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How to get frozen pedal spindles out of crank arms without ruining the cranks?
My MTB pedals (caged not clipless) are frozen ie possibly welde via salt
corrossion to the crank arms. I have tried soaking them in Liquid Wrench but that didn't help much. I have broken a 15mm combination wrench and have sprung its replacement without the spindle flats budging. I read here that you can heat 5the crank itself. How do you tell when it is enough? I don't want to ruin the crank nor weaken it to the point where somewhere down the road the pedal eye snaps. Any useful advice on how to get these pedals off is greatly appreciated. Thanks in advance. Peter |
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#2
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How to get frozen pedal spindles out of crank arms without ruining the cranks?
From the web, I found a table of coeffieient of expansion of some metals. My
industrial expierence showed significant expansion of steel at 180* f. A 10' piece would grow about 1/2 ". The trick will be to keep the spindle cold while heating the crank. Javaloop. Web site quoted table below: " Source: Manufacturer's data Type of metal Coefficient of Expansion Melting point (°F) Melting point (°C) Aluminum 248 1218 659 Brass, navy 212 1650 900 Copper 176 1981 1081 Gold 140 1945 1061 Iron, cast 108 2300 1260 Lead 295 621 328 Silver 191 1764 962 Steel, high carbon 121 2500 1374 Steel, stainless 171 2600-2750 1430-1507 Tin 398 788 415 Note: These are for pure metals. Alloys can vary widely. I have seen other sources with slightly different COEs, but most are close to these figures. (And besides, they're close enough for government work.) Source: U.S. Military Training Circular No. 9-237, "Welding Theory and Application." " |
#3
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How to get frozen pedal spindles out of crank arms without ruining the cranks?
On Fri, 28 May 2004 06:15:01 -0400, "Peter"
wrote: My MTB pedals (caged not clipless) are frozen ie possibly welde via salt corrossion to the crank arms. I have tried soaking them in Liquid Wrench but that didn't help much. I have broken a 15mm combination wrench and have sprung its replacement without the spindle flats budging. I read here that you can heat 5the crank itself. How do you tell when it is enough? I don't want to ruin the crank nor weaken it to the point where somewhere down the road the pedal eye snaps. Any useful advice on how to get these pedals off is greatly appreciated. Thanks in advance. Peter Try soaking the joint in a solvent like iquid wrench over night. tapping the end of the crank lightly to set up some vibration will help get the solvent into the joint. A torch would probably work for tough cases but then you risk putting heat stress into the crank arm and possibly even discoloring it. |
#4
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How to get frozen pedal spindles out of crank arms without ruining the cranks?
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#5
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How to get frozen pedal spindles out of crank arms without ruining the cranks?
On Fri, 28 May 2004 06:15:01 -0400, "Peter"
wrote: that didn't help much. I have broken a 15mm combination wrench and have sprung its replacement without the spindle flats budging. I read here that Try a proper pedal wrench. They are made very tough for this reason, and have lots of leverage. -- Rick Onanian |
#6
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How to get frozen pedal spindles out of crank arms without ruining the cranks?
Of course check that you're turning the proper direction. The left
pedal is threaded backwards. |
#7
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How to get frozen pedal spindles out of crank arms without ruining the cranks?
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#8
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How to get frozen pedal spindles out of crank arms without ruining the cranks?
corrossion to the crank arms. I have tried soaking them in Liquid Wrench but that didn't help much. that is not a great product http://www.kanolabs.com/home.html kroil is the best penetrating solvent out there. it is amazing what it can get apart. -- Knight-Toolworks & Custom Planes Custom made wooden planes at reasonable prices See http://www.knight-toolworks.com For prices and ordering instructions. |
#9
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How to get frozen pedal spindles out of crank arms without ruining the cranks?
Get 'em hot.. Either the heat wrench or the oven.
Phil Brown |
#10
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How to get frozen pedal spindles out of crank arms without ruining the cranks?
Peter Rekow writes:
My MTB pedals (caged not clipless) are frozen ie possibly welded by salt corrosion to the cranks. I have tried soaking them in Liquid Wrench but that didn't help. I have broken a 15mm combination wrench and have sprung its replacement without the spindle flats budging. I read here that you can heat the crank itself. How do you tell when it is enough? I don't want to ruin the crank nor weaken it to the point where somewhere down the road the pedal eye snaps. Any useful advice on how to get these pedals off is greatly appreciated. With the crank removed from the bicycle, heat its pedal end over a gas cooking flame until it is sizzling hot to the wet finger. At this time, the pedal usually comes out relatively easily. Use a long 15mm end wrench or a bicycle specific pedal wrench with the big end of the crank against the floor. Jobst Brandt |
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