Sea King piston pump repair?

[Buccaneer]

I was brain-storming on the 1946 Sea King 64EA-9008A,
3.3 hp, twin opposed again today.
I had it briefly running in the barrel a while back, and the piston pump wasn’t
pumping any water, at least not as high as the powerhead.

I managed to get it to pump water about 10″ up, very anemically, with lower unit
removed, and using a drill. It’s a “strange to me” pump, as this one evidently
doesn’t have a discharge check ball.

The piston was a little looser in the cylinder bore than I liked, so today
I swedged out the open end of the brass piston, using a bull punch, so it fit tighter in the bore,
as that’s the end that pumps the water.

Further brain-storming (or lack of a brain-storming), I was wondering if I added some
“meat” on the piston hard facing, that it would improve pumping action by bringing
the piston a little closer to the discharge hole in the cylinder?
While the driveshaft cam nor the piston hard facing, looks very worn,
the cam only provides 3/16″ of stroke on the piston.
The hard facing on the piston is only .080 thick.

What’s the best was to build-up the hard facing, with the least likely
chance of ruining the piston?
I was thinking about trying to silver solder a dime onto the hard facing.
Would that work?

Thanks.

 

Prepare to be boarded!

[jeff-register]

Just a wild idea, get the piston plated to make it oversized? How is the bore, straight? Guessing! Is the cam worn or full travel?

[Buccaneer]

jeff-register wrote:

Just a wild idea, get the piston plated to make it oversized? How is the bore, straight? Guessing! Is the cam worn or full travel?

This motor is worth about $10, lol. so no extraordinary
means or money will be used.
The bore is a little worn, as is the piston, and I’m
just wanting to get it pumping water good enough
so it can have it’s 15 minutes of glory in the test tank,
and go back on the rack.

I was looking for a parts motor for this Sea King at Tomahawk,
but I didn’t find any other oddball motors with this lower unit.

Prepare to be boarded!

[Buccaneer]

My piston repair on the water pump seemed to be helpful, as
it’s now pumping water. The carb adjustment is very touchy,
and the port side exhaust gasket is leaking water (water cooled muffler),
and I’m not sure if some water could be getting into the port cylinder,
causing the erratic running?

At least the coil swap seems to be working good.

VIDEO
https://youtu.be/yO5WNXc_WCU

Hopefully the Feds won’t come after me for the destruction of the dime!
I ground the hard surface on the piston square on the belt sander to
get it nice and clean, then silver soldered the dime to it.
Then chucked in in the lathe and turned it down to the correct OD.

Prepare to be boarded!

[jcrigan]

Somebody did the same with a nickle on a LT-39 motor that I have. It works great.

[Tubs]

In this system its best to have the sacrificial part
be the easiest to be replaced – repaired – or
made.
Tubs

A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.

[jeff-register]

I like your $10.00 motor!!!

[HARRY D. NICHOLSON]

Of course, dimes haven’t been made of silver for decades.

[Buccaneer]

HARRY D. NICHOLSON wrote:

Of course, dimes haven’t been made of silver for decades.

Yep,, bunches of copper slivers on the lathe,
but lacking a better idea, or material, it will
work long enough until my attention strays
to the next motor, lol

 

Prepare to be boarded!

[Author]

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