Home » Public Forums » GMCnet » Black tank fittings problem.
| Black tank fittings problem. [message #167340] |
Mon, 23 April 2012 19:30  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Though the most serious PO was meticulous about maintenance, someone did the coach an serious injustice. At some time, probably to get the black tank down, the two 1-1/2 at the rear corner were bastardized. It seems they managed to reuse one coupling, but destroyed the other. What they did leave didn't matter because they used steel pipe to screw into the black tank fittings. The remains of the original coupling are probably not usable. Of course I get to work on most of this stuff on my back under the jacked up coach.
So, both of the black tank female threaded opening need to be reconstructed. I may have a local guy that can weld them in, but he does not have the 1-1/2 NPTF in poly to weld in there and I have had no success in locating a supplier. (yes, I sent JimK an e-mail.)
Has anybody else had to re-work this area?
If it was successful, can you tell me what you used?
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Black tank fittings problem. [message #167356 is a reply to message #167340] |
Mon, 23 April 2012 21:25  |
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wally
Messages: 643
Registered: August 2004
Location: Omaha Nebraska
Karma: 5
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| Matt Colie wrote on Mon, 23 April 2012 19:30 |
Though the most serious PO was meticulous about maintenance, someone did the coach an serious injustice. At some time, probably to get the black tank down, the two 1-1/2 at the rear corner were bastardized. It seems they managed to reuse one coupling, but destroyed the other. What they did leave didn't matter because they used steel pipe to screw into the black tank fittings. The remains of the original coupling are probably not usable. Of course I get to work on most of this stuff on my back under the jacked up coach.
So, both of the black tank female threaded opening need to be reconstructed. I may have a local guy that can weld them in, but he does not have the 1-1/2 NPTF in poly to weld in there and I have had no success in locating a supplier. (yes, I sent JimK an e-mail.)
Has anybody else had to re-work this area?
If it was successful, can you tell me what you used?
Matt
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Matt, I've seen these grommets used...
http://www.rveparts.com/products/Waste-Holding-Tank-%252d-Grommets-%252d-1-1%7B47%7D2%22.html
HTH
Wally Anderson
Omaha NE
75 Glenbrook
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| Re: Black tank fittings problem. [message #167357 is a reply to message #167340] |
Mon, 23 April 2012 21:33 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Matt,
My black tank had similar issues -- the steel pipe nipples were original fittings, and when they rusted they split the inlet collars.
http://www.gmcmhphotos.com/photos/73-painted-desert-230/p31250-black-tank-inlets-73.html
There was also the beginning of a split in the tank top between the two inlets -- A local tank repair/building company did this for me...
http://www.gmcmhphotos.com/photos/73-painted-desert-230/p31395-0053.html
My tank was polyethylene.
If you can just remove the collars there are rv tank rubber fittings that can be inserted into the holes and they accept a slip pipe.
I also replaced the fittings above the inlet with rubber fittings from Lowes....
http://www.gmcmhphotos.com/photos/73-painted-desert-230/p36326-gmc-plumbing-drain-010.html
I have some additional photos of the above fittings -- but have not loaded them to the photo site -- if you need them.
Hope this helps.
Dennis
Edit -- deleted thread size
| Matt Colie wrote on Mon, 23 April 2012 19:30 |
Though the most serious PO was meticulous about maintenance, someone did the coach an serious injustice. At some time, probably to get the black tank down, the two 1-1/2 at the rear corner were bastardized. It seems they managed to reuse one coupling, but destroyed the other. What they did leave didn't matter because they used steel pipe to screw into the black tank fittings. The remains of the original coupling are probably not usable. Of course I get to work on most of this stuff on my back under the jacked up coach.
So, both of the black tank female threaded opening need to be reconstructed. I may have a local guy that can weld them in, but he does not have the 1-1/2 NPTF in poly to weld in there and I have had no success in locating a supplier. (yes, I sent JimK an e-mail.)
Has anybody else had to re-work this area?
If it was successful, can you tell me what you used?
Matt
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Dennis S
73 Painted Desert 230
Memphis TN Metro
[Updated on: Mon, 23 April 2012 22:02] Report message to a moderator |
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| Re: Black tank fittings problem. [message #167397 is a reply to message #167340] |
Tue, 24 April 2012 08:34 |
Jim Wagner
Messages: 339
Registered: February 2004
Location: Brook Park, Oh
Karma: 0
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Senior Member |
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Matt,
I have the black tank that I removed from our 26' Glenbrook. I was going to make a patio table out of it but Sandy thinks we might have a problem with flies. If you could use the female fittings let me know.
Jim Wagner
Brook Park, oh
Though the most serious PO was meticulous about maintenance, someone did the coach an serious injustice. At some time, probably to get the black tank down, the two 1-1/2 at the rear corner were bastardized. It seems they managed to reuse one coupling, but destroyed the other. What they did leave didn't matter because they used steel pipe to screw into the black tank fittings. The remains of the original coupling are probably not usable. Of course I get to work on most of this stuff on my back under the jacked up coach.
So, both of the black tank female threaded opening need to be reconstructed. I may have a local guy that can weld them in, but he does not have the 1-1/2 NPTF in poly to weld in there and I have had no success in locating a supplier. (yes, I sent JimK an e-mail.)
Has anybody else had to re-work this area?
If it was successful, can you tell me what you used?
Matt
--------------------------------------------------------------------------------
Matt & Mary Colie
'73 Glacier 23 Chaumière (say show-me-air)
Just about as stock as you will find
SE Michigan - Twixt A2 and Detroit
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| Re: Black tank fittings problem. [message #167499 is a reply to message #167496] |
Tue, 24 April 2012 21:11 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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[quote title=Matt Colie wrote on Tue, 24 April 2012 20:46][quote Dennis,
I have found several sources for those grommets, what I am having a hard time getting is dimensional data for them.
My tank has cracks too, but not between the holes. These both go way from the holes. I'm taking pictures.
Matt [/quote]
Matt,
This one for 1 1/2 inch pipe states it requires a 2 1/4 inch hole and is 1 3/4 inch long.
http://www.dyersonline.com/ameri-kart-1-1-2-rubber-inlet-grommet.html
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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