1/2" screw would not unscrew with an impact

Not if any water or thread locker got in there. I have had engines where NONE of the bolts would move until I gave them a good heating then hit them with the big gun.

Big gun, you mean a 3/4" impact?

Try tightening it a little first . Sometimes that works , sometimes not .

If there's a bazillion identical screws, and you need to take the assembly apart, and all the screws are coming out easily and cleanly -- then of course chances are high that one will stick.

In my experience working on cars, no, that's not unusual. Have you tried a breaker bar? If you slip a 3- or 4-foot piece of 1" pipe over the handle, you can apply *far* more torque with a breaker bar than you're ever going to get with an impact wrench.

I tried a 24 inch breaker bar. It flexed and did not move the bolt.

I do not really care too much for the bolt. This is essentially a demolition job. If push comes to shove, I can always grind its head down. I just wanted to learn something.

i

I tried a 24 inch breaker bar. It flexed and did not move the bolt.

I do not really care too much for the bolt. This is essentially a demolition job. If push comes to shove, I can always grind its head down. I just wanted to learn something.

------------------- That is complete BS anyway. Note how Dougy never has cites to backup his usual BS and loves to play the know-it-all expert on every subject, no matter which nickname he uses.

mike

Maybe try to lay on it with an air hammer & vibrate the hell out of it for awhile then try the impact wrench again. Also be sure the air hose is not limiting flow to the gun, 1/2" ID hose & shortest run of line possible.

MikeB

It's unusual if you used Kroil on them and gave it a few days to do it's thing.

FWIW -- what penetrating oil are you using, if any. If you apply and let it set for day or two it can be a big help. Kroil seems to work the best for me.

for some general info on penetrating oil see

Gunner Asch fired this volley in news: snipped-for-privacy@4ax.com:

Just use the blue wrench, and be done with it.

LLoyd

Have you saturated it with Liquid Wrench yet?

Good Luck! Rich

Not all impacts are created equal. I have had an old HF 1/2 and an older Remington. The Remington was the superior tool giving me nearly 17 years of use, and it was used when a buddy gave it to me. I may see if I can find parts to rebuild it someday. Anyway, I shopped for a replacement a couple years ago. I found that the torque of various 1/2" impacts varies by a lot.

I found guns that only claimed 350-400 pounds tightening force, and others that claimed over 1200. I bought the best I could afford and I usually only need to crank it up to the top setting to break loosed badly rusted lug nuts on old trailers and things like that.

Not all impacts are created equal. I have had an old HF 1/2 and an older Remington. The Remington was the superior tool giving me nearly 17 years of use, and it was used when a buddy gave it to me. I may see if I can find parts to rebuild it someday. Anyway, I shopped for a replacement a couple years ago. I found that the torque of various 1/2" impacts varies by a lot.

I found guns that only claimed 350-400 pounds tightening force, and others that claimed over 1200. I bought the best I could afford and I usually only need to crank it up to the top setting to break loosed badly rusted lug nuts on old trailers and things like that.

===================

Setting? My $15 unit has no settings on it!

Not all impacts are created equal. I have had an old HF 1/2 and an older Remington. The Remington was the superior tool giving me nearly 17 years of use, and it was used when a buddy gave it to me. I may see if I can find parts to rebuild it someday. Anyway, I shopped for a replacement a couple years ago. I found that the torque of various 1/2" impacts varies by a lot.

I found guns that only claimed 350-400 pounds tightening force, and others that claimed over 1200. I bought the best I could afford and I usually only need to crank it up to the top setting to break loosed badly rusted lug nuts on old trailers and things like that.

===================

Setting? My $15 unit has no settings on it!

"Bob La Londe" fired this volley in news:h1rOp.23445 $ snipped-for-privacy@newsfe07.iad:

Yep. I have a LARGE and heavy Chicago Pneumatic 1/2 that is good to maybe

300ft-lb. I have a small, lightweight IR "pro" gun that is good for 600ft- lb (and really does give it).

LLoyd

Gunner Asch on Tue, 28 Jun 2011 05:28:07 -0700 typed in rec.crafts.metalworking the following:

Don't force it, get a bigger pipe!

Whcih will solve _that_ problem.

I have an IR also, and so far I like it. Check back with me in 17-20 years and I'll let you know if it held up as well as the Remington. LOL.

Here's the sequel.

It would not unscrew with an impact, it would not unscrew with a pipe extension etc. I finally rounded the head.

In the end, I cut the head off with an angle grinder.

The remainder of the bolt in the hole would not budge, no matter what, despite repeated blows with a sledge on a punch, etc.

I said screw it, and cut off the mounting bracket with same angle grinder.

i