Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 02-06-2008, 17:30   #1
Registered User

Join Date: Apr 2006
Posts: 4,413
Dry bowl

I've recently completely rebuilt my Groco KH head, no old seals or rubber parts remain, everything has been totally cleaned and then the whole thing repainted. I've got a vented loop for the discharge

I've notice that with the sea cocks open water slowly seeps back into the bowl. This can only from two sources; the inlet water, or water come back passing the new joker valve. If I close the inlet seacock since water seeps in it must be the joker. Have I installed it incorrectly or perhaps over tightened or distorted it some how? I recall that this was not always the case in the past and the seeping seemed to be associated with a cruded up joker valve.

I don't think more than the water up to the vented loop can return to the bowl. Does anyone know why this is happening?
__________________

__________________
Sandero is offline   Reply With Quote
Old 02-06-2008, 17:43   #2
Moderator Emeritus
 
Pblais's Avatar

Join Date: Mar 2003
Location: Hayes, VA
Boat: Gozzard 36
Posts: 8,700
Images: 15
Send a message via Skype™ to Pblais
The joker valve it what lets water in and at the same time keeps it out. Assuming it's one of those heads that has a lever for dry and flush you need to be in the dry position such as when pump out the waste / water. Leaving the lever in wet / flush might let small amounts leak back in. If the seals are new they should do the job.

The vented loop will protect you from water siphoning into the boat and sinking. If you think about it if it didn't the failure of a stupid rubber flap could sink you. At most you would have just a little back flow from the water level of the loop in the head side of the vent. At worst the level in the bowl will rise to match that level. A long or higher than required loop could back flow more than a short one. If you flush with enough water you should never see waste coming back. that would be a vent problem in the loop. The vent in the loop and the tank both need to work properly else you can have problems. The vent in the loop lets air in and the vent in the tank lets gas (usually CO2) out.
__________________

__________________
Paul Blais
s/v Bright Eyes Gozzard 36
37 15.7 N 76 28.9 W
Pblais is offline   Reply With Quote
Old 02-06-2008, 17:48   #3
Moderator
 
cabo_sailor's Avatar

Cruisers Forum Supporter

Join Date: Mar 2008
Location: Tarpon Springs FL
Boat: Cabo Rico 38
Posts: 1,905
I can't say for certain on your Groco. On the Raritan there are two bolts that hold the flange that positions the joker valve. I had a noxious problem with the last bit in the waste hose slowly seeping back into the bowl. According to Peggy Hall, the "headmistress", if the bolts were overtightened they distorted the joker valve enough to let "water" seep back past the joker valve.

The last time I rebuilt the head I was extremely careful to alternately tighten each bolt as evenly as possible. Nor did I really torque them all that much. With many smiles, , I can report no back seepage.

Short of a whole new head which may or may not solve the problem (probably not), I can only report my own small success. Of course I dread the next time it is time to re-build and can only hope I do it right again. At the very least, in the case of my Raritan, I know what the problem is. According to Waldo in Robert Heinlein's novel, knowing the problem is 90% of the solution.
__________________
cabo_sailor is offline   Reply With Quote
Old 02-06-2008, 21:22   #4
Registered User

Join Date: Apr 2006
Posts: 4,413
I am not getting waste back in, but I could only determine that if I didn't do a through flush and left some black water in the effluent hose just down stream from the joker. Haven't done that. I suspect cabo may be on to something and the joker cab distort and allow bleeding back.

The problem is how to know how to tighten down the flange that holds it in place to NOT cause any distortion. If I assume it's over tightened, perhaps I need to slowly slack off the nut and see if the back flow problem abates.

It's definitely unrelated to the pump out lever since there is in no flush or dry bowl setting. I'll call Groco and see what those geniuses have to say.
__________________
Sandero is offline   Reply With Quote
Old 03-06-2008, 03:55   #5
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,573
Images: 240
Have you looked at the Groco “KH” Service Manual ?
Goto: Untitled Document

ie:
"Note: Once the bowl has been cleared, pump an additional 5 strokes to clear the toilet discharge arm and joker valve."
Attached Thumbnails
Click image for larger version

Name:	GROCOmodel-k-1-800.jpg
Views:	169
Size:	323.3 KB
ID:	3738  
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Dry Stores Ex-Calif Provisioning: Food & Drink 36 27-09-2008 06:44
Seacock = Wet/Dry???? alexleclainche Plumbing Systems and Fixtures 14 28-01-2008 11:52
Still in dry dock t30project Meets & Greets 2 07-11-2007 10:49
Dry Tortugas Curtis Atlantic & the Caribbean 5 17-03-2007 08:35
Dry Teak ScratchBC Construction, Maintenance & Refit 10 18-02-2006 23:31



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:00.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.