Need help with a threaded headset.

Discuss light weight issues concerning road bikes & parts.
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JWolf
Posts: 114
Joined: Fri Jul 13, 2012 9:04 am

by JWolf

I'm trying to remove a fork from a steel track frame with standard type threaded headset. I am holding the bottom nut above the headtube with a headset spanner, and trying to remove the top locknut with a large strong headset wrench. both are 32mm and fit the nuts.

No luck.

Feels like the top lock nut is stuck to the steel fork. It doesn't seem damaged as the headset and steering work fine. Im afraid to grab the fork from underneath the headtube to apply more pressure as I don't want bend the fork.

Lock nut is aluminum and fork is steel.

Any suggestions?

by Weenie


Valbrona
Posts: 1484
Joined: Fri Oct 28, 2011 3:25 am
Location: United Kingdom of Great Britain and Northern Ireland

by Valbrona

JWolf wrote: Im afraid to grab the fork from underneath the headtube to apply more pressure as I don't want bend the fork.


I think that's what you do when you have tried to undo the locknut with two wrenches. Plenty of WD40 might, of course, eventually help free the locknut.

A standard open-ended headset wrench is not the best thing for a locknut. You get proper locknut wrenches which provide more all-round grip, and your local bike mechanic might have one of these.

bm0p700f
in the industry
Posts: 3553
Joined: Sat May 12, 2012 7:25 pm
Location: Glermsford, Suffolk U.K
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by bm0p700f

Plusgas is alot better than WD-40. Why even let WD-40 with 100ft of a bike.

quattrings
Posts: 482
Joined: Sun Nov 14, 2010 10:25 pm

by quattrings

for seized bolts you could:

-Spray with penetrating oil (wd40 is not a good on at that, use PB blaster)
-"scare" it free, by tapping it
-using "reverse psychology", sometimes a bolt will go tighter and then free itself up
-use heat
-use ammonia when corrosion is the possible culprit

boolinwall
Posts: 195
Joined: Thu Aug 23, 2012 11:19 pm

by boolinwall

Good ol' Galvanic corrosion. It used to be quite common during the stell frame/ alloy seatpost era.
If you don't require the headset, use heat. Mind you, if it's corroded in place, the headset's likely toast anyways. So yeah, heat. Keep in mind if you're using a torch to be aware of any previous chemicals you might have already poured into it. You might not like the end result if not.

by Weenie


JWolf
Posts: 114
Joined: Fri Jul 13, 2012 9:04 am

by JWolf

Thanks all. Sprayed it with some lube and bought a good park wrench and spanner and got it off finally.

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