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Removing gas tank dents.

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Removing gas tank dents.

PostAuthor: Yamahas rock » Mon Nov 11, 2019 12:59 pm

Hi everyone,

My 920 has some awful dents in the tank and I was wondering if I could drain the gas out of it, brim it with water and leave it out in the 15 degree weather here in Illinois to push out the tents. Has anyone done this? If so, what should I leave open (fuel cap and uhh that's really all I could leave open.)
Last edited by Jake on Mon Nov 11, 2019 2:44 pm, edited 1 time in total.
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Re: Removing gas tank dents.

PostAuthor: Arjay » Mon Nov 11, 2019 4:44 pm

from Google.

When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands by approximately 9%.

I wonder if you set portions you didnt want effected in concrete mold, to prevent expansion. Honestly this all sounds like a disaster.

The lesser dents can be removed with hair dryer and ice. They pop back. Dents that have hard bends wont work for it.

Compressed air comes to mind. More controlled than ice.

Pictures..?

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Re: Removing gas tank dents.

PostAuthor: rchawaii » Mon Nov 11, 2019 10:42 pm

My Ride is a 1983 XV 500 :usa:
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Re: Removing gas tank dents.

PostAuthor: rchawaii » Mon Nov 11, 2019 10:44 pm

Please for the love of God ignore the part about welding using an electrical cord. :db:
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Re: Removing gas tank dents.

PostAuthor: Flyingdog » Tue Nov 12, 2019 2:40 pm

You're probly going to repaint...If it doesn't look like a golf ball... I've just used body filler and sanded to shape. But use filler with fiberglass..then prep for paint, as usual.

Or, depending how the denting is, grab a ball peen (maybe some body dollies) and have at it. Make it truely unique.
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Re: Removing gas tank dents.

PostAuthor: Hellgate » Tue Nov 12, 2019 2:49 pm

Dry ice can help. I think you'll damage the tank is you froze the water inside. I think the seems would split.

https://www.continentalcarbonic.com/fix-car-dent.html
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Re: Removing gas tank dents.

PostAuthor: chrismalm » Tue Nov 12, 2019 4:22 pm

I'm heading into the dark and mysterious dent repair forest myself. I'll be following with interest to see who succeeds. If I get ambitious and try the heat gun / ice method, I'll report my results.
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Re: Removing gas tank dents.

PostAuthor: Hellgate » Tue Nov 12, 2019 4:44 pm

Hellgate wrote:Dry ice can help. I think you'll damage the tank if you froze the water inside of it. I think the seams would split.

https://www.continentalcarbonic.com/fix-car-dent.html
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Re: Removing gas tank dents.

PostAuthor: chrismalm » Thu Nov 14, 2019 10:19 am

Ok, dry ice.
I also saw a video using a small inner tube, like from a moving dolly/hand truck (remove the valve stem) some vinyl tube and compressed air to push out a dent. .
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Re: Removing gas tank dents.

PostAuthor: briandk » Fri Nov 15, 2019 5:49 pm

chrismalm wrote:Ok, dry ice.
I also saw a video using a small inner tube, like from a moving dolly/hand truck (remove the valve stem) some vinyl tube and compressed air to push out a dent. .


I tried with a blood pressure cuff. It fixed around half my dent but after that the cuffs just kept blowing. I think I’ll try the inner tube.

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Re: Removing gas tank dents.

PostAuthor: Arjay » Sat Nov 16, 2019 10:17 am

using tire tube and air video.
https://m.youtube.com/watch?v=PNtj-B3I6SA

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Re: Removing gas tank dents.

PostAuthor: Yamahas rock » Mon Nov 18, 2019 10:39 am

I just asked another buddy who owns a body shop and he said "That's the stupidest idea I've heard in a while. Who in the hell told you to do that because you will probably just break the tank welds. The best way to pull a golf ball dent is to use dent removal rods and a torch." So he is going to have me drain the tank and he will just pull the dents. I was actually able to pull one of the shallow dents out with a plunger. So for now I think I've fixed the issues.

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Re: Removing gas tank dents.

PostAuthor: Jake » Mon Nov 18, 2019 10:56 am

Yamahas rock wrote:I just asked another buddy who owns a body shop and he said "That's the stupidest idea I've heard in a while.


Which idea ??????
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Re: Removing gas tank dents.

PostAuthor: Yamahas rock » Mon Nov 18, 2019 11:09 am

Jake wrote:
Yamahas rock wrote:I just asked another buddy who owns a body shop and he said "That's the stupidest idea I've heard in a while.


Which idea ??????
The one where I fill the tank with water and put it outside overnight.

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Re: Removing gas tank dents.

PostAuthor: Arjay » Tue Nov 19, 2019 1:11 am

I often wonder why more people dont make fiberglass tanks. Strong, easy to repair and no rust.

Glue foam blocks together. Shape, sand etc. the foam. Fiberglass that. Cut in half, pull out foam and fiberglass back together. Add finishing coats, done.

I say this because many here do the custom thing and some suggest repair metal tank dents with fiberglass. I guess I worry about the reliability of bond being leak proof. So it might make more sense to go full fiberglass.

That and increase flex for designing

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Re: Removing gas tank dents.

PostAuthor: Flyingdog » Tue Nov 19, 2019 4:26 am

Arjay wrote:I often wonder why more people dont make fiberglass tanks.


Cuz fiberglass (in layman's terms) "Breaks"...metal dents.

Arjay wrote:Glue foam blocks together. Shape, sand etc. the foam. Fiberglass that. Cut in half, pull out foam and fiberglass back together. Add finishing coats, done.


Not quite.."Lost Foam" method is how that's done.

Arjay wrote:some suggest repair metal tank dents with fiberglass.


Where you ever hear that? YouTube? :;: As add "to" a "filler"..yes. But, by itself to repair splits/holes that has to contain fuel..never. You ever happen to "go down" with a fiberglass tank..you'd probly go "up in flames".

Arjay wrote:increase flex for designing


Fiberglass "Does Not" flex. And...the resins used with fiberglass deteriorates over time...and worse..will "Melt". Unless you know whatch doing.
That's why plastic high-density polyethylene was invented. Been around forever. Used for enduro/trail bikes and the like.
Years ago, gas tanks for boats were made outta fiberglass. Until, one day the light bulb went on..cuz the tanks were melting...call: Styrene.
Seen some even try carbon fiber/kevlar.. that's even funnier..unless it's for show. But for practicality? Not hardly.

But I digress..none of this has a thing to do with YamahasRocks' repair. I agree with your decision to "pull" the dents with the stud welder (dent removal rods as you called it). Only draw back, you'd still have to grind/fill/skim/paint the final surface. Just the price of repairs... :bg: Only true method,though..imho.
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Re: Removing gas tank dents.

PostAuthor: Hellgate » Tue Nov 19, 2019 6:01 am

More dent repair. His guy is very, very good. And fiberglass is a terrible idea for most things, especially a fuel tank.

https://youtu.be/-Y-WedpjlB0
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