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Old 03-23-2009, 10:21 AM   #1
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1970 27' Overlander
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Black Tank Removal Procedure

What is the procedure for removing black tank? How easy is it to do? From what I have read I need to removed belly skin, remove metal enclosure of tank and styrofoam which are already in bad shape. Remove rear bumper and Thetford valve. Remove angle iron that holds tank in place and lower tank while supporting. My question is about the vent. When lowering the black tank what do I do about the vent pipe? Then how do I reinstall new tank and line up vent properly? TIA for any info.
James
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Old 03-23-2009, 12:07 PM   #2
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That or you may be able to get to it from above if you have to replace the bathroom floor. If you get a replacement tank from Inland rv it should line up perfect. You may have to cut the vent if there is no quick connect disconnect.
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Old 03-23-2009, 12:07 PM   #3
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If your floor is in good shape you should be able to cut the belly pan off at the back end. Save whatever you cut off because you don't want to buy new aluminum unless it necessary. I did the whole black tank replacement. When I started digging I found all kinds of problems with the floor and the frame. Check out my thread.

http://www.airforums.com/forums/f36/...ion-38204.html

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Old 03-24-2009, 08:49 AM   #4
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Thanks for the info, so I should be able to just lower it after removing the angle iron that supports it? How do I cut the vent pipe if it is on the upper side of the tank, and then reconnect when installing new tank?
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Old 03-24-2009, 12:02 PM   #5
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You need to take the toilet out first before you lower the tank. If you have a crack in the tank just pay the money and get another one. Get one that is an exact duplicate of the old one. You can get them through Inca or airstream for the orginal black tanks. It is just easier for the whole process.
When I took off the belly pan I had to cut the bolts off the angle iron with a grinder. I had new angle iron make just like the old. I saved the old angle iron for the fabricator to copy. Make sure you notch exactly where the old angle iron was on the frame. I had to rebuild the brackets that the angle iron was bolted into because they were so rusted in one spot. Everything fit perfectly. I also recommend having a sheet metal worker make you a new box that holds the black tank. I made mine myself for $35.00. If I had to do it over again I would have paid the $50.00 and them do it. Save the old black tank box for your template. Again, no room for error. I also painted my box with por-15 and sprayed a liner in it.

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