Join Date: Nov 2009
Thanked 55 Times in 51 Posts
Rep Power: 5
Thru-hulls and bilge discharge (Coronado 25)
Some of my boat's drain systems confuse me.
There is a tube that goes from one drain (or pair of drains?) in the aft of the
cockpit directly downward, through the bottom of the boat. 'Glassed in place, no valve. You can only see it by looking into the keel hollow under the cockpit, on the centerline of the boat. I had to remove the companionway laddery to look in there. I'm told it's probably for the knotmeter. Maybe so.
The cockpit drain on the forward, starboard side has a thick, black
radiator-looking hose that connects to a small metal thru-hull valve that has no handle. It appears to have a small square where a removeable handle would attach so that you could operate the valve.
The sink/icebox drain thru-hull has such a handle. I wonder if it removes and
swaps between the two? Either way, in this frigid weather, I won't be testing
I don't know where the bilge originally discharged, but I followed the remnants
of the discharge tube all the way back to the outboard engine well. I'm pretty
sure that's not right, but I guess it doesn't harm anything to pump it out
there. I can't/won't re-route it through a thru-hull while the boat's in the water this winter.
Man...the PO had the wiring and the discharge tube running up through the
grab-hole in the keel access panel for all to step on and trip over. The bilge pump was such a tiny thing. Barely adequate for de-watering a standing puddle, and useless for damage control. I'm installing a 1500 GPH Rule pump. That's 25 GPM, probably more like 20 GPM when pumping through a 6' head of tubing. That should pump a full bilge clear in 1-2 minutes. The discharge and the wiring have been re-routed through the keel hollow, out of the way as originally intended.
Excellent progress today.