Thanks for the advise Peggie. More comments below.

Doug
s/v Callista

"Peggie Hall" wrote in message
...
Doug Dotson wrote:
I guess you meant Joker Valve.

No...I meant downstream of the whole toilet.

Actually, I was referring to the term "Choker Valve".

The only thing that could do that is the vented loops.

Nope...they're the least likely candidate...worst case in a vented loop
is, it becomes just a loop, unvented.

I've checked both the vents in the loops. They are fine.

Likely possibilities are sea water calcium carbonate buildup in the head
discharge line (did you take a look inside when you had it off to
rebuild the toilet?)

Yes, no serious buildup.

or a partial clog created by something that
shouldn't have been flushed--which can be in the line,

You mean other than doodoo, peepee, and TP? Nope.

or in the L/S if
you've flushed solids or TP without running it

Just reinstalled the L/S after being sent back to Raritan and rebuilt.

...or a barnacle may have
attached itself to the discharge thru-hull, preventing the L/S from
discharging.

That would have to be one mother of a barnacle Anyway, all
throughhulls were checked and serviced before we launched.

Whatever it is, look downstream of the whole toilet...'cuz backup into
the bowl can only mean one thing: something downstream of the toilet is
creating backpressure that won't allow the flush to pass. The longer it
takes for the backup to appear in the bowl, the further downstream of
the toilet it's likely to be.

Well, I'll start working through the system. I'll try switching the Y valve
to the holding tank as a start. Should at least isolate the problem.


--
Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://69.20.93.241/store/customer/p...40&cat=&page=1