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HELP! Bad smell from under dinette seat


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Greetings,

For some background we bought a 2017 Elite 2 twin almost 2 years ago and off and on we have a bad smell thats strongest from under the dinette seat nearest the bathroom. It does NOT smell like sewer,mildew,rotten eggs,propane or electrical, its not a smell we can identify. It does not smell in the bathroom or in the toilet,(new last Dec) not the fridge area it comes mainly from inside the dinette storage area, its never wet, no obvious leaks and we have tried a few different methods for thoroughly cleaning the black and gray tanks, no smells from the drains and if we open the windows it goes away but comes back when closed up. I have read some reply's from another Oliver blog but our smell is mainly at floor level not the ceiling. Any ideas are appreciated. TIA

 

NHBoomers

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If you're sure it's not sewer or propane, another suspect could be the gray tank vent. Gray tanks can smell as bad as black, believe it or not. Your vent stack could be disconnected somewhere. Maybe someone else can describe the routing of the vent pipe.

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Stephanie and Dudley from CT.  2022 LE2, Hull #1150: Eggcelsior.

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Posted (edited)

The bathroom sink, black tank and grey tank all share the same vent pipe, part of which is actually used as the drain pipe for the sink and shower drain. 

Your odor could be due to grey tank fumes coming up thru the shower or sink drains if the back flow preventer slide valve is open. 
 

Also check the tightness of the steel bands on the fernco connectors in that area. 

Edited by ScubaRx
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Steve, Tali and our dog Rocky plus our beloved Storm, Maggie, Lucy and Reacher (all waiting at the Rainbow Bridge)

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If the shower/bathroom Valterra valve seal has been compromised or worn out, then there might be leak there too.  The collar that ScubaRx is referring too is there to facilitate the replacement of the valve or seals in this 1 1/2 inch drain.  If you do want to replace the Valterra seals, you will need to eventually slide the collar of the union on the 1 1/2 inch PVC drain pipe to allow the pipe connecting that side of the valve to be backed off enough to do the seal replacement on both sides of the valve.  Be careful not to lose the screws and nuts on the valve as you disassemble.  The cable can be temporarily removed by using an Allen wrench on the SS piston that moves the valve to open/close.  If the valve requires much force to close it, you may have a seal that is being pushed by the blade itself which compromises its integrity.,

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David Caswell and Paula Saltmarsh

Hull 509 "The Swallow"

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Also, check to make sure the drain pipe from the bathroom sink and shower is firmly seated into the top of the gray tank.  Ours was not glued, just wedged in and it popped out once after a bumpy ride.  Mike

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Good Morning,

13 minutes ago, Townesw said:

Battery gas? Have you looked for leaks in the battery compartment?

We have only lithium batteries, but we will be investigating the plumbing from top to bottom-thanks

 

NHBoomers

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Dead mouse?

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Posted (edited)

Greetings,

In case anyone is wondering this is what we have found so far, we thoroughly cleaned both tanks with some Dawn dish liquid filling and letting each sit for a day then rinsing out good, we started at the top of the vent pipe outside and traced all the way down,nothing is loose or wet, there is good airflow all the way up the vent pipe, the drains don't smell all is good there there is nothing organic but what we think is the cause is lack of air circulation under the dinette benches and with the help of some Ozuim the smell is about 90% gone and rite now we have the bathroom for blowing out, bathroom door shut dinette benches open,windows open and the smell is all ending up in the bathroom so not knowing what is cause or effect for sure we are going to put in some vents  and a fan or 2 in the dinette benches, it only smells on the driver's side even in the storage compartment in the back. It wont hurt to have more air circulating, the downside to not full timing I guess or maybe its not that and its wishful thinking. We do appreciate all of your comments we checked everything you all mentioned (no dead mouse) so thanks!!!

 

NHBoomers

Edited by NHBoomers
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1 hour ago, NHBoomers said:

We do appreciate all of your comments we checked everything you all mentioned (no dead mouse) so thanks!!!

Little Mouse GIF

2023 Ford F150 Lariat 3.5EB FX4 Max Towing, Max Payload, 2016 Oliver Elite II - Hull #117 "Twist"

Near Asheville, NC

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Have you pulled the bottom left kitchen drawers out to inspect for a faucet leak that can wet wood in that area? Sounds like you've done due diligence with the plumbing so I thought it might be worth a look.

It took over six months to find out this was the source of an odor in our camper which was detected in various areas over time. All close to the floor. The odor seemed to move around but I didn't detect it around the drawers until I removed them. It was a peculiar odor that eventually took on an ammonia component. Ammonia odors are classic symptoms of a refrigerant leak, but even while checking out the refrigerator I could not tell the source was the wet drawers.

Edited by Corvus
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Jerry & Kathy

2019 LEII Standard #539 + 2019 Tundra Limited 4X4

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