Author Topic: How to completely remove oil from MOTs?  (Read 302 times)

Offline SalinsLV

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How to completely remove oil from MOTs?
« on: July 26, 2021, 10:47:22 AM »
Hi!

I would like to remove oil from 2 MOTs that are completely covered in Engine oil (MANNOL 7512):



 The reason is that I want to place them clean on a wood surface like this:


I have tried using paper towels to clean the MOTs. After several hours of cleaning, they are still oily as the oil is still inside the windings where i can't reach with my papers. Is there a way to get MOTs completely dry from oil?
« Last Edit: July 26, 2021, 09:21:29 PM by SalinsLV »
K. Salins

Offline rikkitikkitavi

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Re: How to completely remove oil from MOTs?
« Reply #1 on: July 26, 2021, 12:21:54 PM »
The best bet is to heat them to about 60C to make the oil less viscous and then it can seep out more easily


When this no longer is working, immersion in some solvent that dissolves the oil but don't damage the insulation might help, but you need to repeat this.

I think it is an almost lost case there will always be residual oil seeping out.

Perhaps sealing the transformer in a thin coating?
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Offline MRMILSTAR

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Re: How to completely remove oil from MOTs?
« Reply #2 on: July 26, 2021, 02:42:57 PM »
Acetone is probably your best bet. I did an experiment to see if It would damage the insulation on the secondary coil. After leaving some varnish-insulated wire in acetone for a day it appeared to have no affect. The advantage of acetone over gasoline, for example, is that the acetone will completely evaporate. Thus, no residual gasoline smell.
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Offline SalinsLV

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Re: How to completely remove oil from MOTs?
« Reply #3 on: July 26, 2021, 03:04:47 PM »
The best bet is to heat them to about 60C to make the oil less viscous and then it can seep out more easily

I placed both MOTs in the sun and they reached temperature of +45C. With a combination of paper towels and a toothbrush, i'm slowly getting rid of the oil.

Perhaps sealing the transformer in a thin coating?
I could seal the primary and secondary coils if the oil keeps leaking out.

Acetone is probably your best bet. I did an experiment to see if It would damage the insulation on the secondary coil. After leaving some varnish-insulated wire in acetone for a day it appeared to have no affect. The advantage of acetone over gasoline, for example, is that the acetone will completely evaporate. Thus, no residual gasoline smell.

I tried acetone and the oil became more like a fluid for a couple of seconds. I will add more acetone later, as I don't have much left.


Edit:
With the combination of acetone + keeping MOTs in the sun (turning them over from time to time) + using paper towels to clean the remaining oil, I made the transformers dry enough to place them into my setup. Thanks for the replies!
« Last Edit: July 26, 2021, 09:20:44 PM by SalinsLV »
K. Salins

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Re: How to completely remove oil from MOTs?
« Reply #3 on: July 26, 2021, 03:04:47 PM »

 


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