black water tank leak

[des48]

Hi DR. Dan here, I need some help with my 76 clipper. I drove over some very rough road and when I arrived, I noticed that my black water tank was leaking. The leak is coming from the top of the tank even when the tank is empty. When I flush the toilet or run the bathroom sink it immediately leaks. the tank doesn't appear to have fallen. Are the sink drain and the toilet some how connected, it seems that if all the fittings run vertically into the tank . I would not have such a bad leak ? If I have to drop the tank can anyone tell me how this is done ? I was told that all the lines that run into the tank are threaded in? Does anyone no where I can get my hands on a schematic for the plumbing ? Because of the cost, I will have to do this myself. Boo hoo, help help :

[mccammonds]

I have an 821F 1975 with a 360.   The drain from the little sink in the bathroom does feed my blackwater tank.  The rest of the drains goes into the gray water tank.  I have repaired leaks on these "plastic" tanks by using just plain ABS cement used for black pvc pipe.  Just clean the spot and apply several coats of the black glue.
I have no idea how you would remove the black or the gray tank.   I have two strap hooks holding  the back of both the gray water and black water tanks.

The black and gray water valves and pipe are glued together at the joints..  BUT!!  I don't know if all the coaches were made the same.

[des48]

thanks, but unfortunately not all clippers have abs tanks. Mine happens to be polyethylene which cannot be fixed with abs cement. Like I said before, the leak is in the fittings on top of the tank which means to fix it, I have to drop the tank (the black water tank) I would appreciate any other ideas. thanks
Dr. Dan

[Horst]

what about removing the toilet and having a look at things - toilet removal is easy - you me be able to see the source/root of your problem
that's what I would do anyway........