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Norton Crank Repair, (or how to stop a grown man crying)

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Bogstandard:
I get jobs like that Ned.

http://madmodder.net/index.php?topic=1717.0

But in the end, he was crying.


Bogs

MrFluffy:
How much better the world would be if everyone knew that heating up the mating part to a dull red and then allowing the part to cool kills the loctite bond so things can just be turned or undone normally. Loctite should write on the back "Bond can be broken with heat cycling" or something similar. Of course it may have killed the bearings if they were 2rs spec, but better that than the crank thread. But Im preaching to the knowledgeable here already.
 
Nice save on the crank nut. Sometimes its nice to fix something nice just for the experience, and manx's are very nice indeed.

Ned Ludd:
Hi Guys,
Thanks for suggestions I will look into it.

I think I will come to the defence of the hammer merchant, well partly at least. He did use heat in the end, he put the crankcase in his kitchen oven for a few hours, but the reason he did not try it in the first place was because he was worried about setting alight to the cases. Some of you my know that pre-war Manx cases are not made from Aluminium but from Magnesium, and he thought they might immolate. Using a gas torch would not have worked either as the bearings are held the cases by plates held with 4 screws. So the oven and a long heat soak was the only way to get enough heat to the shaft where it met the bearing without risking over heating it. I would judge that he is, under normal circumstances, a fairly competent spanner monkey but everybody has an off day and his was a "peach". As someone, perhaps it was Bogs or someone replying to one of his posts, "if it can be repaired it wasn't broken in the first place". Let that be a guide to you all in your life of machining.

This is a special reply to Bogs, I have read your Bantam repair write up several times since you first posted it, I really do like your style, we think very much alike on such matters, but I bow to your greater experience. You and I seem to think that knowledge should be passed on to beginners and you use working examples in an exemplary way to highlight techniques, as opposed to the majority of books which leave quite a lot to be desired in these matters. I only posted the repair, following your lead, to the crank to show that all is not lost when such things happen.
Ned

Bogstandard:
Ned,

Too much is given up for dead nowadays, when all it takes is a bit of thinking about and knowledge, and most mechanical things can be rescued.

I don't even try with wiggly amps and electric string, unless it is a screwdriver job.


Bogs

croz:
Hi,
I am a "newbie" here!
Just to say nice work on the manx crank and that a couple of years ago i had to do similar to a couple of T140 Bonnie cranks, one was hammered not only on the drive side like the manx, but also the timing side ground oil feed nose too!!
Nice forum BTW
Croz

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