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#31
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Antifreeze to loosen stuck stem?
On Thursday, August 3, 2017 at 8:31:39 AM UTC-7, AMuzi wrote:
On 8/3/2017 1:26 AM, bob prohaska wrote: AMuzi wrote: In practice, since you haven't moved it with normal methods, I only tried for about an hour, not much for problems of this kind. Mostly I wanted to see if the puller and chain sling would hold, and it does. If folks gave posititive reports on the antifreeze trick I'd try that next. It looks like I'll be using the standard heat and penetrating oil quench cycle. That'll take a day or two at least. Fortunately there's no hurry. I do wonder though, what is the ammonia method you mention? we would cut the stem, drop the fork and extract the stump: http://www.yellowjersey.org/stkromi2.jpg Didn't the heat to melt the aluminum anneal the fork? Aluminum flows below the steel's temper limit. We use a large oxy-propane head for this. Understand that the basic problem here is that metal oxides are bigger than metals. Ammonia in theory might reduce the oxide, leaving some space. In practice I've had limited success but some people seem to prefer it. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 I do think Coca-cola worked for me once. I can't prove it. But I tried it one night and the [fluted] post came out the next day. |
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#32
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Antifreeze to loosen stuck stem?
Doug Landau wrote:
I do think Coca-cola worked for me once. I can't prove it. But I tried it one night and the [fluted] post came out the next day. I just happen to have some old Pepsi. It's got phosphoric acid in it, and I'll never drink the stuff, so maybe rotting out a stuck stem is a fitting end for it 8-) bob prohaska |
#33
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Antifreeze to loosen stuck stem?
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#34
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Antifreeze to loosen stuck stem?
Organic solvents DO NOT dissolve inorganic materials.
You stupid or what ? |
#35
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Antifreeze to loosen stuck stem?
Coke contains phosphoric acid used for cleaning concrete n tooth enamel...an inorganic solvent
Citric degreasers n anti freeze are organic solvents ... motor oil n antifreeze are organic...that is of plants or plant like synthetics. 30-40 years ago n then before oral hygiene , a cold coke washed your mouth then deposited a tasty cola mix on the buds. Trick, no ? That bloromed, J, during the usual drug epidemic then 1880-1900 of the usual addictive pain killers n cocaine. Pharmacy coke was maybe $10 Oz. Snake oil wagons not sandwich trucks |
#36
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Antifreeze to loosen stuck stem?
On Saturday, August 5, 2017 at 7:15:41 AM UTC-4, wrote:
Coke contains phosphoric acid used for cleaning concrete n tooth enamel...an inorganic solvent Citric degreasers n anti freeze are organic solvents ... motor oil n antifreeze are organic...that is of plants or plant like synthetics. 30-40 years ago n then before oral hygiene , a cold coke washed your mouth then deposited a tasty cola mix on the buds. Trick, no ? That bloromed, J, during the usual drug epidemic then 1880-1900 of the usual addictive pain killers n cocaine. Pharmacy coke was maybe $10 Oz. Snake oil wagons not sandwich trucks https://www.bing.com/search?q=organi...H &sp=1&ghc=1 https://www.bing.com/search?q=inorga...DB8CAF7F1010B1 |
#37
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Antifreeze to loosen stuck stem?
bob prohaska wrote:
I've got some modern Prestone, in both colors. I think my first bet will be on heat and oil, but after that fails it'll be Pepsi and Prestone, maybe with some heat for good measure. Just to wrap the story up, the solution turned out to be a couple pieces of angle iron, in fact an old bedframe..... They were arranged as a sort of "crutch" alongside the steering tube, with the ends tucked up against the fork crown and held in place with a hose clamp. Turning the bike over and resting the crutches on the garage floor gave enough support to let me drive the stem out using a third piece of angle iron as a drift, under the "chin" of the stem.. The real surprise was how well the "crutches" supported the fork crown against rather vigorous use of a sixteen ounce hammer. Aside from some cosmetic damage no harm was done. I really didn't expect the setup to work, but tried it in preparation for further efforts in the fall. Once apart, no corrosion was found on the aluminum, but visible rust from the steel formed a thin, adherent layer on the stem. A very light cleaning and coat of grease restored a good fit of stem in fork. The puller arrangement was not strong enough; the chain began to stretch before anything moved. A few photos can be found at http://www.zefox.net/~bob/bicycle/stempuller/ Thanks for reading, and everyone's wisdom! bob prohaska |
#38
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Antifreeze to loosen stuck stem?
The unit WAS lubed with antiseize
N mild heat would reduce the hammwring Well thought out rig Publish here as a standalone with a searchable title. |
#39
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Antifreeze to loosen stuck stem?
On Sun, 6 Aug 2017 04:15:44 -0000 (UTC), bob prohaska
wrote: bob prohaska wrote: I've got some modern Prestone, in both colors. I think my first bet will be on heat and oil, but after that fails it'll be Pepsi and Prestone, maybe with some heat for good measure. Just to wrap the story up, the solution turned out to be a couple pieces of angle iron, in fact an old bedframe..... They were arranged as a sort of "crutch" alongside the steering tube, with the ends tucked up against the fork crown and held in place with a hose clamp. Turning the bike over and resting the crutches on the garage floor gave enough support to let me drive the stem out using a third piece of angle iron as a drift, under the "chin" of the stem.. The real surprise was how well the "crutches" supported the fork crown against rather vigorous use of a sixteen ounce hammer. Aside from some cosmetic damage no harm was done. I really didn't expect the setup to work, but tried it in preparation for further efforts in the fall. Once apart, no corrosion was found on the aluminum, but visible rust from the steel formed a thin, adherent layer on the stem. A very light cleaning and coat of grease restored a good fit of stem in fork. The puller arrangement was not strong enough; the chain began to stretch before anything moved. A few photos can be found at http://www.zefox.net/~bob/bicycle/stempuller/ Thanks for reading, and everyone's wisdom! bob prohaska Congratulations. -- Cheers, John B. |
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