Jabsco toilet issue after service

In another thread I extolled the advantages of using fresh water flushing and dispensing with the sea water intake altogether. No smell, no organisms dying in the anaerobic intake pipe, no risk of anything passing from one side of the pump to the other, less risk of scaling up through the action of urea on sea water minerals and life forms.
 
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garymalmgren said:
but in some marinas this can change with the tide and we learned to be careful to wait some time between pumping out and flushing to avoid unpleasant recirculating.

You pump out in a marina?
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It is in a tidal river the tide runs through quite fast at times, and, no we don’t as a rule, but sometimes circumstances make it unavoidable.
 
Leighb said:
Where are the inlet and outlet in the hull? On our previous boat the inlet was only about 2 ft ahead of the outlet. No problem if the current under the boat was “normal” I.e. from bow to stern, but in some marinas this can change with the tide and we learned to be careful to wait some time between pumping out and flushing to avoid unpleasant recirculating.
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Flushing out directly in a marina is not considered to be the done thing, on a number of grounds, sanitation and aesthetics being the principal ones. Using the facilities ,or a holding tank, is preferred.
 
Catalina36 said:
In another thread I extolled the advantages of using fresh water flushing and dispensing with the sea water intake altogether.
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I have extolled such benefits, too, but sadly my bank manager was unpersuaded, and unwilling to fund a boat big enough to have the requisite sized water tanks, and the marina berth with water on tap to easily keep them topped up. ;)
 
Having just fitted a maintenance kit to the twist and lock assembly I would suspect that the flap valve at the bottom of the assembly is the wrong way up.
Yes Catalina is correct although the pegs are very short .One way or another there has been a misassembly of the top or bottom flap valves ,the internal switch lever or the joker valve - you have to look closely at the very small diagram - there are very few components and I can't see that anything of size can pass the piston.The joker is a strong candidate because anything such as a small screw even or some scale can hold it partially open. and ineffective.
 
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bluerm166 said:
Having just fitted a maintenance kit to the twist and lock assembly I would suspect that the flap valve at the bottom of the assembly is the wrong way up.
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I fitted a new pump assembly a couple of months ago and my recollection is that the three holes in the flap valve and the three pegs on which they fit make it impossible to get it upside down or back to front.
 
Well I didn't study the flap valve ,except to work out which way round it had to be ,but presumably if it were the wrong way round it wouldn't act as a shutoff in the desired direction.
 
bluerm166 said:
Well I didn't study the flap valve ,except to work out which way round it had to be ,but presumably if it were the wrong way round it wouldn't act as a shutoff in the desired direction.
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Even if it can be installed upside down it wouldn't cause the problem described by the OP.
 
pvb said:
Even if it can be installed upside down it wouldn't cause the problem described by the OP.
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I was really careful to follow the instructions but I must have put something back incorrectly. The joker valve at the bottom has the 3 short pegs , can it be in incorrectly? Surely the waste must be passing at the top stroke of the pump and hence the issue is at the top valve? I can’t see it getting past the piston o ring?
 
As already said you are pumping back in what you have just pumped out,nothing to do with o rings ,flap valves etc if the outlet is close to the inlet thats what happens.
 
Jeanneau Chris said:
I was really careful to follow the instructions but I must have put something back incorrectly. The joker valve at the bottom has the 3 short pegs , can it be in incorrectly? Surely the waste must be passing at the top stroke of the pump and hence the issue is at the top valve? I can’t see it getting past the piston o ring?
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I don't think you've put anything back incorrectly; I suspect that Leighb identified the problem in post 9 - you're probably sucking in the stuff going out because the seacocks are close together.

The joker valve has nothing to do with this problem, and it's pretty well impossible to install it incorrectly.
 
pvb said:
I don't think you've put anything back incorrectly; I suspect that Leighb identified the problem in post 9 - you're probably sucking in the stuff going out because the seacocks are close together.

The joker valve has nothing to do with this problem, and it's pretty well impossible to install it incorrectly.
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I will have a look at that theory, however if I remember correctly it happened very quickly after pumping, and there is quite a bit of pip work and a holding tank for the objects to pass through before being sucked back in
 
In a small head compartment the inlet and the outlet thro hull will typically be within 2 feet of each other ,as are ours,and we have not had this problem,although in a confined space it is not impossible.In a strong tide the material would be distributed rapidly and probably before fresh water was taken in.The situation would be more challenging if the outlets are one above the other and as close as some shown on Jabsco diagrams.
The plunger has an O ring of 5 dia. cross section so even without the ring in place (and its part of the kit) the maximum gap on one side would not exceeed 5 to 6mm.
Perhaps an analysis of the imported debris would confirm or rule out this route.
In the past bananas have been used to detrmine the correct flow in manhole benching and drains so might be employed for further test purposes here.
 
Another thought : since the external black lever switches between input and discharge is it possible that either the twin top valve itself or the black internal lever are displaced so as to allow input and discharge at exactly the same time ? The length of the discharge pipework and volume of the tank are not necessarily a barrier to external mixing since they will already have contents similar to the fresh contribution.
 
bluerm166 said:
Another thought : since the external black lever switches between input and discharge is it possible that either the twin top valve itself or the black internal lever are displaced so as to allow input and discharge at exactly the same time ?
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All the black lever does is disable the inlet suction, so no flushing occurs. It wouldn't cause the problem the OP described.
 
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