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Go Back   SailNet Community > On Board > Gear & Maintenance > Head Backfill
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Thread: Head Backfill Reply to Thread
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Topic Review (Newest First)
07-14-2013 04:38 AM
celenoglu
Re: Head Backfill

Backflow is the result of remaining fluid in the discharge hoses. Vented loop is for not getting the sea water from the sea. The only way is to change the non return valves of the toilet.
07-14-2013 02:08 AM
PorFin
Re: Head Backfill

Quote:
Originally Posted by ACKward View Post
...Leave the boat for a few days (this week, for a few hours) and the head is full of water (or worse, overflowed) upon return...
You're a braver man than I, Gunga Din...

I'm too afraid to leave seacocks open when we leave the boat
07-14-2013 01:23 AM
mitiempo
Re: Head Backfill

The vented loop may be done properly but they do require periodic maintenance. The duckbill needs cleaning as it can stick, and sometimes it needs replacing.
07-13-2013 10:06 AM
ACKward
Head Backfill

Curious: did the joker valve prove to be the problem? I'm having a backflow problem myself -- when the boat is at rest! Leave the boat for a few days (this week, for a few hours) and the head is full of water (or worse, overflowed) upon return. First time I've had any sort of issue since buying the boat, so I know the vent loop is configured properly and that the lines aren't clogged.
02-20-2013 02:24 PM
pdqaltair
Re: Head Backfill

Quote:
Originally Posted by Pamojo View Post
... (really should be the gag valve)...

Thanks!!


Yeah. Not much funny about that.

Actually, if you flush with water (and some folks like to add some vinegar) numerous times before you start it's no big deal.

Note that the slit goes vertically--this reduces sagging.
02-20-2013 12:22 PM
RobGallagher
Re: Head Backfill

My money is on the joker valve. Damn things stretch and no amount of acid will counteract that.
02-20-2013 11:55 AM
Pamojo
Re: Head Backfill

Hey! I'm going to to replace the joker/choker (really should be the gag valve) valve and raise the vented loops. We will see if that works.

Thanks!!
02-19-2013 08:53 PM
pdqaltair
Re: Head Backfill

Quote:
Originally Posted by Pamojo View Post
I hit the system with the muratic acid cleanse twice a year so it shouldn't be the joker valve. I don't know anything about it but it's not funny.
I hear that a lot--but it doesn't quite work that way. Unless you disassymbled the head, you don't know if all areas are clean. They also lose elasticity. There are chemicals that folks use that cause damage (PG, baby oil, Lysol, certain holding tank treatments including those with formaldahyde). If it is over 1 year old and you have these symptoms, it is very likely the problem or at least is dismissed as a cause at your peril. If the valves were all closed, where could water come from but the large diameter hose to the tank?

Conventional wisdom holds that "joker" is a bastardization of "choker," but who knows.
02-19-2013 07:01 PM
Faster
Re: Head Backfill

The loops probably need to go right up to the underdeck for proper protection.
02-19-2013 06:48 PM
Pamojo
Re: Head Backfill

There 2 anti siphon loops - 1 before the Electra San and 1 after. The system is under the v-berth forward and the loops come to the bottom of the berth. There is also a check valve after the macerator pump.

I hit the system with the muratic acid cleanse twice a year so it shouldn't be the joker valve. I don't know anything about it but it's not funny.

The flush is electric and runs for 30-45 seconds and leaves the bowl clean when done.

The head has overflowed in rough conditions - don't know whether it was just slosh or a lot of backfill. It did this with all the valves closed and the y valve diverting to the holding tank.
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