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dielectric oil?

wttwoa

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Jun 2, 2009
Messages
126
Location
alabama
the gasket to the pump in the septic tank failed and let water into the motor housing and let the oil in it out. thankfully it tripped the outlet and didnt burn the pump up. i pulled up the manual to the pump and it says to use a dielectric oil and i went to lowes and couldnt find it anywhere i was wondering if its possible to use any other type of oil in it? any advice would be helpful.
 
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Gotcha640

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Jan 27, 2015
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948
Location
Houston TX
When I worked at a machine shop during high school, I very helpfully took the power wash sump pump apart and brake cleanered the dielectric oil out. It took 3 days for the supplier to bring us some more, they only sold it by the gallon, and we needed about a pint.

Tractor supply? Grainger? Amazon?

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dave*99

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May 5, 2009
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Coastal NJ
Find a local electric motor repair shop. They will have it if they work on submersible pumps.
 

rlitman

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Oct 18, 2010
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Location
Long Island
If the shaft seal failed, be sure the shaft is in an adequate condition to put a new seal in before you end up ruining the next seal and make things worse.

My experience with oil filled pumps is that they're disposable. If you need to crack the case and replace the oil, the pump is probably in a condition where it is no longer worth fixing.
 

RocketScott

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Jul 20, 2016
Messages
262
Location
Lexington, KY
Mineral oil will work.

Had a sump pump that had the same problem. Cleaned the seal, refilled with mineral oil and it's been fine ever since.

It's sold at the drug store as 'intestinal lubricant'. I got some funny looks when I bought 3 quarts of it.
 

pstnbly

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Jul 20, 2010
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Location
So. Vermont
Just replace the pump. Effluent is highly corrosive, even if the old pump works initially it wont live long.
 
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mburrus

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Nov 15, 2014
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235
Location
Miami, Fl
i vote for replacing the pump. your local electrical utility has transformer oil, and thats as dielectric as it gets. may be hard to convince them to give you some, unless you know someone who works there...
 

theoldwizard1

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Feb 22, 2011
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43,460
Location
SE MI
Mineral oil will work.

Had a sump pump that had the same problem. Cleaned the seal, refilled with mineral oil and it's been fine ever since.
Crazy PC people would put their mother board in an aquarium full of mineral oil. Of course after hours of gaming at some ungodly GHz, you had 10 gallons of 120F oil !
 

nehog

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Jan 2, 2010
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Location
Jaffrey, NH
Crazy PC people would put their mother board in an aquarium full of mineral oil. Of course after hours of gaming at some ungodly GHz, you had 10 gallons of 120F oil !

I doubt mineral oil would be suitable for a gaming computer! A motor, absolutely, a transformer - yep, but not a gaming computer! If you were lucky, that oil would be almost hot enough to make fries! 120F is not hot for a cooling medium.

And most oil used for insulation is indeed mineral oil. With additives usually, but I'd not hesitate to use mineral oil if I had to.

OK, just to be fair--I'll try the rest of the night with my notebook in a small tank of mineral oil. OK, here goez. Gww, rhat"s snot bad.

(OI, it got slipperie fast.) :rocker:
 

dowmace

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Apr 30, 2012
Messages
596
Location
KCMO
I doubt mineral oil would be suitable for a gaming computer! A motor, absolutely, a transformer - yep, but not a gaming computer! If you were lucky, that oil would be almost hot enough to make fries! 120F is not hot for a cooling medium.

And most oil used for insulation is indeed mineral oil. With additives usually, but I'd not hesitate to use mineral oil if I had to.

OK, just to be fair--I'll try the rest of the night with my notebook in a small tank of mineral oil. OK, here goez. Gww, rhat"s snot bad.

(OI, it got slipperie fast.) :rocker:
Years ago as in 1998 or 2000ish there was an article on overclockers.com where a guy put his rig in mineral oil. If i remember correctly it killed the fans to run in the oil because of the resistance.

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nehog

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Years ago as in 1998 or 2000ish there was an article on overclockers.com where a guy put his rig in mineral oil. If i remember correctly it killed the fans to run in the oil because of the resistance.

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I'll bet it did kill the fans! Oil is not a great conductor of heat (water or water/glycol (anti-freeze)) is much better. For CPUs I'd use distilled water probably. Some of my ex students are using water cooled computers.
 

crerus75

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May 2, 2011
Messages
301
I knew someone that tested a motherboard in an aquarium full of mineral oil as an engineering school project. They did the heat transfer calculations, which said it would work, and then tested it. Ended up working fine. I don't think it was a gaming PC, though, and I wouldn't want an aquarium full of oil anywhere in my house, but interesting nonetheless.

Ridgid sells quarts of dielectric oil specifically for oil-cooled motors. I bought a quart online for a submersible pump that I accidentally drained (was replacing the impeller, took a few too many screws out). If it had been my pump, I would've bought a gallon of mineral oil on Amazon and called it good, but it was for a friend, so I ponied up for the "real" oil. Shop around for price, but I think I bought mine directly from Ridgid. Cheapest would probably be from a motor shop, if there are any left in your area.
 
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