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How to remove rusted screw

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How to remove rusted screw

Old 06-25-23, 10:21 AM
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How to remove rusted screw

Almost stripped my frame. The last thing remaining is 1 rusty screw: the screw that holds the plastic "rails" on the bottom of the bottom bracket that guides the derailleur cables. I sprayed WD40 from both ends of the screw (multiple times, and waited a few hours in between), even cut a bigger slot to the head of the screw with a hacksaw, but it's not moving.



I'm trying not to destroy the plastic to be able to reuse...
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Old 06-25-23, 11:45 AM
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Originally Posted by flocsy
Almost stripped my frame. The last thing remaining is 1 rusty screw: the screw that holds the plastic "rails" on the bottom of the bottom bracket that guides the derailleur cables. I sprayed WD40 from both ends of the screw (multiple times, and waited a few hours in between), even cut a bigger slot to the head of the screw with a hacksaw, but it's not moving.

I'm trying not to destroy the plastic to be able to reuse...
Small vise grip pliers to break it loose. You don't have to rotate it much.
Then use regular screw driver.
WD-40 is not a good penetrating oil, although better than nothing.
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Old 06-25-23, 11:48 AM
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well the usual. Don't worry about the plastic guide, it's a replaceable part and not very expensive. your local bike shop will have several in the junk drawer.

the best way to do this is soak that screw in PB Blaster if you have some, otherwise WD 40 might help. inside and out

tap lightly with a hammer to break the corrosion free

if you can get a vise grip on the screw head to break it loose, you should be able to loosen it.

/markp
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Old 06-25-23, 12:39 PM
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All else fails drill it out, remount with double face tape, or a bit larger screw.
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Old 06-25-23, 01:23 PM
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could you take a little better picture of this?
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Old 06-25-23, 01:43 PM
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Originally Posted by Schweinhund
could you take a little better picture of this?
use one of these on it.... Twist it in the direction you want the screw to turn, smack it with a hammer.. the screw is now loose and ready to be removed... usually.. and i second the votes for PB Blaster instead of WD-40.
https://www.amazon.com/ABN-Reversibl...84693626&psc=1
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Old 06-25-23, 01:52 PM
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It's a French screw!

Few drops of vinegar?
PB Blaster?
Freezing?
Drill it out and re-tap?

You got this buddy. Sometimes these little things can be quite humbling...
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Old 06-25-23, 02:21 PM
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Originally Posted by maddog34
use one of these on it.... Twist it in the direction you want the screw to turn, smack it with a hammer.. the screw is now loose and ready to be removed... usually.. and i second the votes for PB Blaster instead of WD-40.
https://www.amazon.com/ABN-Reversibl...84693626&psc=1

Yes, use PB Blaster and an impact screwdriver (read the instructions) we have this one in our shop and it saved us a few times from drilling out the screw and retaping https://www.harborfreight.com/6-bit-...ct+screwdriver
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Old 06-25-23, 02:43 PM
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Originally Posted by JoeTBM
Yes, use PB Blaster and an impact screwdriver (read the instructions) we have this one in our shop and it saved us a few times from drilling out the screw and retaping https://www.harborfreight.com/6-bit-...ct+screwdriver
The absolute best penetrant oil i've ever used was sold by Honda.. it is expensive, and hard to find, But WOW!!! IT WORKS WONDERS!.
(..just peeked online... there's a can in Texas.. only $5, but $20 for "SHIPPING"... the can looks "old stock".)

Last edited by maddog34; 06-25-23 at 02:56 PM.
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Old 06-25-23, 02:49 PM
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It's hard to take a good picture, because it's both close and dark... The liquid you see is WD40 "bath"
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Old 06-25-23, 03:02 PM
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Definitely PB Blaster or other dedicated penetrating oil.
Tap screwdriver with a mallet.
Chip away the plastic and you may be able to get vise grips on the screw.
Could also try a heat gun (would not suggest a torch)
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Old 06-25-23, 03:09 PM
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Originally Posted by flocsy

It's hard to take a good picture, because it's both close and dark... The liquid you see is WD40 "bath"
looks like the tip of that screw got swedged too... ouchy... meh.. it'll come out eventually.
An impact driver will not only Turn the screw's threads, but also Shock the rust crystals and break them up some.....
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Old 06-25-23, 03:16 PM
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I only have a big vise grip pliers, but it worked with it plus WD40. It was so hard to rotate the screw that I had to unscrew it all the way using the pliers, 'cause the slot on the head was not strong enough to be able to rotate it. Thanks for the help!
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Old 06-25-23, 03:25 PM
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victory!!!!!!
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