Jonny Shoe Posted April 13, 2007 Report Share Posted April 13, 2007 Hi,I have now been trying for half an hour to take the monty cranks off my snapped T-pro frame, with no luck. They are square taper, therefore I have been using a crank extractor but however hard I try I cannot get the cranks to budge. Does anyone have any fantastic ideas how I can take these bliddy things off, my next move?Thanks Quote Link to comment Share on other sites More sharing options...
billocks Posted April 13, 2007 Report Share Posted April 13, 2007 (edited) big hammer and a kitchen towel round the crank(so dont mash it up)jus give it a good wack.should come off with a abit of a bash Edited April 13, 2007 by billocks Quote Link to comment Share on other sites More sharing options...
thorpy Posted April 13, 2007 Report Share Posted April 13, 2007 get some Plusgas (or any other penatrating oil) and spay aload on the area. Leave it for a good few hours, then give the crank a good thwack with a rubber mallet. Then try with the crank extractor. that might work. Quote Link to comment Share on other sites More sharing options...
dave85 Posted April 13, 2007 Report Share Posted April 13, 2007 The easiest way to do it is to warm the crank. Twatting the hell out of it will probably bend the BB axle, and I doubt the taper is corroded to the crank so penetrating oil is only half a cure. Get some tension on with the puller, then warm the crank up with a blowlamp. Try not to get too much heat into the axle, and it should pop straight off. Quote Link to comment Share on other sites More sharing options...
Adam-Griffin Posted April 13, 2007 Report Share Posted April 13, 2007 heating them up changes the structure of the cranks and can therefore cause things such as the cranks snapping i did it on my old ones it just snapped clean in 2 lol Adam Quote Link to comment Share on other sites More sharing options...
dave85 Posted April 13, 2007 Report Share Posted April 13, 2007 The recovery stages of annealing aluminium occur from 100 celsius upwards, and even then, the grain size remains similar and the dislocations decrease slightly. I said warm, not blast to hell and back again, intelligent use of a blowlamp works, as does boiling water if you're not too happy about gas torches. The last one I did this way could still be (uncomfortably) touched by hand, so the temperature was nowhere near changing anything. Quote Link to comment Share on other sites More sharing options...
Adam-Griffin Posted April 13, 2007 Report Share Posted April 13, 2007 The recovery stages of annealing aluminium occur from 100 celsius upwards, and even then, the grain size remains similar and the dislocations decrease slightly. I said warm, not blast to hell and back again, intelligent use of a blowlamp works, as does boiling water if you're not too happy about gas torches. The last one I did this way could still be (uncomfortably) touched by hand, so the temperature was nowhere near changing anything.bloody hell youve made me feel stupid now lol Quote Link to comment Share on other sites More sharing options...
dave85 Posted April 13, 2007 Report Share Posted April 13, 2007 Two years of uni had to have some use To be fair, its bloody hard to gauge the heat you're putting into alloy, overcooking it is way too easy. Quote Link to comment Share on other sites More sharing options...
Adam-Griffin Posted April 13, 2007 Report Share Posted April 13, 2007 i thought you must have gone to uni but i didnt want to sound like a smart ars and say "what uni did u go to lol " btw boiling the kettle and puring it on normally works for me lol Adam Quote Link to comment Share on other sites More sharing options...
ogre Posted April 13, 2007 Report Share Posted April 13, 2007 bodge an extention bar onto the crank extractor? Quote Link to comment Share on other sites More sharing options...
trials rules Posted April 13, 2007 Report Share Posted April 13, 2007 Tap the crank around a bit with a rubber mallet to loosen it up. As in, onto the BB and off it. This seemed to do the trick for me. But i suppose it does depend on why it's stuck - fusion of metals or what ever it is, or pushed on too far. Experiment! Quote Link to comment Share on other sites More sharing options...
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