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Old 08-13-2008, 12:33 AM   #1
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1974 27' Overlander
Placerville , California
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Replacing black water tank 1974 overlander

I have looked over the threads but mabe I am missing something. Need some directions or help on replacing my blackwater tank. There seems to be a leak when it is full. When its full get some dripping on the ground out side by the frame. Have no idea if the tank is cracked or leaking at some gasket. I don't have any idea how to access the tank. I assume it from under the trailer. Any help or input would be greatly appreciated.
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Old 08-13-2008, 03:55 AM   #2
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1974 27' Overlander
1954 26' Romany Cruiser
1960 26' Overlander
Rockingham County , New Hampshire
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You will need to remove some of the underside aluminum sheeting. Mine has an access panel cut out. May not be your tank. could be a valve leaking at the body or the joint.

Rear bath? Got pics..?

I need to check out mine this week. Not dripping but I have an odd smell.
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Old 08-13-2008, 05:46 AM   #3
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We have the drip when full in the grey tank, and an odd smell.
In order to remov ethe tank, you will have to remove the drain line from the back of the tank in the bumper compartment, it's pretty easy.
For the black tank on the rear bath, you would drop the belly pan enough to gain access, then you will find a bar made from angle iron at the rear of it. Support the tank, remove the bolts holding the angle iron in place, and remove th e angle iron. You can then lower the tank. Watch for the fittings, you don't want to damage them when you lower it.
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Old 08-13-2008, 09:15 AM   #4
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1974 27' Overlander
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Mine is a center bath and its certainly not in the shape of balrgn. Since mine is center bath is the black tank mounted in a different place? There is a pan on the underside with a piece of angle in that goes under that pan. Do I need to remove that pan? Is the black tank mounted to a vent? How about the toilet will I have to remove it first? I don't see how I can access the connections with out lowering the tank. Also I don't have any connection in the bumper. Looks like there was a connection for the drain at one time. I have only had this trailer for a few months so I am still learning alot of things. Does anyone have any pics on this kind of repair. I have heard that you can't really repair these tanks. What are the made of? BTW thanks for all the input this is a great forum.
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Old 08-13-2008, 09:53 AM   #5
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1974 27' Overlander
1954 26' Romany Cruiser
1960 26' Overlander
Rockingham County , New Hampshire
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You have a center bath to? Sweet!

Yes, it is connected to a vent
Yes, you need to remove the toilet to drop it out.
I have an access panel cut in the underside of mine. Do you want me to take some pics tonight?

E-mail me I'll get you some pics
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Old 08-13-2008, 10:25 AM   #6
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1974 27' Overlander
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Balgrn if that's possible that would be great. Are you saying that there is a drain in the tank? Pull the under carriage pan and I will see a drain? The pics would really help. Thanks very much.
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Old 08-13-2008, 03:12 PM   #7
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1974 27' Overlander
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1960 26' Overlander
Rockingham County , New Hampshire
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I can't upload again, even tho I'm a contributing member, Hhmmmmmmm

I pulled my access panel off, lucky me! No leaks. Tweaked the fittings and put the panel back on. I did take a couple pics. E-mail me I'll send them along.

Got pics???
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Old 08-13-2008, 04:26 PM   #8
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I have a '74 service manual, I can probably at least scan the relevant pages and post them here later, if you want.
And we are working on Balrgn's picture issues.
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Old 08-13-2008, 04:33 PM   #9
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Tank Vendors say that a lot

Quote:
Originally Posted by ronsgto View Post
... I have heard that you can't really repair these tanks. What are the made of? ...
Some damage is repairable.

I'm coming up on five years, and almost 10,000 miles, on my repair.

Tom
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Old 08-13-2008, 04:37 PM   #10
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1960 26' Overlander
Rockingham County , New Hampshire
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I looked at my manual today, the tank does not vent it vents off the piping.
So, I can't upload, but I can create a page on my domain

Go here for pics

View of the Waste Piping

I'll upload the schematic for the piping in a while
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Old 08-13-2008, 04:38 PM   #11
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Quote:
Originally Posted by TomW View Post
Some damage is repairable.

I'm coming up on five years, and almost 10,000 miles, on my repair.

Tom

Nice Job. I'd go your route as well.
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Old 08-13-2008, 04:45 PM   #12
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Here are the pictures, until we get his photo problem sorted out:
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ID:	65654   Click image for larger version

Name:	waste pipe 3.jpg
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Old 08-13-2008, 05:37 PM   #13
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1954 26' Romany Cruiser
1960 26' Overlander
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Thanks AZ. It worked.

Here is the waste water layout.
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'74 Overlander (T-O-Bee)
'46 Spartan Manor (Rosie)
'54 Cruiser (Bogart)
'60 Overlander (Hoagy)
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WBCCI 1754 - AIR # 6281
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Old 08-13-2008, 10:55 PM   #14
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1974 27' Overlander
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Well you guys have been great. Now I have a real idea of what I need to do. I don't have any pics for now but I will try and get some and send it via email if thats okay.
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