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Subject: Penetrating oil

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Steve Dabrowski    Posted 12-11-2022 at 16:36:13 [URL] [DELETE]        [Reply] [No Email]  
  • Penetrating oil
  • The subject of what to use for rusted on bolt removal has come up at times on this board and generally the use of a 50/50 solution of acetone and automatic transmission fluid is usually favored. This month in my issue of Airheads magazine for BMW motorcycle owner's there was a short article on this subject.

    Machinist's Workshop magazine tested penetrants for breakout torque on a controlled "scientifically rusted" nut. No details on the size of the sample, but trusting they used something appropriate, the results were as follows:

    No oil 516 lbs
    WD-40 238 lbs
    PB Blaster 214 lbs
    Liquid Wrench 127 lbs
    Kano Kroil 106 lbs
    ATF-Acetone mix 53 lbs

    Kind of interesting to have some data confirming an accepted opinion.

    Del Huebner    Posted 12-15-2022 at 13:52:43 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Penetrating oil
  • Thanks for the info Steve. I use the 50/50 on the larger projects like axle bolts and fender bolts and such. Like Ed said just mix what you need for the project ( I use a plastic squeeze bottle) and discard if there is a small amount left. For smaller projects I still use PB Blaster.

    Lynn Patrick    Posted 12-14-2022 at 22:22:59 [URL] [DELETE]        [Reply] [Email]  
  • Re: Penetrating oil
  • I am really interested in this and have a couple questions.
    How do you store it, or must it be mixed as needed? I would expect the acetone to evaporate quickly, so is a pump oil can the wrong way to keep it? How do you who use it handle it?

    Steve Dabrowski    Posted 12-15-2022 at 17:47:21 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Penetrating oil
  • I just mix some in a plastic squeeze bottle like those you find mustard in at the drive in except it is clear and has a stopper cap. I filled it a few years ago and have used it over that time, but usually pour in some acetone to match the oil as I'm guessing the acetone evaporates over time. Probably best to do as Ed and Del suggest, mix it up when you need it from a couple of cans of each on the shelf.

    Ed Gooding (VA)    Posted 12-15-2022 at 13:21:12 [URL] [DELETE]        [Reply] [Email]  
  • Re: Penetrating oil
  • I learned about using the 50/50 mix from this site years ago and use it all the time. I always have a can of acetone here (use it to clean vintage tools and gun parts) and ATF on the shelf, so I mix up a little to use for a project and don't store it. I use an empty 8 oz. Kroil can for this purpose. It does have a cap for the spout but I tend to use the mix on a project and dump the little that is left over rather than store it.

    For those who have not used acetone, it's important to note that the fumes are more volatile than gasoline. You need to use it in a well-ventilated area (outdoors is best) and not have a source of fire nearby when using it.

    Bruce(OR)    Posted 12-12-2022 at 12:47:51 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Penetrating oil
  • Allowed saturation time?
    Temperature of test?
    How much upward capillary action was achieved?
    Superzilla not listed? (Relatively unknown)

    As for the nut, was that a class 1,2, 3 or 4 fit?
    Annodized or zinc?

    For being a 'scientific' test, I wonder.

    Or was this just a self serving "home brew" works best?

    I know! Just something to sell stories.

    Steve Dabrowski    Posted 12-14-2022 at 17:48:36 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Penetrating oil
  • My intent was not to introduce a detailed test analysis-just to show an article that might be useful to readers in giving a comparison. If anyone needs to have a detailed analysis in order to decide if the Acetone-ATF mix is useful then perhaps they can find it in the Machinist Workshop magazine where it originated.

    I started using it based on a couple of posts on this forum a few years ago and it seems to work fine. Used it a couple of months ago removing the cylinder head studs in my s/n 292 9N block.

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