Shower won't drain

[Ron Hill]

pby : Look at my Mainsheet tech note article on adding a strainer in that drain line so it catches all the "junk" that causes the one way (anti-back flow) valve from getting clogged!!   

Trace your drain line from the pump motor and just before the pump will be that back flow prevention valve.  I just added a small strainer and replaced that valve.  That new valve ended the back flow problems and the new strainer prevented that valve from getting clogged.  You'll be surprised how much junk that strainer catches!!

I see you have a MK II so the pump/strainer is under the galley sink!!  I'll guess that there is a one way valve somewhere? in that drain system.

A few thoughts

[pbyrne]

pby : Look at my Mainsheet tech note article on adding a strainer in that drain line so it catches all the "junk" that causes the one way (anti-back flow) valve from getting clogged!!   

Trace your drain line from the pump motor and just before the pump will be that back flow prevention valve.  I just added a small strainer and replaced that valve.  That new valve ended the back flow problems and the new strainer prevented that valve from getting clogged.  You'll be surprised how much junk that strainer catches!!

Read the article!!!  A few thoughts

Is that for a MKII?  I ask as my strainer is under the sink, and you're right it catches all sorts of stuff.  I don't think I noticed a valve though...

[Jim Hardesty]

Is that for a MKII?  I ask as my strainer is under the sink, and you're right it catches all sorts of stuff.  I don't think I noticed a valve though...

On Shamrock a 2001 MKll there's a couple of valves leading to that strainer/pump.  One drains the shower the other drains the refrigerator box.
Jim

[pbyrne]

Is that for a MKII?  I ask as my strainer is under the sink, and you're right it catches all sorts of stuff.  I don't think I noticed a valve though...

On Shamrock a 2001 MKll there's a couple of valves leading to that strainer/pump.  One drains the shower the other drains the refrigerator box.
Jim

Same here. 

[Ron Hill]

pby : Refer to your MK II Owners Manual and you will find a page marked PLUMBING PLAN (not numbered in my copy). 
It shows that the drain line from the shower drain comes in (under the galley sink) from the aft and the fridge drain come in from the bow side and they join into a FILTER just before the sump pump!!!   

You may or my not have a separate back flow valve?  If not that function may be incorporated in the filter and /or the pump??/

A few thoughts

[Noah]

The MK1s have/had a foot pump in the galley to pump fridge drain. Since I have refrigeration and don't use block ice for cooling, I removed my pump and plugged the drain hole in the fridge. I just sponge out the little water I get in tge bottom after defrosting.

[Pete G]

Below is what I found under the head sink.  I used a multimeter on the shower bilge switch and it doesn't appear to be getting a current through the lines.  I turned on the power to everything, and flipping the switch didn't turn it on.  The unconnected hose connects to the toilet.  Pumping the toilet doesn't draw in water, so I may have found 2 problems.  Adding a t-valve, tracing the electrical issue. 

[mark_53]

I had to turn the bilge pump on at the panel before the head shower switch.  Both needed to be on to operate.

[robbjd]

I don't see a handle on the through hull. If you don't have a valve to close this through hull you have a few things to worry about.

[Ron Hill]

Guys : The head shower pump switch SHOULD be wired into the water pressure pump circuit!!

A thought

[Pete G]

I don't see a handle on the through hull. If you don't have a valve to close this through hull you have a few things to worry about.

It's there, just doesn't show in the photo.

[Roland Gendreau]

Did you test the shower sump pump switch?   Mine failed a few years ago.

[KWKloeber]

Below is what I found under the head sink. 

That photo appears to be a disaster waiting to happen. 
Is that a Schedule 40 PVC tee (PVC is not allowed below waterline)???   
And is that an NPT-thread Tee screwed onto an NPS-thread thru hull??  That's a HUGE dangerous no-no.

[Pete G]

I have the through hull closed both because of the PVC and the toilet not being connected.  It's at the top of the maintenance list, believe me.

[robertr0816]

I Just learned that my electric shower drain pump doesnt work. Mines is nice and hidden under the Head sink. It is an original giant diaphragm and all.
What pump would be a good replacement? I am guessing it would need to be beefy since is pumping into that fresh water thru hole.
Also notice that that the sink is piped directly to a thru hole, has a ball valve, but that doesnt seem right. am i missing something?
MK1 1988