Also check the vent hose isn't blocked and causing pressure in the tank and forcing the stuff back to the head
Paul. :) On 2012-09-13, at 8:50 AM, honeys...@aol.com wrote: > Check the rubber joker valve in the discharge side of the pump...Same > problem, different make of head (Groco) and the joker valve was the culprit.. > > Jack Fitzgerald > HONEY > C&C 39 TM > Savannah, GA > > In a message dated 9/13/2012 8:47:18 A.M. Eastern Daylight Time, > mike.h...@impgroup.com writes: > Steve > > We have had a similar problem on the 115 - also a Jabsco manual flush > head. In our case the water was backflowing from the discharge hose > into the bowl. Our solution was to over pump for approx 20 seconds on > wet flush before pumping on dry flush. That way the backflow would at > least be cleaner water! > > Mike > > -----Original Message----- > From: cnc-list-boun...@cnc-list.com > [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of OldSteveH > Sent: Thursday, September 13, 2012 1:00 AM > To: cnc-list@cnc-list.com > Subject: Stus-List Head Trouble > > I've had this disgusting problem a few times and attributed it to > someone > over-flushing the head, but I think there's a problem with the head: > > After a few days post-pump-out the head has back filled with blackwater > while sailing and once while at anchor. > First few times this happened I chalked it up to a guest over-flushing, > got > it pumped and went on my way. > > The Jabsco head is 3 years old. The system was completely redone by > previous > owner. > It was a very well done job, no mickey mouse stuff on the surface, all > new > hoses and recommissioned blackwater tank. > I checked the Jabsco manual and all appears to be piped correctly. > > The last trip was the last straw. I had to go below every 10 minutes and > scoop some very disgusting water out of the bowl and pour down sink > drain > otherwise it would have overflowed. After a couple of hours of this the > shine wears off, believe me. > > So - my plan is to take out the pump/valve assembly and look for a > failed > seal. > Should the head discharge hose-to-tank have a check valve in it? I think > not > because it would become fouled with solids. > I'm aware of principles of siphoning but short of drawing a diagram I > don't > think siphoning is the problem. > I can't think of anything besides a failed seal. > > Help! > > > Steve Hood > S/V Diamond Girl > C&C 34 > Lions Head ON > > > > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com
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