Blakes style thourhg hull - back to front?

dylanwinter

dylanwinter

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Blakes style through hull - back to front?

Harmony has Blakes style seacocks on the bog

one was seized. I removed, cleaned and greased.

it is the inlet

the bog empties but does not fill

have I put the valve back in wrong in some way

could I have put it in 180 degrees wrong?

D
 
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You might have the handle on the wrong way in relation to the hole in the cone. Take the hose off and turn the handle so you can see which way is open and which is closed.

ps close it quick when water comes in!
 
There should be an arrow moulded into the top of the cone, inside the square that the handle fits around. This arrow points to the hole. For the "open" position, the arrow should be pointing at the hose. This may not be where you expect if you have put the handle on differently to where it was before.

Pete
 
You can check it while in the water as I described and if you need to reposition it then bit less messy done while dried out! Good opportunity to test whether your wooden bungs work. If you are quick and have the bung ready, very little water will come in - no more than when taking a log impeller out to clean it.
 
dylanwinter said:
Harmony has Blakes style seacocks on the bog

one was seized. I removed, cleaned and greased.

it is the inlet

the bog empties but does not fill

have I put the valve back in wrong in some way

could I have put it in 180 degrees wrong?

D
Click to expand...

Is this a new problem since fiddling with the seacock, or was the seacock stuck closed so you never tried the bog before? Jabsco type bogs often have the problem of pumping out but not in. This is caused by the flappy rubber valve bit with a weight on it in the bog pump being left with the lever switched to bog dry mode. This bit of rubber remembers its shape and then doesn't seal on its hole when moving the lever the other way. First thing to try is move the lever to pump in mode and leave it for a day. Sometimes the rubber flap reverts to its rightful shape and then pumping in works again. Often takes some vigorous pumping to get it to start.
 
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Exactly the same problem after I had mine out of the water.. I'm told the seawater in pipe is empty and the inwards valve seals not good enough to overcome a 'dry' pipe. I haven't tried the solution yet but apparently it is to fill the bowl completely and pump like a good 'un.
I'm hopefully at the boat this weekend and will give it a go and report.

Hoping it works.. 2 blokes aboard for a 2 week delivery trip involving a pub or two soon.

NB - fill the bowl with fresh or sea water
 
SteveTibbetts said:
I haven't tried the solution yet but apparently it is to fill the bowl completely and pump like a good 'un. ........... NB - fill the bowl with fresh or sea water
Click to expand...

No reason at all why that will work. The suction and discharge sides of a toilet pump are completely separate. Diagrams at http://coxengineering.sharepoint.com/Pages/Toilets.aspx The faulty valve(s) are above any water level that you can get in the bowl. Priming the suction hose just might work but as written above the problem is that one or both rubber flaps are not seating properly.
 
I had a similar priming problem with a Jabsco. As already said, the flap valve needs to be cleaned and reseated (I gave it a rub with some cooking oil too, to help it along). Still couldn't pump anything in until I unclipped the anti syphon loop and laid it on the sole to reduce the head I was pumping against - success! Once primed, it's been fine.

Rob
P.S. Cooking oil gets used far more for lubrication of random objects than frying on my boat - too much day sailing.
 
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