MotorHead

Some info from another forum that I found:

Penetrating Oils Compared

Machinist's Workshop magazine actually tested penetrants for break
out torque on rusted nuts. Significant results! They arranged a subjective test of all the popular penetrants with the control being the torque required to remove the nut from a "scientifically rusted" environment.


Penetrating oil .......... Average load
None ..................... 516 pounds
WD-40 .................... 238 pounds
PB Blaster ............... 214 pounds
Liquid Wrench ............ 127 pounds
Kano Kroil ............... 106 pounds
ATF-Acetone mix............ 53 pounds

The Automatic Transmission fluid (ATF)-Acetone mix was a "home brew" mixof 50 - 50 automatic transmission fluid and acetone.

Note the "home brew" was better than any commercial product in this
one particular test.
A local machinist group mixed up a batch and all now use it with equally good results. Note also that "Liquid Wrench" is aboutas good as "Kroil" for about 20% of the price.

Little Mouse

Rats im fixing to try crc freeze-off, no test on it. have heard that before on the on the mix with automatic trans fluid. wonder if they looked at coca-cola, broken many an engine loose and people put that in there stomach

MotorHead

I have 2 cans of that Freeze stuff, had them for a few years, never tried them yet, been using Kroil, now I am going to mix my own, I think I have done that years ago but can't remember how good the home brew is

Rich's'78

Thanks!

scottyp99

Any particular ATF used?

Scott

SpartyGW

I'd like to read more about the test environment. Got a link to this?

7t2vette

Good info, I will give that ATF/acetone mix a try! I've been wanting to try that freeze stuff....I wonder how well it works?

doorgunner

EDITED:



NOW you tell me after I did the rear suspension!

But seriously.....

thanks for the good info....I still have to do the front suspension!

7t9l82

i used atf / acetone years ago and it always worked well. i tried wd-40 rust release and it worked pretty well. im gonna mix up a batch of atf and keep it in a spray bottle.

CanadaGrant

I'm going to give that a shot on a set of 427 AIR tubes that have never been unbolted from the exhaust manifolds since 1969....

hereigo

Great info...I'm in the middle of a frame off....thank you!!!

Mick71

Good to know, thanks. How's the retirement going?

Little Mouse

I saw these test results on speed talk quite some time ago. Never thought it would be of that much interest to share it.

Brass Pass

Thanks for the info.

I've always used Kano Kroil, but thats going to change.

Little Mouse

I have a busted off harmonic balancer bolt to get out of a V6. tomorrow I may well give the freeze-off its test, wd 40 did nothing to help.

hugie82

Perfect timing I'm doing exhaust manifolds on my 93 Z71 with 220,000 miles on them. This will come in handy

MrJlr

It's very interesting. I'd like to do some tests myself but my '74 is a California car and hasn't had a stuck bolt yet

But thanks for the tip
I WILL remember it !!!

Rich's'78

Acetone is quite low boiling (B.P. 57*C) and will tend to build pressure in the bottle, possibly causing causing it to leak. It needs to be kept in a container with a tight-fitting lid. It is sold at a huge mark-up.
Since you don't need a large quantity, nail polish remover is much cheaper. Nail polish remover is usually a mixture of acetone and ethyl acetate (B.P. 77*C) and should work as well, or better.