Home » Public Forums » GMCnet » Re: [GMCnet] Best method to pull black tank?.
| Re: [GMCnet] Best method to pull black tank?. [message #306005] |
Fri, 26 August 2016 11:05  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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I've pulled tanks in two GMCs. I wasn't impressed with the construction of those tanks. I got new tanks from Jim K at Applied GMC. Extremely well made. Used his rubber slip joints for the pipes that come from inside the coach. So simple to install. Plus they'll never leak. Then since there new. I put a rinse nozzle in so I can keep them from having any build up inside.
Bob Dunahugh
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| Re: [GMCnet] Best method to pull black tank?. [message #306048 is a reply to message #306042] |
Sat, 27 August 2016 14:04  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Pete,
Since I gave Bob the idea, I'll answer -- he can add any changes he made:
1. Get one of these water inlet fittings, or similar:
2. Pick a location high on the SIDE of the black water tank adjacent to
the side opposite the drain outlet.
3. Measure across the tank from that location to the other side of the
tank, call that X".
4. Fit a piece of PVC pipe with a 1/2" male pipe thread cemented on one
end and screw it into the water inlet fitting.
5. Cut the pipe and cement a cap on the other end so that the length from
the back of the inlet fitting to the end is
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Best method to pull black tank?. [message #306049 is a reply to message #306048] |
Sat, 27 August 2016 14:32 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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The last couple of waste tanks that I installed were fitted with grommets
that fit standard size pvc pipes. Simply mark where you want the holes,
drill a pilot hole for the center drill on the hole saw, and zip, you have
a place to install the grommet. Wrestle the grommet into place with a bit
of silicone grease, shove the pvc pipe into the grommet, and EZ-PZ, you are
done. They don't leak, are vibration resistant, and if/when you need to
drop the tank, they slip out as easily as they went in. They also don't
crack the tank over time like the cemented flange fittings do. Also they
mount with support from underneath, not a rigid flange around the
circumference of the tank like the originals. Most of those type I have
encountered are cracked and leak when they get nearly full. As a standard
rule, I will not patch a tank. If it is leaking, my only solution is to
replace the 40 year old plastic tanks with fresh new plastic ones that have
not outgassed all of their softening agents. Just what I do.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Aug 27, 2016 12:05 PM, "Ken Henderson" wrote:
> Pete,
>
> Since I gave Bob the idea, I'll answer -- he can add any changes he made:
>
> 1. Get one of these water inlet fittings, or similar:
>
>
>
> 2. Pick a location high on the SIDE of the black water tank adjacent to
> the side opposite the drain outlet.
>
> 3. Measure across the tank from that location to the other side of the
> tank, call that X".
>
> 4. Fit a piece of PVC pipe with a 1/2" male pipe thread cemented on one
> end and screw it into the water inlet fitting.
>
> 5. Cut the pipe and cement a cap on the other end so that the length from
> the back of the inlet fitting to the end is the pipe to act as nozzles for a water spray. Continue drilling holes to
> achieve the flow pattern desired.
>
> 8. With a hole saw just large enough to admit the fittings on the back
> side of the inlet fitting, drill an access hole in the tank at the location
> selected in 2., preceding.
>
> 9. Install the tank flusher in the hole, aiming the spray pattern toward
> the tank outlet, and seal it well with caulk -- even silicone. Secure it
> to the tank with sheet metal screws.
>
> 10. Permanently attach a length of water hose to reach a location of your
> choice and there mount a connector of your choice. I use a hose quick
> disconnect mounted on the rear crossmember at the left rear.
>
> 11. Try it out.
>
> It's quicker to make one than to write about it! :-)
>
> Since my flusher is mounted as high as possible in the tank, and the inlet
> fitting came with a check valve, I didn't bother to add another check
> valve, and haven't had any problem during the 18 years mine's been in use.
>
> I only use the flusher when I suspect there's beginning to be a build-up in
> the tank, primarily because I don't use chemicals in my tank and don't want
> to clean the tank TOO thoroughly, possibly damaging the beneficial
> bacterial colony in there.
>
> Ken H.
>
>
> On Sat, Aug 27, 2016 at 11:54 AM, Pete Smith wrote:
>
>> Bob,how is the rinse nozzle hooked up?
>>
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| Re: [GMCnet] Best method to pull black tank?. [message #306114 is a reply to message #306005] |
Mon, 29 August 2016 11:27 |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
Karma: 1
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Senior Member |
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Just thought I'd add that what really helped us install the new tank was making a template out of a piece of wood first to see where the holes lined up first, before we cut them in to the tank. This allowed us to cut the holes in the wood first, then hold it up to make sure everything was aligned properly, then use the wood as a guide to cut the holes in the real tank. We actually messed up and mis-measured one of the holes and had to re-do the template one time, which is MUCH better than messing up the tank!
We purchased the tank from Cinnabar which did not have any of the top holes pre-cut. The back drain and sensor holes were in place though. They use the same grommets mentioned here.
More here:
http://www.gmcmhphotos.com/photos/black-tank-replacement/p56777-grommet-hole-template.html
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
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| Re: [GMCnet] Best method to pull black tank?. [message #306164 is a reply to message #306048] |
Tue, 30 August 2016 15:57 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Looking for something else, I discovered that I had an album of the black
tank flusher, so here's a link in case my description wasn't sufficient:
https://goo.gl/photos/JhXojNuT4mqMYWZ47
Ken H.
On Sat, Aug 27, 2016 at 3:04 PM, Ken Henderson
wrote:
> Pete,
>
> Since I gave Bob the idea, I'll answer -- he can add any changes he made:
>
> 1. Get one of these water inlet fittings, or similar:
>
>
>
> 2. Pick a location high on the SIDE of the black water tank adjacent to
> the side opposite the drain outlet.
>
> 3. Measure across the tank from that location to the other side of the
> tank, call that X".
>
> 4. Fit a piece of PVC pipe with a 1/2" male pipe thread cemented on one
> end and screw it into the water inlet fitting.
>
> 5. Cut the pipe and cement a cap on the other end so that the length from
> the back of the inlet fitting to the end is the pipe to act as nozzles for a water spray. Continue drilling holes to
> achieve the flow pattern desired.
>
> 8. With a hole saw just large enough to admit the fittings on the back
> side of the inlet fitting, drill an access hole in the tank at the location
> selected in 2., preceding.
>
> 9. Install the tank flusher in the hole, aiming the spray pattern toward
> the tank outlet, and seal it well with caulk -- even silicone. Secure it
> to the tank with sheet metal screws.
>
> 10. Permanently attach a length of water hose to reach a location of your
> choice and there mount a connector of your choice. I use a hose quick
> disconnect mounted on the rear crossmember at the left rear.
>
> 11. Try it out.
>
> It's quicker to make one than to write about it! :-)
>
> Since my flusher is mounted as high as possible in the tank, and the inlet
> fitting came with a check valve, I didn't bother to add another check
> valve, and haven't had any problem during the 18 years mine's been in use.
>
> I only use the flusher when I suspect there's beginning to be a build-up
> in the tank, primarily because I don't use chemicals in my tank and don't
> want to clean the tank TOO thoroughly, possibly damaging the beneficial
> bacterial colony in there.
>
> Ken H.
>
>
> On Sat, Aug 27, 2016 at 11:54 AM, Pete Smith wrote:
>
>> Bob,how is the rinse nozzle hooked up?
>>
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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