Introduction: Home-made Penetrating Oil
This weekend I did a front brake job on my vehicle. After using 2 cans of commercial penetrating oil (lubricant) I still could not remove the rusted brake rotor from the axle spindle. I had tried various additional things like a bigger hammer, heat and rapid cool, it would not come off. Now this is not my idea, it took about 2 hours of internet browsing to find a solution and people who tried it were singing it's praises and now I am a believer also. One person on another site said there was actually a study comparing this home-made to commercial brands and the home-made required 30% of the torque of commercial brands to loosen rusted bolts. And it is by far cheaper than the commercial brands like WD-?? for example.
Here is what you need. A cheap spray bottle (you probably have an empty one laying around). In this bottle mix a 50/50 mix of 100% acetone and dextron/mercron automatic transmission fluid. The two fluids will separate like oil and vinegar so you have to shake the bottle well before spraying.
I mixed up a batch and let it soak for 15 minutes on the rotor and with a few taps it came right off. Yesterday I spent 6 hours with 2 cans of the commercial brand with no success. My other rotor was equally rusted, and came off the same with this stuff only.
Hopefully this helps someone else out too.
Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.