My problem was in the 90s and nipples on holding tank. Acid alone would not clear them.
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Thread: Master head won't drain
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Re: Master head won't drain
Ray
1983 61CY 319
AnnaVal
Jacksonville FL.
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Re: Master head won't drain
Added the phosphoric acid to the line It only took about a pint. I hr later bubble bubble toil and trouble. Foaming and overflowing. Going to give it a day, drain as much as I can, and repeat. Disconnected at Blackwater tank, so I can tell if the line breaks open to drain.
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Re: Master head won't drain
Update - Drained as much acid as I could from exposed line. Refilled & waited 2 days. No movement in fluid level. Thought maybe a little pressure might help erode the plug. 60lbs...to much. Split at old connection and literally a sh*t storm in the engine room. Took 4 hours to clean up that mess.Today, ran 18' of a 25' drain augers into line. Measured run 18'. Reattached air line & pressured to 20lbs. If it won't bleed air, no chance with a liquid. Any ideas?
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Re: Master head won't drain
I would remove line from holding tank as good chance issue is there. That is where my restriction was. If not at least you can work from both ends. If it is mid line somewhere you probably have a crushed line or some fitting that is where blockage is occurring.
Ray
1983 61CY 319
AnnaVal
Jacksonville FL.
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Re: Master head won't drain
I removed the fitting from the tank before I started this journey, and have terminated in a bucket to try and see when flow restored. No joy.
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Re: Master head won't drain
I removed the fitting from the tank before I started this journey, and have terminated in a bucket to try and see when flow restored. No joy.
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02-22-2019 09:01 PM #58
Re: Master head won't drain
Run a snake through and make sure you can see both ends. I'd not you have the wrong end somewhere. Check for valves too. Just in case it's been re routed and you didnt know it
Scott
41C117 "Hattatude"
Port Canaveral Florida.
Marine Electronics and Electrical Products Distributor.
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Re: Master head won't drain
Did you work snake from holding tank back to valves that allow diverting to overboard discharge? Once you have idea of how far snake goes it will give you idea where blockage is. My valves were in generator space starboard side for master and guest head. Forward head was in space bellow forward cabin. I was lucky on my boat Hatteras had run a pvc chase from engine room to generator space. I used this to run new line as old rubber hose was failing anyway.
Ray
1983 61CY 319
AnnaVal
Jacksonville FL.
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Re: Master head won't drain
I'm at a loss unless, as Scott suggested, there's a valve in there somewhere. There should be two valves associated with each pump. One is at the seacock for overboard discharge. The other selects the line to the overboard discharge or the line to the holding tank. Are you certain you have found them both? Your snake will get stopped at a ball valve or at an elbow.
Sounds like you're going to have to get a visual on the hose exterior and look for anything other than hose. Also may be useful to use a Depstech type camera. Running both ends of the hose, you would have plenty of reach for the camera. These units are inexpensive, and you'll find plenty of uses for them beyond this issue.
Finally, if you have a clog from toilet paper (or other foreign object), acid will not clear it. Have you applied air pressure from both ends?Semper Siesta
Robert Clarkson
ASLAN, 1983 55C #343
Charleston, SC