Join Date: May 2004
Location: Wilmington, DE
Bikes: 2016 Hong Fu FM-079-F, 1984 Trek 660, 2003 Specialized Hardrock, 2004 LOOK KG386i (RIP), 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2016 Islabikes Beinn 20 (son's)
Mentioned: 6 Post(s)
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Quoted: 540 Post(s)
Um, I'm not sure what your heating of the arm was attempting to cure but if properly re-torquing the crank arm (you did use a torque wrench and grease the bolt, right?) didn't fix the creak, the next thing to look at is the bottom bracket. Chances are your creak will return so you'll get a chance to look there anyway.
Heating aluminum parts to help with press fitting is common with straight bores to avoid gouging the aluminum. With the tapered press fit of your bottom bracket, the heating is unecessary. I doubt you did any harm though as 100 C isn't very hot at all. 175 C would yield some significant expansion of the aluminum though.