Repairs & Maintenance

Subject
Topic: Fuel Tank Repair, Diesel
Majestic Dream
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Posted: 11 June 2006 at 7:34am | IP Logged

What is the procedure to cut an opening in a steel tank?  I need to expoxy the bottom to eliminate a leak. What tool would be recommended?

Thanks, Don

scuba1
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Posted: 11 June 2006 at 12:50pm | IP Logged
Is it in or out of the boat? I would reccommend having it professionally cleaned before doing any cutting on it, as we have had a few ignite when welding on them. They build up a varnish layer and trap fuel in the pockets.
Life`s short dive often!
sinelsen
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Posted: 11 June 2006 at 1:52pm | IP Logged
After I had my iron tank cleaned, then cleaned with MEK, I then am sealing a small leak in the lower weld with "microseal."  Microseal is made by microleak.com

I first tried epoxy, but the expansion and contraction of the tank opened it up again.  A longer time is needed before success can be claimed.
Majestic Dream
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Posted: 12 June 2006 at 7:04am | IP Logged
Thanks for you ideas!  The tank is not removable. That is why I need more than the one inspection port that is allready in the tank.  Need to get to the other side of the baffles. 
sinelsen
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Posted: 17 June 2006 at 1:11pm | IP Logged
Microseal stopped the leak in my Diesel tank.  Four weeks and no leak detected.  

sinelsen@alum.ups.edu
Majestic Dream
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Posted: 17 June 2006 at 2:59pm | IP Logged
Was your take aluminum?  Mine is steel!
sinelsen
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Posted: 17 June 2006 at 3:16pm | IP Logged
Mine is black iron.  About the same as steel as far as the sealer is concerned.  
Majestic Dream
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Posted: 18 June 2006 at 11:12am | IP Logged
Where did you buy Microseal ?
sinelsen
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Posted: 19 June 2006 at 1:48am | IP Logged
Microseal can be had from the internet at:

www.microleak.com 

It was about $50 a gallon and I only needed one!
Bay2260
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Posted: 19 June 2006 at 9:32am | IP Logged
Majestic,
There is a device available called a 'nibbler' which is used
in various sizes for cutting odd holes in sheet metal. The one
I am thinking of for your purpose is hand operated, much like
a pair of pliers. This device can be started at an edge or,
in your case a hole about 3/8" diameter, and by working the
handles it will cut little bits of material producing a slot
or kerf about 1/8" wide. You work it along the line of cut
and can create openings. I have used these in mild steel sheet
up to about .04" thick. I don't know how thick your tank material
is but there are power nibblers that essentially do the same
thing that will cut heavier materials.
None of these devices/methods produce heat or sparks and
would be safe to use in your tank.
I would recommend contacting a metal fabricator in your boatyard
or elsewhere as they know about these devices and can either
come do the job or perhaps rent the tool to you.

Pete
1983 Bayliner 2260 Trophy
Puget Sound, Washington State
sandollar
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Posted: 13 July 2006 at 2:38pm | IP Logged

Our "belly" tank is leaking (diesel)..would like to repair it without removing it from the boat (very difficult)..have been told that their is resin that can be poured into the tank that will seal it..is anyone familiar with this??

Majestic Dream
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Posted: 16 September 2006 at 5:20pm | IP Logged
I found a product from Caswell Plating that coats the tank with resin. I going to try it!
Majestic Dream
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Posted: 24 September 2006 at 1:39pm | IP Logged
I've cut two additional 6x6 holes to get to the divided compartments, cleaned all the crud out and now ready for the supper cleaning and then applying the expoxy coating. Will let you know how that goes.

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