Dan-
A couple questios:
Is it self priming or does the water level have to reach the driveshaft?.
There is a 2 to1 reduction in the v-drive so assuming the pump is on the prop shaft end, what is the output at 1,000 RPM (2,000 at the engine)?

Quent
Clairebuoyant, #134

Dan
As you probably know, the output shaft runs at about 1000 RPM max. Pumping
12000 gph isn’t bad, but there isn’t much room between the input and output
shafts. Even if you could squeeze it in there, I think it will get in the
way when you try to do regular maintenance.

Rich

Dan,

The 6″ diameter Fast Flow Pump will surely fit, and you’ll have the higher
RPM’s to drive it. I installed a 7″ diameter Shaft Lok on my jack shaft. Had
to cut a mini-hatch above the space to access it, though.

I can envision lots of circumstances in which you could need a high capacity
bilge pump, but not need the propeller spinning. My guess is that in some
notable percentage of all bilge flooding situations this shaft-driven pump
would be unusable because it requires the propeller to be spinning. That
doesn’t mean you shouldn’t install it. Just have a Plan B for pumping out a
full bilge while the boat is stationary, such as at anchor or aground. Here
are a few possibilities in addition to the primary electric bilge pump and
the manual pump in the cockpit:

1) A second (remote, not submersed) high-capacity electric bilge pump
2) Y-valves to instantly switch the following *intakes to the bilge:
– raw water engine cooling intake
– holding tank discharge pump
– deck wash-down pump
– toilet pump
– any other saltwater pump aboard
3) At least 2 buckets

*All of these intakes can be switched over through one or two Y-valves (from
one or two hoses) if you’ve installed a seawater intake manifold.

Tor

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It appears the intake is the shaft opening in pump housing. I don’t see an inlet where you would attach a hose. This makes sense as it is always running, indicating it is a hydrodynamic pump, not hydrostatic. It won’t prime until it is underwater.
You’d need to build some sort of shelf to mount it on. Getting that in the right spot should prove tricky. I’d do it in the water, it won’t be in the same spot on the hard. It will have to match the angle of the shaft as well. I’d make it a little short and shim the pump housing to the proper height and angle. Good luck working in that area under the output shaft, besides the port cockpit scupper through hull, I can’t think of a more inaccessible location on the boat.

Chuck