[C320-list] Fwd: Re: Shower drain pump problem

[Rick Evans]

I agree that's exactly what I did. Thanks for the info I will go get one asap. 
Sent via BlackBerry from T-Mobile

-----Original Message-----
From: Scott Thompson <surprise at thompson87.com>

Date: Mon, 27 Jul 2009 10:30:40 
To: <C320-List at Catalina320.com>
Subject: Re: [C320-list] Fwd: Re:  Shower drain pump problem


You probably damaged the duckbill valve in the anti-siphon loop when you 
ran the pump with the through hull closed.  That is what that "popping" 
noise was when you started the pump.  Someone else reported the exact 
same experience earlier this year.

Once it's blown it's going to leak whenever you run the shower sump 
pump, whether it's to drain the ice box or the shower sump.  You can buy 
a replacement cap assembly, which includes the duckbill valve, at West 
Marine.  It's made by Forespar.

And yes, the duckbill valve is part of the screw off cap of the plastic 
"U", which is your anti-siphon loop.  The purpose of this device is to 
close whenever pressure exists in the circuit, but also to let air into 
the hose if suction ever develops, which could cause water to start 
siphoning from the thru-hull into the boat.  However the rubber valve 
can only withstand so much pressure before it fails, which probably is 
what happened in your case.  And once it fails, it no longer can close 
to keep water from leaking out of the hose under pressure.

There is a second anti-siphon loop for the head intake in the same 
locker, and a third one in the port cockpit locker that is for the 
engine cooling raw water circuit. But since there is no way to close the 
outlet for either of those circuits, you are unlikely to ever blow the 
valve except on the one for the shower sump.

Scott Thompson


Rick Evans wrote:
> Karl
> 
> Thanks. 
> 
> Where is the duckbill valve?  Is it in the plastic U?
> 
> I did have the through hull closed but opened it when the problem occurred but it didn't help. Although I never knew it had multiple positions. I will get it there and look again. 
> 
> Thanks
> Rick 
> Sent via BlackBerry from T-Mobile
> 
> -----Original Message-----
> From: "Karl Mielenhausen _/)" <c320 at suddenlink.net>
> 
> Date: Sat, 25 Jul 2009 21:50:27 
> To: C320IA Discussion List<C320-List at catalina320.com>
> Subject: [C320-list] Fwd: Re:  Shower drain pump problem
> 
> 
> Jeff is correct, but you may also have a problem with the antisiphon loop  
> for the shower drain line.
> 
> The duckbill valve inside it is designed to relieve vacuum, not to open  
> with pressure.
> Open it up and make sure
> a. the duckbill portion is indeed there
> b. the "lips' are pointing down, away from the cap
> c. the hole in the cap is not restricted
> 
> We have 3 of these antisiphons on the boat and they each should be checked  
> annually.
> More info is here...
> http://www.catalina320.com/article.php/20090227142548598
> 
> Karl
> 
> ------- Forwarded message -------
> From: "Jeff Hare" <catalina at thehares.com>
> To: C320-List at catalina320.com
> Cc:
> Subject: Re: [C320-list] Shower drain pump problem
> Date: Sat, 25 Jul 2009 21:40:53 -0400
> 
> Rick,  this happens when the shower sump thru hull is not open when you
> run the pump.
> 
> If you have a "Y" valve under the head sink then one position is fridge
> and the other is shower.
> 
> - JeffH
> ------Original Message------
> From: Rick Evans
> Sender: c320-list-bounces at lists.catalina320.com
> To: C320-List at Catalina320.com
> ReplyTo: C320-List at Catalina320.com
> Subject: [C320-list] Shower drain pump problem
> Sent: Jul 25, 2009 8:42 PM
> 
> 2 things
> 
> 1. Is it true the shower drain pump is used to pump out the ice box?
> 
> 2. Today when I turned the shower pump on to drain the icebox today I
> heard a sound like air popping in the head. I opened the door and there
> was water coming from the VENT hose on behind the head in the cabinet.
> 
> Anyone have any idea what the problem is?
> 
> Thanks
> Rick
> #724
> Sent via BlackBerry from T-Mobile
> 
> 
> 

-- 
Scott Thompson
Surprise, #653