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Forward Holding Tank - 470

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Idratherbesailing View Drop Down
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    Posted: 04 November 2019 at 11:52
Trying to diagnose a fwd manual Jabsco not pumping problem...
  1. Pump handle became stiff and stuck up.
  2. Have taken it all apart and checked the operation of the top valves, seem ok.  They are relatively new this season. 
  3. Replaced the joker valve, it was also not old but had become distorted with the pressure I guess. 
  4. Put it all back together and it pumps for a while before freezing up again. 
  5. So I am thinking blockage. Great :/  We do use small amounts of special boat paper - if that's not too much information!  Weekend sailors and usually flush through with some vinegar before leaving the boat. 
  6. Holding tank is empty.  Give it a good flush with a hose pipe from the deck plate - no issues.
  7. Close of the outlet valve, fill holding tank, release - empties quickly and with no fuss. Do this a couple of times because I am thinking a nice clean tank might be a good starting point.
  8. All the while, the toilet is disconnected from the soil pipe to the tank and the joker valve is not in place.
  9. Close the outlet valve, fill tank and try and make a seal around the hose pipe with hand over the breather hole to build up some pressure.  Certainly got some pressure going.
  10. So, I am surprised while doing the above there is not something messy going on back at the other end of the pipe by the toilet, unless of course it is this which is blocked and really properly blocked. 
  11. Looking at the holding tank, both the in and out pipes enter the tank at the bottom.
Question 1 - is it really as simple as that?  The in pipe goes into the floor of the tank and stops?  Or is there an up-stand inside the tank to raise the point at which the dirty water enters the tank?  It seems that without something like that one is asking a lot of a joker value to hold back a 3-4 ft head of pressure if the holding tank is full.

Question 2 - There aren't any other valves in this part of the system are there?

My next planned action - Insert a long & bendy wire drain unblocking thing from the toilet end and attempt to push up to into the tank. 

Question 3 - Any other suggestions for things to try or possible problems/solutions. 

By the way - I have tried the "she who breaks it fixes it" strategy, but that has failed, although to be fair she's been good at passing kitchen roll, clean clothes and looking guilty. 

Thanks! 

gpw
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Wild View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wild Quote  Post ReplyReply Direct Link To This Post Posted: 04 November 2019 at 14:04
hello
this are the solutions I fond for the problems with the very (to) small holding tanks.
1) where the inlet tube connect to the tank the diameter is verry small and easy blocked.
2) the Vetus ventilationcap in the hull used by Hanse have a SS filter inside (Why hanse let then inside ???)  every time the tank get full to overflowing this filter get blocked. Throw away this filter.
one or both of this will lead to the problem you describe.
hope this will help you
Wild and Wet
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Idratherbesailing View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Idratherbesailing Quote  Post ReplyReply Direct Link To This Post Posted: 04 November 2019 at 14:21
Thank you sir!

The diagram is very useful to understand the construction and the points you make are very helpful. 

At this stage I know the breather filter is not blocked, so I will leave that for now and take your advice on removing this if I have to.

I will continue my plan to try to rod the inlet pipe from below. If that does not work I guess I will try to detach it at the connection to the tank (which is in a very awkward position!). 

Last resort, remove whole tank.... 

Thanks for your help. 

gpw
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wild Quote  Post ReplyReply Direct Link To This Post Posted: 04 November 2019 at 14:32
just for information
once a year we take out the whole complete system :toilet tank and all the hoses to clean.
once you find out how to do this it is easy to do in 30min.
Wild and Wet
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Idratherbesailing View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Idratherbesailing Quote  Post ReplyReply Direct Link To This Post Posted: 04 November 2019 at 14:34
Impressive! Thanks. 
gpw
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wild Quote  Post ReplyReply Direct Link To This Post Posted: 04 November 2019 at 16:16
I mean 30 min to build it out SorryConfused
Wild and Wet
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