Yet Another Cycling Forum
General Category => The Knowledge => Topic started by: rogerzilla on 04 September, 2017, 09:32:24 pm
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£25 for a 1994 Kona MTB frame with a stuck stem (rounded expander bolt) and a stuck seatpost. I can get my money back just by selling the "dog collar" cable guide and seat clamp but I wanted to see if I could get the rest stripped down.I'm assuming the first thing to try on the stem is to hammer a Torx bit into the hole after applying a lot of penetrant? The seatpost might get caustic soda if just twisting it in a vice doesn't work :demon:
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If you have a set of SHARP drill bits and a steady hand I would be inclined to drill the head off the stem bolt - as long as you're sure it's just a rounded bolt socket.
If the stem is stuck then cut the stem off the quill so you can undo the headset then heat the quill, trap it in the vice and fit an old front wheel to the fork for better leverage as you twist the fork off the quill. Appreciate the stem's toast . . .
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if the stem bolt is accessible, weld something to it and use that to undo the expander bolt.
cheers
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I've got a set of (2) seized bolt extractors that actually work well when you follow the destructions. Try screwfix.
Caustic soda - wear goggles and keep it off your skin
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grind the part of the stem off with a grinder leaving the bolt head exposed, then undo it with vice grips or pipe wrench.
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Bit easier to drill the head off! Then the wedge can be loosened with a hammer and punch. It's likely that the stem is also corroded in place, but caustic soda cannot fail.
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Have we, as a forum, abandoned nuking from orbit? Did I miss that memo?
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That's too easy. Just box it up, ship it to Pyongyang, and wait.
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Once the stem is out you can remove the wedge by screwing the stem bolt in from the bottom of the fork and persuading it with a hammer. Means you don't have to hold a punch...
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Head drilled off stem bolt. Wedge dropped straight away (the heat and vibration must have loosened it). Stem is corroded into steerer but it's a steel stem so should shift using penetrating oil and leverage.
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Don't be tempted to do what a friend did trying to release a stuck quill stem in a Battaglin road fork. Remains of the stem in a vice and a piece of 4x2 through the fork legs.
Followed by a long ebay search for a replacement . . .
Engineers! ;D