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07-21-2016, 01:15 AM
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#1
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Montana Master
Join Date: May 2005
Location: Fall Creek
Posts: 1,328
M.O.C. #3699
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Black and Gray Tank Valve Lubrication Fluids
On our 2015 we have had it out about 5 to 6 time so far. During the warranty period I told my dealer at least twice that the cable controls to both black and gray are very difficult to operate. Never had any satisfaction, valves still very difficult. I even had some sizable leakage when you take the pipe cap off. Finally on this last trip, the black valve for sure failed. Anyway they had it in the shop this week and finally dropped the belly and went through both black and gray valves and I hope the cables. I think the manager said they also replaced the valve seals or what ever they are. My question is about the valve lubrication fluids that I think Thedford makes to help with valve movement. Has anyone used this tank additive on their tanks, do you think I helps? Any issues with it messing up the tank sensors? Any ideas or comments please.
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Bob and Nancy Kassl Fall Creek, Wisconsin
2015 Montana 3440RL Legacy Edition, G614's, Pressure Pro TPMS, Dish Tailgaters
2016 GMC Sierra Denali 3500 CC SRW, Iridium Metallic, Duramax Allison Transmission
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07-21-2016, 03:42 AM
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#2
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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There have been a number of issues with the valve seals reported recently.
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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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07-21-2016, 03:52 AM
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#3
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Montana Master
Join Date: May 2005
Location: Fall Creek
Posts: 1,328
M.O.C. #3699
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Have you ever used that valve lube additive for easier valve actiln?
__________________
Bob and Nancy Kassl Fall Creek, Wisconsin
2015 Montana 3440RL Legacy Edition, G614's, Pressure Pro TPMS, Dish Tailgaters
2016 GMC Sierra Denali 3500 CC SRW, Iridium Metallic, Duramax Allison Transmission
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07-21-2016, 04:12 AM
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#4
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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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Have tried several with not much change. Dumping a big bottle of veggie oil down the toilet works better I thought. Remember that unless you are nose high, there will be remains left in the pipes...even after you think everything has drained. If you still have working tank readings with the stock monitor, it is a miracle fit for the books. John
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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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07-21-2016, 02:03 PM
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#5
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,690
M.O.C. #12947
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The only tank that has a tight valve is our black tank, and along with the treatment, I use a cap full of Calgon liquid and 4 ounces of the Thetford valve lube, each time I drain the tank, and it seems to be working OK. As time goes by, It does seem like the valve is operating a little easier, but that is after several years full time. As far as the sensors go, they usually do not work after a couple weeks of use.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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07-21-2016, 06:11 PM
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#6
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Quote:
quote:Originally posted by RKassl
On our 2015 we have had it out about 5 to 6 time so far. During the warranty period I told my dealer at least twice that the cable controls to both black and gray are very difficult to operate. Never had any satisfaction, valves still very difficult. I even had some sizable leakage when you take the pipe cap off. Finally on this last trip, the black valve for sure failed. Anyway they had it in the shop this week and finally dropped the belly and went through both black and gray valves and I hope the cables. I think the manager said they also replaced the valve seals or what ever they are. My question is about the valve lubrication fluids that I think Thedford makes to help with valve movement. Has anyone used this tank additive on their tanks, do you think I helps? Any issues with it messing up the tank sensors? Any ideas or comments please.
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Problem is more likely the cable pulls rather than the valves. They are longer than necessary and get looped up in the belly making them hard to operate. The cables also can corrode.
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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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07-22-2016, 05:52 PM
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#7
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Montana Fan
Join Date: Aug 2015
Location: Leavenworth
Posts: 268
M.O.C. #17706
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I had the same problem with Black tank valve. Paid $100 for a dealer to check it once, and no improvement. So, I decided to do check and fix the problem myself after reading some great info on this forum back around June.
First, the job is not that hard (but easier if not 6'3"/240 lbs ).
After dropping the belly and removing the black tank valve I found the gasket was deformed and forced into the groove keeping the valve from closing all the way. I replaced the gaskets and lubricated them and the actual valve and grooved track it moves in with plumbers grease; then reassembled. Works great; very easy and smooth. Been working great for the 2 weeks since I fixed it. Now, it makes my grey valve feels difficult, so I plan to repeat on this one.
Like you, I thought it was the cable and maybe toilet paper causing the very stiff valve operation and failure to seal. That was not the case - deformed gasket replacement and valve lubrication fixed the problem.
Here is the link to the Topic:
http://www.montanaowners.com/forums/...ad.php?t=66825
Do take Tank emptying/rinsing precautions before removing the valve
Good Luck!
__________________
Bill & Mary Van Nuys
Leavenworth, KS
2014 3735MK Legacy, Sailun 637s, TST 507RV TPMS, 2 Battle Born 100 AMP Lithium Batteries, Slide Toppers
2015 Chevy 3500 LTZ, 6.6L Duramax 4WD, CC, LB, SRW with Allison Transmission
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