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08-30-2015, 10:11 AM
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#1
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Montana Fan
Join Date: Mar 2015
Location: Pell City
Posts: 299
M.O.C. #17209
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Toilet bowl leak-down
2014 Mon HC. Thetford toilet, don't know what model. 1" or 2" of water will leak out in 15 minutes.Maybe the (gasket) seal but it looks and feels OK.Any lube for this ? Can it be replaced without removing toilet?
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08-30-2015, 10:21 AM
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#2
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Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
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lots of us have ditched the tetford and installed either the 310 or 320 by dometic. Reasons- bowl leaking away water, pedal coming off or breaking, toilet flooding the rv. Yes, you can go to home depot or lowes and get silicone grease in the plumbing isle. Apply and it may work for you. John
__________________
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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08-30-2015, 11:04 AM
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#3
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Montana Master
Join Date: Aug 2010
Location: Washington Coast
Posts: 2,688
M.O.C. #10696
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Your Thetford Toilet Leaking??? NO WAY!! LOL  that's a Shocker!,I went thru 2 of them on my 2012(flooded my Rv once) done the Plumbing grease thing Blah Blah Blah,get tired of that and do the Dometic 310 0r 320,my 2015 is leaking right now and I grease it every 3 days ,so when I get off the road in a few weeks I will buy ANOTHER Dometic,My buddies SOB has the same toilet and he has replaced his gasket 3 times
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08-30-2015, 12:40 PM
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#4
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Montana Master
Join Date: Aug 2008
Location: New Bern
Posts: 4,372
M.O.C. #8728
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Put some blue dawn and water in the bowl and let it sit. The seal has a bit of debris on it.
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08-30-2015, 12:42 PM
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#5
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Or wipe the gasket with vasoline or plumbers lube.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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08-30-2015, 03:11 PM
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#6
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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First Tetford had the flush handle literally explode off the bowl. Second Tetford leaked after just a few months. Did everything anyone on here suggested. Replaced the gasket twice. Finally replaced the toilet with a Dometic. Should have done that when be bought the rig and just tossed the Tetford out.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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08-31-2015, 04:16 PM
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#7
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Montana Fan
Join Date: Mar 2015
Location: Pell City
Posts: 299
M.O.C. #17209
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Called Thetford Cust.service today. Rep. said Dawn dish soap could damage seal. Went to Ace Hdwe. and got silicon lube. Is holding OK for now. Will have local service check it when at home,they can do Thetford warranty work.
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08-31-2015, 05:29 PM
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#8
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Montana Master
Join Date: Mar 2013
Location: Hanover
Posts: 1,471
M.O.C. #13325
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I really believe Thetford figured the valve shouldn't shut all the way unless you let the pedal up on it's own. That way you could travel down the road and not have nastiness slop out. Problem is that it won't and it really not cool having the valve not shut! We just let it fly up and will replace the thing when it breaks with a Dometic.
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09-01-2015, 12:22 AM
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#9
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Montana Master
Join Date: Sep 2014
Location: Full Timer In Naples, Florida
Posts: 1,049
M.O.C. #15731
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I fill the bowl with hot water let it sit, Then wipe down the gasket then use plumbers grease.
__________________
2017, 3500 Ram Big Horn, 4x4, Crew Cab, DRW, Aisin Transmission, 4:10. Curt Q20, 2014 Mountaineer 331 RLT, Sailun's on the rv and truck.
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08-17-2016, 02:25 PM
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#10
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Montana Master
Join Date: Mar 2015
Location: Gardnerville
Posts: 1,252
M.O.C. #17163
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Replaced with dometic! No problems now!
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08-17-2016, 03:11 PM
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#11
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Montana Fan
Join Date: Jun 2013
Location: Boise
Posts: 288
M.O.C. #13564
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Also replaced with Dometic 310. Very good and fairly cheap upgrade to the Montana, well worth the price and labor. Switch out was easy, just a little time consuming due to going to store for plumbing parts.
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08-17-2016, 05:40 PM
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#12
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Montana Fan
Join Date: Feb 2015
Location: Republic
Posts: 257
M.O.C. #16103
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As mentioned above in other posts (and as you did), be sure to use silicon plumbers' lube, petroleum jelly will degrade the rubber seal/gasket.
Replaced our stock Thetford with Dometic 320 w/sprayer, now wife and I are both happier campers 
Dave
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Dave, Barb, and Paisley the Wonder Wiemeraner
Was - 2015 3160RL Legacy Edition & 2014 F350 6.7l PSD SRW Platinum
Now - SOB
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