1967 Primary cover dent - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 22 (permalink) Old 08-30-2019, 09:25 PM Thread Starter
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1967 Primary cover dent

I would like to know if I would be able to heat up enough to soften the aluminum on this 1967 primary cover to push a dent caused by the footpeg without cracking or doing damage to the cover.your reply`s will be appreciated.
Juan

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post #2 of 22 (permalink) Old 08-30-2019, 09:32 PM
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Yes, but it's a case of suck it see. I have done it using a hot air gun and a hide mallet and it worked well.

Rod
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post #3 of 22 (permalink) Old 08-30-2019, 09:32 PM
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I once tried to fix an aluminum bicycle kickstand with a torch.
It ended up as a blackened blob.


If I were compelled to save that particular cover I might seek out an aircraft welder. I had the bottom lug of an aluminum fork repaired by one such miracle worker.


That being said, your cover isn't particularly pretty and they can be found pretty cheap (currently) on the EBAY..
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post #4 of 22 (permalink) Old 08-30-2019, 09:50 PM Thread Starter
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Thanks for the reply guys. I have a heat gun and will give it a try. This is the primary cover for my TR6R and I thought I would ask before trying. On my T140V I tried using some welding rods by Eastwood and I ended with a repair that didn`t match the aluminum on the primary case and ended up buying a good used one that I polished. I have seen new ones on the bay is just that I want to play with this one. Thanks again.
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post #5 of 22 (permalink) Old 08-31-2019, 01:56 AM
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Work slowly, heating the metal between blows with the other side supported on a rubber block or piece of wood. Metal responds to patience.

Rod
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post #6 of 22 (permalink) Old 08-31-2019, 07:11 AM
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Hi Juan,

Quote:
Originally Posted by Redmoggy View Post
Work slowly, heating the metal between blows with the other side supported on a rubber block or piece of wood. Metal responds to patience.
Fwiw, I once saw someone remove a similar dent with the cover supported on a sandbag?

Or another pov is this is an old bike and the dent is one of its scars?

Regards,
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post #7 of 22 (permalink) Old 08-31-2019, 08:41 AM
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use some soap from a bar as a temperature guide - rub some over the area you are going to heat -- when it goes black you are at a temperature that the ali will readily move - but at that point dont add more heat -- having said that ; a heat gun is unlikely to easily reach that sort of temperature
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post #8 of 22 (permalink) Old 08-31-2019, 09:26 AM
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Donít use any grit coarser than 100 when refinishing that case, progressively move to smaller grit. A vibratory sander can work wonders on that . Keep it moving and uniform so you donít dig in or change a contour. I think you can get most of that damage out.
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post #9 of 22 (permalink) Old 08-31-2019, 03:09 PM
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Stuart, an old fashioned panel beaters leather sand / shot bag would be ideal. I try and think of the most likely things someone would have hanging around.

On a similar vane, you could try and knock that dent out cold but you risk cracking the case. You could use an oxy acetylene set or big blow torch to heat it and probably knock it out in one go but this assumes the user has this equipment and is experienced enough to control the amount of heat and not melt or distort the case.

On the other hand most people have a heat gun in the shed and whilst it will take some patience the risk of a catastrophic cock up is significantly reduced. I've also removed the same dent from my own primary using this method.

Rod
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post #10 of 22 (permalink) Old 08-31-2019, 10:19 PM
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Quote:
Originally Posted by StuartMac View Post

Or another pov is this is an old bike and the dent is one of its scars?
you know, i'm beginning to look at the old machines with more of this point of view as well.

these things are old, finally, and becoming rare. their miscellaneous beat-up parts are becoming less of a aesthetic hindrance and more of their history.

i have some stuff that's pretty pristine, but the cosmetic beaters are the ones that are getting my attention.

if it isn't a functional flaw, i'm tending to ignore them these days and leave the point-restorations for younger people with less-seasoned views of permanence.
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