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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust Washers
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<blockquote data-quote="oexing" data-source="post: 177091" data-attributes="member: 1493"><p>When you got a lightly stripped ex thread - how so, what´s left then - I could imagine that sort of tap you get for a decent spark plug helicoiling, see link below. This tap got the first part with 14x1.25mm original plug thread for finding into the old windings. And then it will cut the new helicoil tread with correct alignment from the old windings. Otherwise I would not believe the job on the Vincent ex thread could find an acceptable outcome. Big snag is you don´t have a through hole for the stepped tap so you´d need another tap for bottoming the short thread - not a cheap operation. At least no CNC required and once a company was found for producing these special taps , instead of helicoiling (at that diameter I´d have no faith) the Spares Co may provide standardized oversize ex nuts ?? </p><p> Well, welding on cylinder heads is standard repair - on BMW heads with their alu nuts on alu heads . Cylinder heads are meant to accept 200-250 degrees C or a bit more in the heat of 100 percent power like in owners manuals of aero engines, so as to prevent them from turning soft or cracking. I don´t know much about Vincent aluminium found in cylinder heads , so no clue about heat treatments after welding but believe a lot of welding was done in past decades on Vincents without much troubles from this, so I am positive . . . .</p><p></p><p> Vic</p><p><a href="https://www.ebay.de/itm/254090827351?hash=item3b28fe5657:g:HRQAAMXQoiJRgvYc&amdata=enc%3AAQAIAAAA8Mo6KGXQj6vWaLoN8m4UFVWCMxNTiuVyApylV7JjrVKSpC10DR4ApleuyVGAn%2F2AwBGUj3ypWYdvV6q1kiZVJhnVbbsYVj1iKckr4vCqESlAxma%2BvH4HbifeqqzXyoz6BvptpiZxP9K2LtuEITeF1u5%2B5%2Ba3POp%2Fb2wqe%2BO2ZYGZc6Dh86BGui1LCKJqxdix12yt%2B0uU6GgsLPUdErv9nsOSWPyGQnKyUqbp1u031y1KkqKpVhZBRIgGgK8qjGr7L3Th7rXtyTpixBpoL8BaulT%2FgYejKA56v0OI%2FnjbCgrXLXAAuKYCt%2FDtF%2FCo5cQnEA%3D%3D%7Ctkp%3ABFBMlo6DyP9i" target="_blank">repair tap</a></p></blockquote><p></p>
[QUOTE="oexing, post: 177091, member: 1493"] When you got a lightly stripped ex thread - how so, what´s left then - I could imagine that sort of tap you get for a decent spark plug helicoiling, see link below. This tap got the first part with 14x1.25mm original plug thread for finding into the old windings. And then it will cut the new helicoil tread with correct alignment from the old windings. Otherwise I would not believe the job on the Vincent ex thread could find an acceptable outcome. Big snag is you don´t have a through hole for the stepped tap so you´d need another tap for bottoming the short thread - not a cheap operation. At least no CNC required and once a company was found for producing these special taps , instead of helicoiling (at that diameter I´d have no faith) the Spares Co may provide standardized oversize ex nuts ?? Well, welding on cylinder heads is standard repair - on BMW heads with their alu nuts on alu heads . Cylinder heads are meant to accept 200-250 degrees C or a bit more in the heat of 100 percent power like in owners manuals of aero engines, so as to prevent them from turning soft or cracking. I don´t know much about Vincent aluminium found in cylinder heads , so no clue about heat treatments after welding but believe a lot of welding was done in past decades on Vincents without much troubles from this, so I am positive . . . . Vic [URL='https://www.ebay.de/itm/254090827351?hash=item3b28fe5657:g:HRQAAMXQoiJRgvYc&amdata=enc%3AAQAIAAAA8Mo6KGXQj6vWaLoN8m4UFVWCMxNTiuVyApylV7JjrVKSpC10DR4ApleuyVGAn%2F2AwBGUj3ypWYdvV6q1kiZVJhnVbbsYVj1iKckr4vCqESlAxma%2BvH4HbifeqqzXyoz6BvptpiZxP9K2LtuEITeF1u5%2B5%2Ba3POp%2Fb2wqe%2BO2ZYGZc6Dh86BGui1LCKJqxdix12yt%2B0uU6GgsLPUdErv9nsOSWPyGQnKyUqbp1u031y1KkqKpVhZBRIgGgK8qjGr7L3Th7rXtyTpixBpoL8BaulT%2FgYejKA56v0OI%2FnjbCgrXLXAAuKYCt%2FDtF%2FCo5cQnEA%3D%3D%7Ctkp%3ABFBMlo6DyP9i']repair tap[/URL] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust Washers
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