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Old 05-21-2012, 03:48 PM   #1
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Axle mounting bolts-best lube to free up?

I,m going to do axles. What do you use to prep the bolts/nuts?
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Old 05-21-2012, 04:08 PM   #2
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I used "Blaster" when I did my axle. I sprayed the bolts a couple of times over 3 days. It was still a tough job. A torch would have been much faster for me.
PB Penetrating Catalyst

PB Penetrating Catalyst

The world famous PB Blaster Penetrating Catalyst is more than just great. PB quickly breaks loose surface tension rust and corrosion by creeping up, around and in to hard-to-reach cavities. It's ideal for brake, exhaust and suspension system jobs. Plus, lubricating film remains on parts to help prevent further rusting.
  • A true penetrant
  • Formulated in 1957
  • Rust inhibitor
  • Breaks loose surface tension of rust/frozen parts
  • Much higher flashpoint ** 152F
  • Non-evaporating lubricant
  • Saves time & money by ensuring user will not have to burn off or drill out nuts & bolts or other expensive & time consuming means of repairs
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Old 05-21-2012, 04:15 PM   #3
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Kroil is the best stuff I have found. An old aircraft mechanic told me about it. He used it to free waste gates on turbo chargers, good stuff. PB is good too.
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Old 05-21-2012, 04:25 PM   #4
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I suspect shops use an impact wrench. If you don't have an air gun, a couple of whacks with a hammer would probably loosen up the rust. And, if nothing else, it might let a little more penetrating oil into the threads to soak overnight.
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Old 05-21-2012, 05:00 PM   #5
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A torch is the best! Kroil is next best. Also a homemade penetrant that works well is ATF & acetone mixed 50/50.
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Old 05-21-2012, 07:10 PM   #6
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+1 on Kroil! Been a professional mechanic for 35 years, best stuff I ever used!
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Old 05-21-2012, 07:17 PM   #7
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Thanks for all the responses. This forum is the greatest!
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Old 05-21-2012, 07:36 PM   #8
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Where do you get Kroil? Napa auto parts? Pep boys?
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Old 05-21-2012, 08:06 PM   #9
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My local NAPA has it, but yours doesn't they can most likely get it the next day on the delivery truck. If they can't get it there find out if there is a aircraft supply house close by. They will have it. I never known an A&P mechanic without a can in their tool box.
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Old 05-21-2012, 08:16 PM   #10
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And if some PB or Kroil and an impact don't get the job done ... you may be in a place where use of a torch is an issue, due to position of coach floor, brake wiring, clearances, etc. --- in such circumstances, I often find that a nut splitter is just the ticket. Easy to use, and once the nut is split, it'll come right off. I carry two sizes in my portable tool box. Indispensable.

Ever notice how the nuts you just have to get off are the ones that never had anti-sieze put on them earlier? Why is that?
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Old 05-21-2012, 08:21 PM   #11
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if you can get at the nuts with a wire brush and clean any exposed threads it will help the solvent get in and make backing the nuts off easier.
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Old 05-22-2012, 07:09 AM   #12
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PB Blaster worked well for me when I replaced my axles.
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Old 05-22-2012, 09:02 AM   #13
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Another vote for Kroil. The boatyard I use buys this product exclusively to free up marine rusted parts.
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Old 05-22-2012, 09:09 AM   #14
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I used blaster and soaked them down many times for about a week. They came loose with a 2 foot breaker bar. Also found an impact wrench at tractor supply for $20.
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