This is a DC submersible motor. I used it couple of times years ago and it had been unused since then. I need to use it again for a sprinkler project. When I took it out of my almirah today, I discovered this long crack on the motor's body. Do you think it is safe to use this motor anymore?

 

Probabally no longer water proof. so potentially dangeous.
What caused the fracture?
Could try filling the split with epoxy resin?
Isn't an Almirah a clothes closet in English?

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Probabally no longer water proof. so potentially dangeous.
What caused the fracture?
Could try filling the split with epoxy resin?
Isn't an Almirah a clothes closet in English?

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Yes. It was inside my closet.

 

Odd it should fracture if it was just stored, unused?!

 

Odd it should fracture if it was just stored, unused?!

That's the behaviour of this plastic. It would not have cracked if stored under water.

 

What voltage does it operate on?

 

Judging from the printing in the picture it looks like a small motor. Given there are no threaded connections or barbs it's probably a small motor, something on the order of 12 volts. Probably DC at that.

IF you plan on using it to pump something flammable - STOP! DO NOT DO THAT! Sparks from a commutator could prove disastrous. But if you're just pumping water AND it's low voltage then not being fully sealed might not be hazardous. However, I'm confident that any bearings or bushings in the motor would be compromised by most fluids.

Best approach is to buy new. Or to find a way to re-seal the pump body. But you're throwing good money after bad.

 

The very first step will be a very quick check to see if the motor runs. If the motor does still run, then sealing the crack adequately is in order.
I suggest not using the motor for any critical application, where failure would cause some sort of disaster, small or large. That is based on it not being a directly mains powered motor.

 

Thank you everyone. I have brought a new one.

 

Judging from the printing in the picture it looks like a small motor. Given there are no threaded connections or barbs it's probably a small motor, something on the order of 12 volts. Probably DC at that.

IF you plan on using it to pump something flammable - STOP! DO NOT DO THAT! Sparks from a commutator could prove disastrous. But if you're just pumping water AND it's low voltage then not being fully sealed might not be hazardous. However, I'm confident that any bearings or bushings in the motor would be compromised by most fluids.

Best approach is to buy new. Or to find a way to re-seal the pump body. But you're throwing good money after bad.

For many years the electric fuel pump motors, LOCATED INSIDE THE GASOLINE TANK were DC brush-type DC motors. I don't recall ever hearing about a fire started by those motors.
GIVEN that the TS never mentioned a voltage and that we never saw the power connection, it appears that fear beat analysis .

 

If I recall, they were totally submerged and lacked the oxygen required for the gasoline to ignite!
The motor is hermetically sealed also.

 

For a gasoline fire there has to be oxygen. Inside a fuel tank is mostly fuel vapor and fuel. A submerged fuel pump has no oxygen to even remotely start a fire.

My neighbor had issues with a fuel pump in his fuel tank. First thing I asked him was if he had fuel in the tank. He said he did. Then he banged on the bottom of the tank and it sounded empty. Apparently the pump failed and got hot enough to evaporate the remaining fuel. The tank was bone dry. Imagine if there had been any oxygen in the tank. Boom!

He replaced the pump and fueled up the tank and all was good to go.

 

I have ordered a new one. Thank you everyone.

 

Would be curious to know what this pump is used for and what voltage it runs on.

The pump in the picture does not have barbs on the outlet. So it's not a high pressure pump, the sort you find in fuel tanks of standard automobiles. It's been a while since I messed with a used fuel pump but I think the discharge tube is axial (straight out the end), not radial. Looks like a radial or centrifugal type pump. The sort that doesn't develop a lot of pressure but moves a higher volume.