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Old 09-11-2016, 04:38 PM   #11
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Originally Posted by troutslayer View Post
Don't drop it!
didn't.

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Originally Posted by abarkl View Post
Tie a string to it just in case it is dropped.
That would have been a good idea....but I didn't drop it

Ok, gotta rethink this.

I put the mirror down...vent pipe is right where it should be. Something didn't look right so I just pulled the under belly. Not as hard as I thought it would be.

Interesting enough, the toilet drops right into the edge of the tank...no side pipe. What I thought was a pipe is just the edge of the tank. These tanks do not have square edges, they are nice and rounded on the bottom with a nice contour that is slightly below the tank leading to the outlet. Makes for good emptying of the tank. It also seems the bottom of the tank is rounded for better dumping. Grey tanks are the same type, just smaller.

The second picture is on it's side...no time to rotate now.

So all mechanical seem to be ok...Underbelly was surprisingly clean and no sign of any critters, dead or alive. No sign of any leaking of anything...ever. One interesting thing is the straps around the bottom of the tank are really loose. I wonder if the tank is suspended only from the top, and the straps are only to "catch" the tank in an emergency??

So now I am just wondering if the issue is the Black Tank vent is right next to my bathroom roof vent (hatch) and escaping odors from the black tank are just coming in through the bathroom vent. I always leave the vent open in the summer to let the trailer breath.

Right now I'm stumped.
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Old 09-11-2016, 05:06 PM   #12
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Others have reported that with their bathroom fan running nasty smells will be brought in to the trailer. Not sure if this is your issue or not.
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Old 09-11-2016, 05:09 PM   #13
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I was hoping for pictures of the inside of the tank. Well, maybe not. But what about a GoPro?
I'm not sure it really helps but we have installed this vent cover on all RVs; https://www.amazon.com/Chaffee-Eng-V.../dp/B00RZY7D4K

Many owners swear by this one; https://www.amazon.com/Camco-40595-W.../dp/B003P64XU4

And here are the replacement check valves; https://www.amazon.com/Oatey-39012-L.../dp/B000KKSP52

P.S. Your theory about the vent odors entering through the fan vent don't stink. Sorry, but this is just a ****ty topic. Ha ha!
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Old 09-11-2016, 05:18 PM   #14
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If you open the dump valve slow you always smell some black tank odor which is a normal condition. Tank straps are there for the installation process and have no other purpose. Those small fans in the bathrooms are just a waist because they do not cover the whole shroud.
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Old 09-11-2016, 05:37 PM   #15
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Recent tank smells we've had only while underway are from the grey and not black. Easy enough to cover all inlets and eliminate the smell.

What about running a tank flush wand from the toilet down
and/or from the drain up?
A blocked vent does cause many owners a problem, and many swear by the GEO method of cleaning.

Our motorhome also has a black tank check valve which can fail and it's accessible under the bathroom sink. The grey tank valve is actually mounted behind the furnace access panel under the fridge.
It is possible to have a "TP Dam" in the horizontal sewer line just past the toilet. Liquids flow past but solids, not so much.... Your tank may be clean but between the toilet and the "Dam" could be your problem.
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Old 09-11-2016, 06:18 PM   #16
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From what I can see, the tank is not "clean" but there are no major pieces of anything in the tank. I just flushed it again for about a 1/2 hour tpo.

With the Roof vent closed the trailer smells worse than ever. So not a vent fan issue.

The last thing I can think of is ordering a new toilet flange seal and maybe a new toilet. Running out of options and time. I saw on another post somewhere that the seals on the toilet cannot be replaced and sometimes they leak.

Quote:
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I was hoping for pictures of the inside of the tank. Well, maybe not. But what about a GoPro?
Sounds good, when are you bringing your by so we can try it out.

You need a light as well, but it was hard to see, flashlight in one hand mirror in the other, trying to get everything at the right angle to see.

Thanks for the hints on the vent caps. Also saw the 360 Siphon cap that has good reviews. New vent caps might be next in line, but would have to be done on the trip.
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Old 09-11-2016, 06:22 PM   #17
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It is possible to have a "TP Dam" in the horizontal sewer line just past the toilet. Liquids flow past but solids, not so much.... Your tank may be clean but between the toilet and the "Dam" could be your problem.
John7349, the trailer sat for a month with some leftovers in the tank. When I dumped there was absolutely no sign of anything solid. Everything liquefied. So I know I have a "clean" tank.
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Old 09-11-2016, 06:32 PM   #18
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John7349, the trailer sat for a month with some leftovers in the tank. When I dumped there was absolutely no sign of anything solid. Everything liquefied. So I know I have a "clean" tank.


I was thinking between the toilet and a possible "TP Dam" before the black tank.

Trapped sediment after liquids overflow the "Dam". A friend of mine had this happen.
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Old 09-11-2016, 06:41 PM   #19
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Dumb question here....did you remove and re-set the stool?
On our las used rv we cleaned it very well but couldn't get rid of a urine odor in the bathroom. On closer inspection I discovered a shroud around the base of the toiet that wasn't really obvious until I nearly stuck my head behind the stool ( not easy or fun). I removed the shroud and discovered a lot of dried urine crystals on the floor and base of the stool....the stool was porcelain and the shroud was plastic.
I cleaned and bleached the area and re installed the shorod. Never smelled bad again.
You say that you experienced a back up before the odor began. Could be that the stool isn't sealed well at the floor or there's a cover of some sort that isn't obvious until you feel around the back side.
Worth a shot....ya done everything else!
Good luck.
Tom
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Old 09-11-2016, 07:37 PM   #20
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Dumb question here....did you remove and re-set the stool?
Tom, No I have not removed the toilet yet. I have the Thetford Aqua magic V high 1 piece toilet. I have stuck my head and nose in places I am not comfortable with. Bottom line is I can't pinpoint where the odor is coming from.

However, that being said, I am ordering a new gasket for the toilet and might remove and reset just to make sure. Everything around the toilet looks totally clean, but like you said, I've tried almost everything else.
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