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Take a drift punch and give them a good whack or two with a hammer. The shock will help break loose the corrosion.
Also, try tightening them a bit before going loose. You might get some motion in the tight direction to break them loose.
Also, try tightening them a bit before going loose. You might get some motion in the tight direction to break them loose.
Use an impact driver and hex bit that you hit with a hammer converting the blow to shock twisitng. Much like Dave suggested but without the damage to the screws.
Julian
Julian
What are you using for penetrant? I found the 50% auto trans fluid and 50% acetone worked as advertised. Replaced the shocks on my daughters car. Used the mix on one side, nothing on the other. Was amazed at how well it worked.
...Hammering should work, Impact tool may strip them...May work; if that does'nt work, heat them up with a Propane Torch (just a 'Little'!), when they cool down they'll be loose!...
All good ideas, but first try this little trick, which has never failed me for removing stubborn or delicate screws...
Chuck-up the appropriate sized allen bit into your reversible drill-driver nice and tight. Set the clutch to one of the lowest settings, insert into screw and run in reverse direction. The clutch will slip and act like an impact wrench on the screw. Step up to a higher setting or two on the clutch and continue to do this. It will come out in a minute or two.
Oh, and don't forget that the best penetrating oil for frozen bolts is a mixture of 50% ATF and 50% Acetone.
Best Regards!
Garth
Chuck-up the appropriate sized allen bit into your reversible drill-driver nice and tight. Set the clutch to one of the lowest settings, insert into screw and run in reverse direction. The clutch will slip and act like an impact wrench on the screw. Step up to a higher setting or two on the clutch and continue to do this. It will come out in a minute or two.
Oh, and don't forget that the best penetrating oil for frozen bolts is a mixture of 50% ATF and 50% Acetone.
Best Regards!
Garth
Success - finally. I tried most of these ideas, except the drift punch, with no luck. I didn't have a 5 mm impact drive bit or any acetone, so I got them. Another day of soaking with the acetone / atf mix, then used the hammer drive impact; still no go. I think the metal underneath flexes too much. Then I put the 5 mm bit on my air drive impact wrench, and that did the trick.
As I suspected, the threads were never the problem. The problem was galling in the countersink area.
Thanks for the tips, I'm sure I'll use them again. Rodney
As I suspected, the threads were never the problem. The problem was galling in the countersink area.
Thanks for the tips, I'm sure I'll use them again. Rodney