Newbie, starting to work on my own cars, and I'd like to use air tools to save wear and tear on my wrists and arm muscles, and not aggravate back pain from a car accident years ago.
There are many discussions about making sure not to over-tighten bolts with air tools. I understand I need to restrict the pressure given to the air tools, and perhaps even use torque bars/sticks with an impact driver at least in the higher ranges they usually come in like 65-150 ft-lbs.
There are also many discussions about the risks of air tools breaking a bolt that's rusted on.
My question is if using torque bars/sticks with an impact driver when removing a rusty bolt would be a good idea. Assuming they work in reverse, anyway, which I'm hoping they can either for this purpose or left handed bolts.
My hope is to let the impact driver hit the bolt with a high but limited amount of force, and if that doesn't work, then try a torch or penetrating oil. Basically, to avoid torching or oiling when it's not necessary.
A couple of YouTube videos (Part 1 & Part 2) comparing various things like a torch, penetrating oil, CRC, acetone/ATF homebrew, etc, showed at least in those tests that the maximum needed without anything applied was about 132ft-lbs. (Although, an article shows way more, 516ft-lbs.) I'm hoping limiting the impact driver to 150ft-lbs might let it give it a shot, and cut down most of the risk of breaking it. I'm not seeing torque bars/sticks anywhere over 150 ft-lbs.
I guess it would be worth knowing the lowest torque that most rusted bolts break at, basically a "safe zone", but I haven't had luck finding someone looking at that.