February 3, 2015

A Reader Sends: For All You Mechanics

h/t Z-Man:
"Machinist's Workshop" recently published information on various penetrating oils. The magazine reports they tested these products for "break out "torque" on rusted nuts and bolts. A subjective test was made of popular penetrating oils, with the unit of merit being the torque required to remove the nut from a "scientifically rusted" bolt.  Average torque load to loosen nut:

No Oil used ........................516 foot pounds
WD-40 ..................... ........238 foot pounds
PB Blaster .........................214 foot pounds
Liquid Wrench ......................127 foot pounds
Kano Kroil .........................106 foot pounds
ATF/Acetone mix...................... 53 foot pounds

The ATF/Acetone mix is a "home brew" mix of 50/50 automatic transmission fluid and acetone. Note this "home brew" released bolts better than anycommercial product in this one particular test.
Our local machinist group mixed up a batch, and we all now use it with equally good results. Note also that Liquid Wrench is almost as good as Kroil for 20% of the price. ATF/Acetone mix is best, but you can also use ATF and lacquer thinner in a50/50 mix. ATF = Any type of Automatic Transmission Fluid. 


This version of the story was in one of the Military Vehicle Club newsletters.

5 comments:

  1. It works. Have removed several stubborn mosin barrels from their receivers using it. If you don't have any acetone, try lacquer thinner, xylene, MEK, any of the ketone based solvents will work.

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  2. It indeed does work well, the only down side is that the two will not stay in solution together. They will separate when left sitting for any length of time. The good news, just shake the container a couple of times.

    Acetone also works well for stainless steel as a penetrant all by its self.

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  3. We need to re-learn about an old trick, how to make your own bore cleaner. It's known as Ed's Red bore cleaner, and here's the recipe (from memory): kerosene, acetone, mineral spirits, and ATF. It was based on another older formula made at Frankford Arsenal. I've used Ed's Red and it works well. And you can use old ATF after it's drained from the 'tranny.

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