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Old 10-05-2012, 15:21   #1
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jabsco joker valve an annual replacement?

Back flow yet again. Changed flapper and joker less than a year ago....normal time to fail? am I missing something?
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Old 10-05-2012, 15:38   #2
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Re: jabsco joker valve an annual replacement?

nope that the same here and becoming an expert quickly LOL

Did it yesterday
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Old 10-05-2012, 16:08   #3
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Re: jabsco joker valve an annual replacement?

Yep, the jokers at least seem to fail pretty rapidly, and they tend to be pretty dear from Jabsco . So, yesterday I replaced mine with one from the knock-off TNC head folks... way less expensive and essentially identical to the eye. Works fine now, and I'll be interested to see if it lasts at least as long as the OEM parts. If I get premature (or really, MORE premature) failure, I will report here on CF.

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Old 10-05-2012, 16:11   #4
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Re: jabsco joker valve an annual replacement?

I live aboard, and change it every couple of months.

who is "knock-off TNC head folks"?
Tom
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Old 10-05-2012, 16:18   #5
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Yep, about $15 from WM...flapper failing at same rate, or do jokers go first, with the joke on us? Pun intended.
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Old 10-05-2012, 16:43   #6
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Re: jabsco joker valve an annual replacement?

I did both or heads yesterday as well. Main problem was the Joker valve with a big build up of calcium. (using hydrochloric acid does help a lot to get rid of some of it)
Both less than a year old.

Why are they called "Joker Valves?
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Old 10-05-2012, 18:16   #7
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I believe it really is a "choker valve" but Joker became the oft used name...maybe because the joke's on us...should last longer than a few months...but, rather replace the joker and flapper than have back flow, and don't feel like a major refit to replace the head with something more substantial.
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Old 10-05-2012, 18:49   #8
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Re: jabsco joker valve an annual replacement?

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Originally Posted by teejayevans View Post
I live aboard, and change it every couple of months.

who is "knock-off TNC head folks"?
Tom
Sorry 'bout that: should have been TMC

tmcin.com/about-us.aspx

They seem to copy many of Jabsco's products and sell them here in Oz for about half Jabsco prices, more or less.

And my first product review comment is that after a day's usage it started leaking at the flange. A quick recheck showed that the thickness of the rubber flange on the joker was a bit thinner than the Jabsco one. Not being near a chandlery right now, I have glued a shim of 2 mm rubber on the flange, and the leak has stopped... for now.

Being a cheapskate has its drawbacks!

Cheers,

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Old 10-05-2012, 19:14   #9
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Re: jabsco joker valve an annual replacement?

Six years ago, I unbolted both my Jabsco heads from the deck and put them where they belonged............the dumpster. I replaced them with Raritan units and have the original joker valves in them. We live aboard for 8 months of the year.
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Old 10-05-2012, 19:29   #10
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Jentine says it best!
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Old 10-05-2012, 19:31   #11
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Re: jabsco joker valve an annual replacement?

I believe, though I haven't collected numerical data, that there is a relationship between the salinity of the water and the rate of crusty deposition on the joker valve. Mine last longer when I am further upstream within an estuary. I also believe that a dollop of vinegar (acetic acid) in the bowl slows this deposition. This is a much milder acid than the HCl mentioned above, but it still breaks down the scale.
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Old 10-05-2012, 19:57   #12
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Re: jabsco joker valve an annual replacement?

Can't resist a reply . Lived aboard 5 years never replaced anything on either Jabsco head. Pour cooking oil in once a week and every so often half a litre of cheap vinager. Also have a sign " if you didn't eat it don't put it here"
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Old 10-05-2012, 20:02   #13
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Our jabsco electric is going on 3 years since new joker. Starting to see occasional seepage, but I think it is from crusty TP, I can clear it and stop the seepage.
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Old 10-05-2012, 20:14   #14
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Re: jabsco joker valve an annual replacement?

Quote:
Originally Posted by malukusailor View Post
never replaced anything on either Jabsco head. Pour cooking oil in once a week and every so often half a litre of cheap vinager.
Interesting...thanks malukusailor.

We haven't any problems yet, apart from our 'guest heads' being blocked by gravity back-flow (essentially not continuing the flush action long enough to pump the matter all the way into the tanks) against the joker valves. In the process of cleaning the blockages we observed the joker valves to be still flexible, albeit filled from behind with the blockage of course.

We also saw it suggested elsewhere to fill the heads with fresh water if they're not going to be used for a while, which we now do.

We might now add the cooking oil and vinegar as further preventative maintenance...
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Old 11-05-2012, 00:02   #15
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Anyone have an exploded view of the small pot manual Jabsco? Grey handle 2007 model?

Googled a bit and can't come up with one yet.
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