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Old 05-26-2018, 07:56 AM   #21
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City: Seaford Va on Poquoson River, VA
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 2,257
I started on my refurbishment of this 3/4 HP pool pump. Pump is a Dynamo, DYN 11-N1-3/4
Amazon still lists this, and mine is old. I see more powerful dynamo Pentair pumps for less on amazon.
https://www.amazon.com/Pentair-DYNII.../dp/B001GDY3WG

Disassembled the whole thing, cleaned it all and painted the end bells.
Bearings are in good shape.
The air exposed pump shaft was rusty. I primed, painted, then greased and heat shrunk a rubber tube over that, so it will not be rusting again.

The armature, I disassembled the centrifugal switch, cleaned and put a coat of primer on exposed parts. If a motor sits a long time, it can rust armature to stator, and do not want that to happen on the boat.

I should have the pump together today and next week working on the boat.

I have cleaned up the motor housing and the bolt down foot I will coat with some PL to prevent rust, on top of the grey primer. Pump motor was black, I am painting it buff.

When kids were young, we had an above ground pool. I kept the pump and sand filter. Then my friend gave me his pump for his above ground pool, so I now have 2, but his needs a new impeller, which is maybe $25 I don't have to spend..
Impeller for the pump I am using in the boat is # 35-4552

For my purpose 3/4 HP, motors draws 9 amps, is plenty. Other pump is 1HP.
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Old 06-07-2018, 08:27 PM   #22
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City: Seaford Va on Poquoson River, VA
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 2,257
I have the pump in and it works ok, better than the original pump.
I went with the 1 HP pool pump as it is able to shoot water out farther from the hose nozzle than the 3/4 hp pump. the 1 HP pump is 2 inches longer than the 3/4 HP pump.

I have a simple on-off switch, so one side of the outlet is switched, other is on all the time. To prevent deadheading the pump (which does not bother it that I could tell), I tapped into the reducer bushing and ran a 3/8 hose that dumps water to the outside of the hull by way of a small through hull made of a 3/8 copper tube glued into the hull. That will also tell people the pump is on, being so quiet and did not want it left running dead headed for a long time.

I included a check valve in the pump outlet. This prevents water from draining out of the hoses.

I used teflon pipe dope and teflon tape on the joints, and they are dry, no leaks.

I never could make the well pressure switch work, it seems these pumps do not put out enough PSI, and no switch I found had a low enough PSI, which is ok, because stopping and starting them takes a big surge of current. So when the switch is on, the pump is always on.

Pump is very quiet.
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