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Old 03-16-2008, 04:47 PM   #1 (permalink)
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Default welding leaking hinge, seal tank or wait.

I have the usual leaking hinge and am going to have a friend braze it for me. I also have a dent in the usual spot from when my GF wanted to learn how to ride it last year and drove it into the neighbors lawn. I am going to get the dent repaired at a later date. If I braze the tank now and repair the dent sometime in the summer, do I need to do the Por 15 now or can it wait? I`m assuming when they repair the dent they will have to put a hole in it to pull it out. Therefore it would need to be coated again. Also do I need to remove th fuel pump and interior pieces for welding will it get too hot for them? Should I just use some JB weld and hope it holds up for a few months and do everything at once?
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Old 03-16-2008, 06:18 PM   #2 (permalink)
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Default Re: welding leaking hinge, seal tank or wait.

I would send it to ducpainter he will do the whole bit for you for a very fair price.
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Old 03-16-2008, 08:04 PM   #3 (permalink)
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Default Re: welding leaking hinge, seal tank or wait.

I was going to have my hinge brazed as preventative maintenance, but I forgot to do it before I had a raditator seal the tank. I asked the shop if I could still braze the hinge, and they said the heat would mess up the coating. I'm not sure what brand coating they used, though.
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Old 03-16-2008, 08:55 PM   #4 (permalink)
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Default Re: welding leaking hinge, seal tank or wait.

I wouldn't count on the brazing to seal the leak.

The brazing reinforces a poor design.

The POR does the sealing.

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Old 03-17-2008, 12:38 AM   #5 (permalink)
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Default Re: welding leaking hinge, seal tank or wait.

From the posts I've seen, brazing seems to be the preferred method of fixing the leaks. Just wondering why brazing instead of welding? I remember trying to braze a cracked chain guard on my old Triumph and the crack just kept trying to grow. And once it's been brazed I don't think you can ever go back and weld it.
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Old 03-17-2008, 09:34 AM   #6 (permalink)
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Default Re: welding leaking hinge, seal tank or wait.

Quote:
Originally Posted by Langanobob
From the posts I've seen, brazing seems to be the preferred method of fixing the leaks. Just wondering why brazing instead of welding? I remember trying to braze a cracked chain guard on my old Triumph and the crack just kept trying to grow. And once it's been brazed I don't think you can ever go back and weld it.
I braze for a couple of reasons.

The important one is that Ducati at different times in the production of the tanks has used a brass stitch or two to hold the hinge plate in place for spot welding. By brazing that brass doesn't have to be cleaned out before using a welding process.

Also the brass is used as a reinforcement for a bad design and is really all that is necessary to keep the plate from further stressing the spot welds. The cracks that develop on the tank bottom do not extend beyond the hinge plate, and as I said I don't use the brass to eliminate the leak, although it sometimes does.
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Old 03-17-2008, 02:59 PM   #7 (permalink)
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Default Re: welding leaking hinge, seal tank or wait.

Quote:
I braze for a couple of reasons.
OK - now I understand. Thanks.
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Old 03-17-2008, 06:37 PM   #8 (permalink)
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Default Re: welding leaking hinge, seal tank or wait.

Still need to know does the fuel pump assembly have to be removed before brazing? Does the inside need to be sealed right away if i am going to get a dent pulled out and repainted in a few months?
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Old 03-17-2008, 08:38 PM   #9 (permalink)
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Default Re: welding leaking hinge, seal tank or wait.

Quote:
Originally Posted by mookieo2
Still need to know does the fuel pump assembly have to be removed before brazing? Does the inside need to be sealed right away if i am going to get a dent pulled out and repainted in a few months?
The fuel pump needs to be removed or you will melt the pick up screen.

You can always braze it and if it doesn't leak you can use it. I don't do it that way.

The area affected by the heat will rust very quickly.
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Old 11-16-2009, 04:43 PM   #10 (permalink)
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Default

Hey Ducpainter,
Tried PMing you about some tank work, but the box is full. Drop a PM if you get wind of this msg.

-jb
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