SailNet Community banner

1 - 15 of 15 Posts

·
Registered
Joined
·
1,479 Posts
Discussion Starter · #1 · (Edited)
I'm not getting raw water supply to my Jabsco head. I'm guessing the intake is plugged. I dove the boat and stuck a coat hanger into the through hull, no luck.

Maybe blow it out (technically...in) with compressed air or water?
Ideas?

Could anything else be causing this? I didn't think so, as it seems to be naturally pressure fed. Normally, open the valves and the bowl starts filling. Close the valve and it stops. Fail to close the valves and sink the boat!
(And I'm ready for the jokes!:))
 

·
Registered
Joined
·
2,433 Posts
Check to see if you have a one way (ball with spring) check valve installed in your intake line, commonly used, the ball may be sticking.
 

·
Superior Sailor
Joined
·
1,032 Posts
I have a similar but different problem on my Jabsco head...

I "loose" the prime on the RW intake and have to pull the line to bowl off, put my finger over the pump hole and pull release, pull release to get water up to pump...then it will work fine for awhile...till it looses prime again...

Sounds like this "check valve" is leaking back, but not so sure I have one in line from the RW intake thru hull..
 

·
Registered
Joined
·
1,036 Posts
I'm not getting raw water supply to my Jabsco head. I'm guessing the intake is plugged. I dove the boat and stuck a coat hanger into the through hull, no luck.

Maybe blow it out (technically...in) with compressed air or water?
Ideas?

Could anything else be causing this? I didn't think so, as it seems to be naturally pressure fed. Normally, open the valves and the bowl starts filling. Close the valve and it stops. Fail to close the valves and sink the boat!
(And I'm ready for the jokes!:))
1. Close seacock
2. Disconnect hose from seacock
3. Open seacock slowly
Water?
Rushing in or small drip?

If water intake is OK check hose between seacock and toilet pump.

If your toilet normally fills with water when seacock is open you should install a anti siphon valve..
 

·
Registered
Joined
·
1,036 Posts
I have a similar but different problem on my Jabsco head...

I "loose" the prime on the RW intake and have to pull the line to bowl off, put my finger over the pump hole and pull release, pull release to get water up to pump...then it will work fine for awhile...till it looses prime again...

Sounds like this "check valve" is leaking back, but not so sure I have one in line from the RW intake thru hull..
When did you service the pump :)?
 

·
Registered
Corsair 24
Joined
·
4,594 Posts
I would replace what they call a joker valve inside the pump...

it will lose "suction" if the diaphragm part doesnt have a good enough seal

also like above visually check to see flow of water from the thru hull

peace
 

·
Registered
Corsair 24
Joined
·
4,594 Posts
The joker valve is on the outlet side of the pump, it prevents the dirty water from running back into the bowl :)
its the language thing...on another thread somoen reffered to this as the actual pump diaphragm

my bad then

on the jabsco pumps you want to replace the diagphragm, and spring or else the pump wont action correctly

does that make sense?

sorry for the confusion
 

·
Registered
Corsair 24
Joined
·
4,594 Posts

·
Registered
Joined
·
1,036 Posts
its the language thing...on another thread somoen reffered to this as the actual pump diaphragm

my bad then

on the jabsco pumps you want to replace the diagphragm, and spring or else the pump wont action correctly

does that make sense?

sorry for the confusion
I have always wondered why it's called a joker valve :)
Found this article (It does not explain the name, but worth a read) Joker Valves for Marine Heads - Practical Sailor Article

Edit: Found this
:)
Seems joker valve is the Jabsco adaption of a Duckbill valve
 

·
Registered
Corsair 24
Joined
·
4,594 Posts
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

that makes sense

in any case apply video 1 op and see if that is the issue if not apply other vids

sorry for the slight hijack

the reason Im saying this is we just did this on an exact same jabsco head that was left sitting for 4 years

the spring failed and the gasket leaked...

once fixed and inspecting flow of water all was good

works great
 

·
Wish I never found SN!
Joined
·
2,116 Posts
Had a similar problem. Unscrewed the inlet strainer and it was clean opened the stop valve and water gushed in. It was only when I completely removed the strainer assembly that I found a long length of weed with lots of leaves on it. What was happening was it would compress and plug the line when I stopped pumping it would uncompress and allow water to flow. Do the simple things first and work your way towards the complicated expensive stuff.
 

·
Superior Sailor
Joined
·
1,032 Posts
Thanks for the videos.... I have the parts kit and after watching the video am ready to attack the pump
 
1 - 15 of 15 Posts
Top