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Old 07-13-2015, 08:47 AM   #1
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Join Date: Jul 2015
Location: South Carolina
Posts: 2
SUN #7555
retirednavy is an unknown quantity at this point
holding tank shut off valve on open

I recently purchased a 1976 10 ft. Sunline. I tried to empty the holding tank into a mobile tank and the shut off valve didn't open. Will I have to replace the valve? I too am from Vermont but living in South Carolina.

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Old 07-13-2015, 03:22 PM   #2
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Join Date: Jul 2012
Location: Pennsylvania
Posts: 735
SUN #4050
Wannabes is an unknown quantity at this point
So, the valve stem won't move at all? Or, did the valve stem move, but the valve disc didn't move with it? Those would be two different problems.

Not sure how it is with the 70's-vintage trailers, but from the 90's on the valve discs were made of Teflon. Standard maintenance is to lube the valve discs with silicone spray. If you're experiencing scenario #1, where even the valve stem won't move, try opening the drain cap and spraying silicone spray up into the opening and onto the valve disc (using those little extension tubes that come with spray cans is helpful). Also try spraying silicone where the valve stem enters into the valve body in the hope that some will make its way into where the stem travels, and subsequently loosen things up a bit.

If you're experiencing scenario #2, where the handle moves and the valve itself doesn't open, I'd say you'll need a new valve in its entirety.

Someone who knows more than me about this particular issue should be along soon to offer further advice.

Thank you for your service to our country, RetiredNavy!


Matthew and Lisa
TT: '02 T-2363;
TV: 2012 Ford F-150, 4x4/Off-road, 5.0L V8, "Big Gray"
Reese Straitline w/ dual cam
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Old 07-14-2015, 07:30 AM   #3
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Location: South Carolina
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SUN #7555
retirednavy is an unknown quantity at this point
It is scenario # 2. I would think that the sludge would have to be pumped out from the
top before changing the valve. Wondering how to do that?
I am retired and did 6 years in the navy during the Viet Nam war. I realize my handle is misleading and I apologize. My ptsd reoccurring nightmare was that the navy wouldn't let me out so I feel like I retired from the navy. I think it had to do with the black boxes in sere training in warnersprings. (196
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