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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Repairing crankcases and counter bore machining
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<blockquote data-quote="ksbundy" data-source="post: 35439" data-attributes="member: 714"><p>Hello, The crankcases can be easily repaired by a competent welder. I ran a vincent on speedway that had repaired cases (both halves) where a conrod had passed through the back into the gearbox, without problems, I also have another set that I have had the repair from when a primary chain let go. Firstly I made up a mandrel to fit into the bearing journals with the cases bolted up tight. After the welding check to see if they are still true. One set of cases it worked another it didn't and I need to line bore the tunnels and fit a sleeve. I have worked on Frank Sinclair's old lightning and the drive side mainbearing on it had been repaired this way. Just a comment, the welder said that the alloy was very good quality and easy to weld (compared to other old british bikes). </p><p>All the best</p><p>KS</p></blockquote><p></p>
[QUOTE="ksbundy, post: 35439, member: 714"] Hello, The crankcases can be easily repaired by a competent welder. I ran a vincent on speedway that had repaired cases (both halves) where a conrod had passed through the back into the gearbox, without problems, I also have another set that I have had the repair from when a primary chain let go. Firstly I made up a mandrel to fit into the bearing journals with the cases bolted up tight. After the welding check to see if they are still true. One set of cases it worked another it didn't and I need to line bore the tunnels and fit a sleeve. I have worked on Frank Sinclair's old lightning and the drive side mainbearing on it had been repaired this way. Just a comment, the welder said that the alloy was very good quality and easy to weld (compared to other old british bikes). All the best KS [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Repairing crankcases and counter bore machining
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