G: Gearbox (Twin) Inspection cap thread repair...

oexing

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VOC Member
All welding procedures are fine and great but can be a frustrating operation with oily cast aluminium. But big question: Where do you get the thread at last, who will machine this ? This particular thread is not loaded much, just holds the cap - and that can be secured with a thin o-ring to stay safe. So my idea is to find a metal repair putty and glue the cap or better an exhaust nut with putty into the tidied up hole. You get the thread modelled from the nut into the cured putty in the same time. Of course you have to prepare the thread with some wax or release agent and a little heat may help for first time unscrewing. I think this could be a very economic way for a minimally loaded joint, welding can be done anyway later in case the result of putty use proved unsatisfying.

Vic
Link to putty: Putty
 

Bill Thomas

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Did you not see the video Vic ?,The alloy weld won't stick to the bolt and the threads are made by the shape of the bolt, I saw it at a bike show , And had to have some.
A friend of mine , Dave Jones from North London, Blew his Twin outfit up while racing at Silverstone, He was last seen picking up all the broken bits of casing at the track side !, I wonder if that could make it better again ??. Cheers Bill.
 

oexing

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VOC Member
Yeah, that was a steel bolt, wouldn´t want to try that with an alu or brass item. Anyway, you are very close to the melting point of the alu casting, oil a problem at all times. The putty costs next to nothing and could be done in situ. Once I sealed a broken fuel hose on an E-Type at a stop during a rallye , great solution for street repairs so I kept that in the tool box anyway.

Vic
 

Bill Thomas

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VOC Member
I am the same, Keep all sorts of stuff just in case, Some of the aluweld, Work at a lower temp'.
Cheers Bill
 

erik

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VOC Member
@Vic.may be ptfe spray is a good insulation and easy to bring it on the surface.with wax this can be a bigger problem.regards erik
 
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