Elbow in wall cracked, any ideas?

[Rich in name only and about to be much poorer- Rich for short]

[IMG]

Black PVC 40 drain pipe 3 inch? From 1970s elbow cracked in ceiling going inti wall down pipe. Two toilets, tub, shower, 3sinks all drain into it. See picture. Any advice on how to repair without or even with cutting out three Y? Any super plastic repair glue that could be trusted long term.? Elbow is cracked from bottom to top where you can see the white. Oddly enough we can flush without leak for now. Suspect leak occurs when multiple users. Will have to make five cuts to get elbow out of wall. Holes in joists are not a problem so don't go there other than it makes cutting hard. Would love to hear there is a resin/epoxy/glue that could meld the PVC crack. If not advice on cutting and replacing will be greatly appreciated. [IMG]

[Anonymous]

Yep, "wonderful" plastic doing what it always does eventually. No glue that I know of. The only thing I'd try is Plastic Welding. Somewhat melt the crack area with a torch or electronics soldering iron and use a screwdriver to push and scoop the plastic to close and cover the crack... rarely, but sometimes it works for a good long time.

- Otherwise, you may find a Fernco Long Bend 90 to clamp at the wye's shoulder and down past a cut below the Elbow to clamp that to the bottom pipe...vegetable oil or dishwashing liquid will make it a possible possibility.

- Of course, best is to cut it all out with the toilet flange. The culprit shouldn't be an "Elbow" anyway and ONLY 2-45's or a Long Bend 90. You may also want to reinforce those never-been-legal drilled holes that reduced the joists to 2x4's. Also get a Nail-Plate for the stud wall's cut-away and all new wall insulation...the original stuff is almost completely dead by now.