering problem though. The welding may have distorted the alignment of the main-bearing housing on the drive-side. This can only be determined via some very careful measuring - often needing specialist equipment. But before you do this, you could fit all new C3 main-bearings (heat cases to 200C first) and have a dummy shaft ground to size minus about 0.001". You should be able to slide this through the bearings, with oil, without undue force... by hand. And the shaft should turn by hand without tight spots. If not you may need to have the bearing housings professionally line-bored and re-sleeved. There are Vincent specialists in the UK who do this. It is well worth doing and gives the bottom-end a new lease of life for several decades. </p><p></p><p>Even though you are about to do it the hard way in getting yourself a Vincent, I wish you every success. </p><p></p><p>Peter B</p><p>Bristol, UK.</p></blockquote><p></p>
[QUOTE="A_HRD, post: 36217, member: 49"] Eddie, I would say with complete confidence that the engine number is correct and unmolested. The crankcases appear to be in good condition, do they come with the original covers? The weld repair around the primary case sprocket looks to be well done; it presumably came about after a primary-chain breakage whereupon the chains wraps around the engine sprocket and forces the cases outwards (don't ask me how I know (twice!)). Put a straight edge across the chaincase joint in various positions to confirm alignment and an adequate seal. There is a possible lingering problem though. The welding may have distorted the alignment of the main-bearing housing on the drive-side. This can only be determined via some very careful measuring - often needing specialist equipment. But before you do this, you could fit all new C3 main-bearings (heat cases to 200C first) and have a dummy shaft ground to size minus about 0.001". You should be able to slide this through the bearings, with oil, without undue force... by hand. And the shaft should turn by hand without tight spots. If not you may need to have the bearing housings professionally line-bored and re-sleeved. There are Vincent specialists in the UK who do this. It is well worth doing and gives the bottom-end a new lease of life for several decades. Even though you are about to do it the hard way in getting yourself a Vincent, I wish you every success. Peter B Bristol, UK. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
help to determine authenticity and value of 1017 cases
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