FM Dewatering pump

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Geochurchi
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Joined: Mon Feb 22, 2021 7:49 am
Location: Concord ,NH / Naples, Fl

FM Dewatering pump

Post by Geochurchi »

Hi All, I have this rusted up pump attached to a B&S motor I have been trying to separate pump from motor without success, any thoughts?
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If it ain’t broken keep working on it until it is .
Geo 🇺🇸
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Harold_V
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Re: FM Dewatering pump

Post by Harold_V »

Phosphoric acid may be the solution, although there's no guarantee. It's gentle---shouldn't do any damage. If you'd like to experiment and you can see a way to do it, use some Coke. As crazy as it may sound, it will loosen rusted connections if it can be applied and allow to remain to do its work.

H
Wise people talk because they have something to say. Fools talk because they have to say something.
Geochurchi
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Joined: Mon Feb 22, 2021 7:49 am
Location: Concord ,NH / Naples, Fl

Re: FM Dewatering pump

Post by Geochurchi »

I have used PB Blaster which I have had great success with and it still won’t free up.
If it ain’t broken keep working on it until it is .
Geo 🇺🇸
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Harold_V
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Re: FM Dewatering pump

Post by Harold_V »

Heat will work, but it will likely do some damage. All depends on what's near the heated areas. You'd have to heat slowly, to avoid cracking the cast iron. If you get it hot enough for the rust to turn black, it should come apart. Most likely not a solution in this case, though.

I'm not familiar with PB Blaster, so I have no opinion.

I have used salt and vinegar, which dissolves rust nicely. You'd probably have to dismantle the engine to try it. That would demand new rings and gaskets upon reassembly. If you choose to try this approach, the entire assembly should be submerged to prevent a line being etched where it would protrude from the solution.

H
Wise people talk because they have something to say. Fools talk because they have to say something.
Russ Hanscom
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Re: FM Dewatering pump

Post by Russ Hanscom »

Is that a screw head in the center of the impeller? If so, probably needs to be removed as part of the process. Any chance of finding drawings?
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Bill Shields
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Re: FM Dewatering pump

Post by Bill Shields »

A couple of gallons of ATF in a tub and let it soak for a few days
Too many things going on to bother listing them.
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liveaboard
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Re: FM Dewatering pump

Post by liveaboard »

I assume that screw is what's frozen?
Weld a handle to it to unscrew it with. the heat will be intense but highly local and the expansion / contraction will break the rust.
It could be a left hand thread, so work it both ways.
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