Recommendation on penetrating oil for rusted bolts?

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March 04, 2017, 05:41 PM

GarandGuy

Recommendation on penetrating oil for rusted bolts?

Pulled the deck off my John Deere mower to change the blades and the bolts holding the blades on are seized and rusted. They won't budge, even with a breaker bar. I want to soak them with a good penetrating oil, but which one to use? WD40 or Kroil didn't work.

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March 04, 2017, 05:42 PM

MikeinNC

Kroil

If that doesn't work, add some heat with a torch.

Then use a breaker bar and maybe have someone smack the wrench/socket with a hammer

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March 04, 2017, 05:50 PM

olfuzzy

^^^^This^^^^

I used to go through this every year, I finally broke down and bought a Dewalt electric impact wrench. Wish I'd done it years ago.

March 04, 2017, 05:52 PM

jcsabolt2

Torch the head of the bolt until you hear a POP! Just do the head, nothing else. It will glow red hot, but it will come right off with a breaker bar after that. After it cools and you are ready to put it back together, cover the threads in anti-seize. You shouldn't have a problem after that.

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March 04, 2017, 05:53 PM

egregore

WD-40 is a poor rust penetrant, but Kroil is one of the best. If this didn't loosen it up, you're probably going to need some heat from an oxy-fuel torch and some vibration, from an air hammer and/or an impact wrench, to shock them loose. These can be rented if you don't have them, or the machine taken to a shop, if you have a trusted one. And be prepared to have to replace the bolts.

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March 04, 2017, 05:56 PM

6guns

PB Blaster works pretty well.

Agree, heat is a good solution when necessary and surprisingly, bees wax with heat does an excellent job!

Yes, never seize bolts before reassembling.

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March 04, 2017, 06:18 PM

sourdough44

The PB Blaster then maybe a pipe on the breaker bar, if it will fit. Start with a tight fitting, quality socket.

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March 04, 2017, 06:23 PM

GaryBF

Where's the love for Liquid Wrench? That's been my go-to forever. Any of them may take some time to work.

March 04, 2017, 06:29 PM

MRMATT

A 50-50 mixture of ATF and acetone supposedly beats all the commercially available products.

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March 04, 2017, 06:50 PM

Bisleyblackhawk

Kroil...railroads couldn't function without Kroil...they buy it by the gallon...if Kroil didn't work, there was always the torch.

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March 04, 2017, 06:54 PM

comet24

Kroil or PB Blaster

WD40 really isn't that great at helping remove rusted bolts. If you have some time spray it tonight then again in the morning. Then try and remove it.

I use anti seize when I put anything that might rust/get stuck back together. Makes things much easier next time.

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March 04, 2017, 06:55 PM

45 Cal

P B Blaster is convent and cheap .I have both that and Kroll ,but that gallon can is a pain when you need something quick to spray.

March 04, 2017, 07:36 PM

midwest guy

quote:
Originally posted by MRMATT:
A 50-50 mixture of ATF and acetone supposedly beats all the commercially available products.

. Lab tests do recommend the above!

March 04, 2017, 07:38 PM

Hamden106

This is the best penetrant I ever saw. But it is nasty. Probably not even legal anymore.

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March 04, 2017, 07:39 PM

greco

Kroil is the shnizzle knizzel for rusty bolts. See above