List: trawlers@lists.trawlering.com
From: Scott H.E. Welch
Re: T&T: Another Vacuflush problem
Tue, Aug 12, 2008 2:41 PM
Henry Dennig writes:
>Our trawler has 3 vacuflush heads. All three keep running.
Hey Henry,
The good news is that Vacuflush technology is very simple, and you can have
this tracked down in a few minutes. There are three possible causes:
First, the seal:
The best troubleshooting advice is to see whether the bowl is dry. If it's
dry, the leak is in the ball valve at the bottom of the toilet. In almost
every case where my pumps have cycled, this has been the culprit. If the bowl
still has water, the leak is downstream of the ball valve.
Notwithstanding the cleaning tool from Sealand, the best results I have had
cleaning a leaky ball valve are when I hold the ball valve open with my foot,
and then clean carefully all the way around the inside of the rubber gasket.
I just use paper towel and Sunlight. YOU DO NOT WANT A NICK IN THE SEAL!
Second, the switch:
Sometimes the pump will not start when it was supposed to, and sometimes it
would run on. After watching the tank carefully I realized that there was a
shaft which connected to the vacuum switch bellows and operated a
microswitch. The shaft has gotten a bit dirty and dusty, and was binding
against the sleeve. This is very easy to test -- just gently nudge the shaft.
Anyhow, a quick spray of WD-40 had it running perfectly.
Third, a leak somewhere else:
You may have a leak somewhere else. This is extremely unlikely, but possible.
You will know if this is the case because the pump will be cycling but there
will still be water in the bowl. You best tools are your ears. Let the vacuum
build up and then listen carefully for where the hissing sound comes from.
Finally, my own advice:
I read once long ago that vinegar was good for cleaning heads. And I used to
work in a lab and we had a oily sort of lubricant that we used for O-rings
and other rubber seals. So, I got to thinking that a nice emulsion of vinegar
and vegetable oil would be good to clean and lubricate the rubber parts in my
heads. Fortunately Kraft makes a product that contains exactly these
ingredients and best of all bottle costs about $1.29 in the salad dressing
aisle at your local supermarket. So after cleaning the ball valve I go to the
fridge, find the oldest bottle of salad dressing I have, and pour about a
cupful into the head. Work the ball valve open and closed about 10 times. So
far (5 years) the results have been perfect.
Scott Welch
FirstClass Product Manager
www.firstclass.com
Those who make no mistakes rarely make anything.