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Old 02-26-2015, 07:52 AM   #15
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Angle grinder or dremel tool with metal blade will cut the pan pretty easily. I cut mine out only between frame rails when installing tanks, leaving banana wraps in place.
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Old 02-26-2015, 08:00 AM   #16
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If I replaced belly pan I would pull all of insulation under floor out as fiber glass soaks up water then where ever wet floor rots out also causing frame rust. Trailers that are not used in frigid weather does not need insulation, the only reason I see is sound deadener. Many other trailers do not use belly pans or put insulation where would get wet, weep holes in belly pan good idea, insulation bad.
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Old 02-26-2015, 08:04 AM   #17
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Thanks so this is the whole belly pan right , it has patches as you can see.this was way south of texas san benito...sat for 9 years
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Old 02-26-2015, 08:05 AM   #18
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Here's water tank...what do I do there , it don't work anyway
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Old 02-26-2015, 09:02 AM   #19
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Here's water tank...what do I do there , it don't work anyway
The water tank is held up in place by a piece of 1" thick plywood that sits in rails. The downward face of the plywood is covered with a sheet of aluminum just like the bellypan. I dropped the tank and documented it some here:

My Airstream Adventure, Making a 1973 Overlander Our Own.: Dropped the FW tank and here:
My Airstream Adventure, Making a 1973 Overlander Our Own.: Tank is back in, new outrigger covers fabricated and weled. Wheels are finally all on.
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Old 02-26-2015, 09:10 AM   #20
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Has anyone used or had the bottom side of the floor panels sprayed with closed cell foam insulation that is used in homes while having the belly pan removed? If so what type of results did you have? Thanks

It would probably work well for insulation but I wouldn't do it. One of the biggest issues with the original spun fiberglass insulation is that it tends to hold water up against the frame and promote rust over time. If you spray the whole bottom of the frame with this stuff, you will cover up some of the frame and thereby encapsulate it. If water can get in (and it will find a way) then you have set yourself up for trouble.

The best solution I have found is to use the solid foam boards cut to fit underneath between the frame members and held up with screws and fender washers. This should let the frame dry if any water can get up underneath since it can drip down and out. Remember, water that gets between the the interior and exterior skins wont be seen unless its a lot and you can notice staining on the plywood floor. It will eventually run down to the bottom as well and you don't want it to hang around any longer than necessary.

Here is a link to show how it came out on my rig: My Airstream Adventure, Making a 1973 Overlander Our Own.: Progress but at the cost of an eye injury
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Old 02-26-2015, 10:25 AM   #21
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Wow thanks that will help alot this is why I love this app there's always help...
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Old 02-26-2015, 11:21 AM   #22
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Thanks for the input of knowledge, well noted...
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Old 02-28-2015, 04:38 AM   #23
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Ok so if all planed out and have everything in place ready to start how long does it take to finish belly pan.Really want to do this in one weekend.
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Old 02-28-2015, 06:19 AM   #24
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Ok so if all planed out and have everything in place ready to start how long does it take to finish belly pan.Really want to do this in one weekend.

One weekend? Are you serious? I really doubt it unless you have lots of help and perfect working conditions. What are you planning to do? Just replace the pan, What will that accomplish?

Your focus should be to remove the pan and go over the whole bottom of the rig, remove rust off the frame and preserve and paint. You would be well advised to also pull off the lower wraps as well and look at the outriggers. From the few pictures I see, if the aluminum is that corroded you will probably have water damage on the frame and probably the subfloor. If its on the perimeter than it affects the structural integrity of the whole trailer since that plywood is what holds the whole thing together as a rigid box. And what do you think you will find when you drop the water tank?

Sorry to sound harsh, but I don't get the impression you know what you are jumping into.
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Old 02-28-2015, 08:31 AM   #25
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Appreciate the truth advice will check everything an wait on warm weather for 2 weeks
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Old 02-28-2015, 06:29 PM   #26
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Yep what Bob said. Removing and replacing the belly pan aluminum is the result of a much larger project to repair and refurbish the frame and axles of your trailer. If your belly pan looks bad and is coming loose, it is a good sign there is more trouble under there.

My rear bathroom floor was rotted through on my 66 Trade Wind. My axles were 48 years old and needing replacement. And I wanted to install waste water holding tanks. So the belly pan came down.

I replaced the rotted subfloor, replaced the axles, installed new holding tanks, cleaned and painted the frame, installed new subfloor insulation, installed new furnace ducts, and installed new aluminum belly pan. All this took me 3 months! it was a ton of work. i enjoyed it! Especially having the POR 15 rust proofing paint drip all over me.

You can see what a dirty job this is from my photo below. Uck!

I can't think of a good reason just to replace the belly pan. If your trailer doesn't need all the major maintenance, then just repair your belly pan and hit the road.

David
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Old 07-21-2016, 08:08 PM   #27
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74 31' sovereign

Does anyone have any pictures of the rear tanks for a 31'. Rear bath?. Mine was missing both tanks, all plumbing and the pan that held the tanks in. It did have gray and black tanks. But i cant find any pictures of what they looked like other than a drawing. Not sure what to use as a supporting pan if i find tanks.
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Old 07-22-2016, 07:39 PM   #28
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Hello there. New waste water tanks are available. I do not know what was originally in a 74 Sovereign Airstream. But I'll bet you will soon find out on these forums.

Maybe your belly pan and old insulation removed and you are looking at the frame for buckling and rust. Rear end separation on long 70s trailers is not uncommon. Having the weight of waste water tanks toward the rear of the trailer is not the best.

Here is a photo of the tanks I installed in my 66 Trade Wind. It was a very big project. I drew up and had fabricated an aluminum "tank cover" for my tanks similar to my 86 Limited. I insulated the pan, but it does not hold the tanks up. I hung my tanks from angle irons bolted to the frame rails.

David
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