Need Help with Finding Y-Valve '93 DB

A

an86carrera

New Member
Jan 28, 2010
10
Bradenton, FL
Boat Info
1993 370DB
Sedan Bridge
17' Montauk
Engines
454 straight drive inboards
E-TEC 90
Need Help with Finding Y-Valve '93 370 DB

I can not find the Y-Valve on the black water system. I have tried to pump out the boat, pump works but never empties. I have had other boats that had y-valve to be opened but can not find one in the system, any knowledge here?
Thanks
Len
 
Last edited:
Len, I have a '94 370 EC with a similar issue. I found that I do not have a y-valve, just a fitting coming out of the holding tank that directs a line up to the deck for pumpout and to a hose leading to the macerator. I have to open the seacock to pump out, but the hose from the tank to the macerator is apparently clogged and does not work. Because there is no valve, and the hose is at the lowest point in the sytem, any solids will settle in the hose first. I have NEVER seen a boat plumbed this way, without a y-valve or any type of valve between the holding tank and the macerator. I will use a pump out station until I get the guts to replace the hose leading to the macerator, and with a valve installed.
 
Sea Ray did not normally install a Y-valve.

If your boat has a discharge pump, then you must first open the sea cock where the hose on the outlet end of the discharge pump terminates, usually thru the bottom of the hull to evacuate the holding tank.

This same sea cock must be closed when you have your holding tank pumped out at a dockside pump out station. If you leave it open, the shore side pump out will apply so much vacuum that it will cause the rubber duckbill valves in the discharge pump to reverse. When they are inside out, the discharge pump cannot generate any vacuum, so you will hear the pump run, but it will not pull waste from the tank and discharge it.

So, for the second poster above, if you can pump out at a dock side pump out station, you probably don't have a blockage and your line isn't clogged. To fix the duckbills, take the boat to a pump out station and have the holding tank emptied....fill with fresh water a couple of times and pump the tank dry. Then, close the seacock, clip the wire splices on the discharge pump and remove any tie downs for the hose near the pump. Then remove the base screws mounting the pump and then raise the pump to and secure it at an elevation in the bilge higher than the holding tank. Now you can remove the pump from the line, take it off the boat and disassemble the ends to access the duckbill valves.
 
Thanks, I will get it pumped this weekend and see about checking the duckbills.

Len
 
Thanks Frank. That might be the problem, since the pump runds, but does not discharge anything. The PO was not knowledgeable about those things at all and might have left the sea cock open while pumping out.
 
Frank

Is it important (as described above) on all Sea Rays that are fitted with a Macerator, to have the overboard discharge valve closed when using a shore based pump out station?

Thanks

Graham
 
That depends upon the plumbing on the individual boat and whether you have a SeaLand discharge pump or if you have a mascerator.

Follow your discharge plumbing and if if you have a SeaLand pump and if there is no way to isolate the discharge pump from the pump out line during a dockside pump out. If there isn't, then yes, you need to close the seacock.

I have put a ball valve ahead of my discharge pump to make pump outs easier and to facilitate removing the discharge pump for service when needed and to avoid a mess in the boat.

I'm pretty cautious with my discharge pump and system.........I really don't like taking that system apart because I always seem to screw up and make a mess.
 
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