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Thread: OT - Penetrating Oil
01-13-2010, 07:56 PM #1
OT - Penetrating Oil
In a thread in the antique machinery forum, there was a discussion what to use to free up a part. Southbendmodel34 had mentioned a study in Machinist Workshop stating that Automatic transmission fluid and Acetone mixed was the best.
I just received a newsletter today from Tim Carter mentioning the same study. He had included the results of the test, which I thought interesting.
A study done by Machinist's Workshop magazine in their April 2007 issue looked at different penetrating oils to see which one did the best job of removing a rusted bolt by measuring the pounds of torque required to loosen the bolt once treated. If the study was scientifically accurate, it turns out a home brew works best!
Here's the summary of the test results:
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
01-13-2010, 08:04 PM #2
01-13-2010, 08:10 PM #3
what ATF and what ratio? How do you store acetone in a convenient container where you are not sniffing it all day in the shop and it just evaps out changing your ratio?
01-13-2010, 08:12 PM #4
Two stroke oil is pretty amazing, too.
01-13-2010, 08:25 PM #5
01-13-2010, 08:32 PM #6
I can't report on it's efficacy. I'm using it on a mounting pin rusted in a pair of hydraulic cylinders. 1 month so far, and it's still stuck. I started with Kroil, so far neither has worked. Looks like it's going to need the torch.
01-13-2010, 08:34 PM #7
The so called study did not involve threaded fasteners as I recall. I believe, and correct me if I'm wrong, but it was a press fit. If this witches brew is so good why isn't it in those cans labeled "Kroil" , "PB Blaster", and "WD 40"?
01-13-2010, 08:57 PM #8
01-13-2010, 08:58 PM #9
how do you know it is not?
According to the MSDS for Kroil:
1.) Crude oil (Petroleum Base Oil )
3.) Mineral Spirits (Aliphatic Petroleum Distillate)
Last edited by CalG; 01-14-2010 at 05:46 AM. Reason: Add MSDS
01-13-2010, 09:15 PM #10
Kroil rules !
01-13-2010, 09:26 PM #11
01-13-2010, 09:29 PM #12
01-13-2010, 09:33 PM #13
I find the oxy works best..
01-13-2010, 09:36 PM #14
blue wrench is always an option
01-13-2010, 09:48 PM #15
I have had great luck with KROIL on old tractor implement bolts and such. You know the attachments that never get covered up
Besides I love that Shop-ley smell of KROIL. It'S also alot cheaper than POLO after shave Still stings the same though.
01-13-2010, 09:59 PM #16
I use both Kroil and PB Blaster, but after seeing that report I think I'll just stick with Kroil once the spray can of PB Blaster is gone.
I lucked out with the 1 gallon (US) can of Kroil I got. I had bought a hand-built tool kart (a nearly 300-pound beast with 8" urethane-covered cast wheels and 3/8" thick welded-on top) at an auction of equipment from the closed Warner Swasey/Norton grinder facility in Worcester MA many years ago. Inside one of the compartments was this nearly-full can of Kroil I was told be a friend that is was especially good and somewhat hard-to-find, so I've used it sparingly for years now.
Where's a good source to replenish it?
01-13-2010, 10:19 PM #17
Buy it from Kano Labs
I buy mine right from the Mfg., Kano Labs in Tennessee. Once you buy a little they will send you deal after deal to get you to buy more
I bought a couple gallons and a case of spray cans last year and use it liberally as needed. It's not cheap but it sure does work
As far as the after shave thing goes I only use it for that when I want to keep SWMBO out of the shop
01-14-2010, 03:53 AM #18
01-14-2010, 05:05 AM #19
Kroil is the superior penatrant, but is by far lacking in the ability to help pick up chicks at the tractor pull like a liberal splash of wd40.
01-14-2010, 05:24 AM #20
Kroil is the rats ass. It's probably about the same as the thinned out ATF, but using kerosene. Hard to get acetone/ATF into an aerosol. Nice to know about the ATF and other home remedies in case of a Kroil shortage.
I didn't see the article, but unless they rusted many, many fasteners in a controlled environment and averaged the results, it probably wasn't very scientific. There must be a huge % of variance considering rust, humidity, bolt tolerances, temperature, application of product, time to penetrate, etc.