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10-25-2020, 04:37 PM
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#1
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Ensign
Join Date: Oct 2020
Posts: 7
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Black water discharge?
I just got a 1996 24' SCR.
The previous owner said the waste from the head went into the black water holding tank.
When I pumped the head it discharged over board (not good)
Is there a valve some where to switch to holding tank and overboard?
This boat also has a macerator pump and standard pump out on the stern.
Thank You
Tom
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10-25-2020, 07:21 PM
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#2
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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The basic set up is the holding tank with a waste pump out on the starboard stern for vacuum suck out at a pumpout station. Since you were able to discharge overboard you must have pressed the two switches simultaneously. These are only for overboard discharge.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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10-25-2020, 07:47 PM
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#3
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Ensign
Join Date: Oct 2020
Posts: 7
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yes that is correct there is 2 switches for the macerator pump under the dash below the steering wheel to the right.
I did not push them, All I did was raise and lower the handle at the head, like you would do when you flush.
That is why I was wondering if there is a valve some wear that needs to be turned?
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10-25-2020, 09:54 PM
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#4
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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Sounds like you might have a valve. The holding tank is in the engine compartment on the starboard side, look in that area for the valve. My 97’ did not come from the factory with one nor a macerator.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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10-26-2020, 01:50 AM
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#5
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Ensign
Join Date: Oct 2020
Posts: 7
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Thank you, I will keep looking.
Since you have 24' SCR. Do you ever get water in the forward bilge? If so where does it come from? I took about 2 gallons out of mine today and have no Idea where it came in from.
Thanks again
Tom
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10-26-2020, 02:24 AM
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#6
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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Quote:
Originally Posted by TomEllis
Thank you, I will keep looking.
Since you have 24' SCR. Do you ever get water in the forward bilge? If so where does it come from? I took about 2 gallons out of mine today and have no Idea where it came in from.
Thanks again
Tom
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Yes the top is broken off my hawse to anchor locker which lets water in and drains into the forward bilge I believe.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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10-26-2020, 02:18 PM
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#7
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Moderator
Join Date: Apr 2008
Posts: 5,684
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Offshore boats, like sailboats will have this configuration. There is a Y valve that diverts between direct discharge and the holding tank. This allows them to discharge directly at sea, and then switch to a holding tank when they come into port.
The other configuration option most are describing is a macerator that discharges from the holding tank itself. The OP sounds like he has the former option, which is very unusual.
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10-26-2020, 11:14 PM
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#8
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Lt. Commander
Join Date: Jul 2019
Posts: 226
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Just want to throw one more idea out there. I had a clogged vent on the waste holding tank. The pressure when I flushed would build up in the tank and force waste out through the macerator pump.
Sent from my iPhone using Tapatalk
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10-27-2020, 02:34 PM
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#9
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Moderator
Join Date: Apr 2008
Posts: 5,684
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Quote:
Originally Posted by sph801
Just want to throw one more idea out there. I had a clogged vent on the waste holding tank. The pressure when I flushed would build up in the tank and force waste out through the macerator pump.
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If you have the setup which has the macerator drawing from the holding tank and either the macerator discharge is above water, OR if the discharge is below water and the seacock is open, then yes I could see this occurring.
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10-27-2020, 06:14 PM
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#10
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Lt. Commander
Join Date: Jul 2019
Posts: 226
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Quote:
Originally Posted by shrew
If you have the setup which has the macerator drawing from the holding tank and either the macerator discharge is above water, OR if the discharge is below water and the seacock is open, then yes I could see this occurring.
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My macerator draws from the tank and the discharge is above the waterline.
Sent from my iPhone using Tapatalk
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10-28-2020, 03:47 PM
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#11
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Moderator
Join Date: Apr 2008
Posts: 5,684
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You'd be having a difficult time pumping out and would more than likely hear pressure release when you open the pump-put deck plate, if that were the case.
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