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damaged crank threads on pedal end.....any remedy?(4 posts)

damaged crank threads on pedal end.....any remedy?fouzilogic
May 22, 2001 8:09 PM
i have a noisey crank or pedal......the threads are a little dammaged on the pedal end of one of the cranks.......the creaking type sound is much worse with one of 2 sets of spd pedals i have tried------with my older spd pedals it rarely makes the sound....with my newer ultegra spd pedals it makes sound from both cranks........but only one cranks thread is obviously damaged?........

re: damaged crank threads on pedal end.....any remedy?Spoke Wrench
May 23, 2001 7:27 AM
I'd try running the correct tap through both crankarms to clean up the threads. Most bike shops should have the correct taps for doing this. Be sure to start the tap on the inside of the crankarm so that it can get a good straight start on good threads.
re: damaged crank threads on pedal end.....any remedy?ianhale
May 23, 2001 1:46 PM
Tap the crank arm threads out like the previous reply described, then use Loctite Form-A-Thread stripped thread repair kit. This is a two part adhesive to put into the crank arm threads and a mold release compound to put on the pedal threads so you can get them out again. It claims to resore stripped internal threads to grade 5 level (typical automotive bolt and nut strength) which is stonger that the original aluminum (I don't write these claims, I just read them). I have never used the stuff but it is available in automotive stores and big hardware stores for about $6. This is not the usual one part thread locking or retaining compound!

You could have a machine shop put in a metric helicoil but this would require an oversize thread in the crank arm and possibly weaken it too much in that area.
re: damaged crank threads on pedal end.....any remedy?IANHALE
May 24, 2001 8:47 PM
I think that one pedal spindle has right hand threads and one has left hand. Right hand metric helicoils are common but left hand metric "helical threaded inserts" may not exist.

Mr Metric (WWW.FASTENERWEB.COM/MRMETRIC) in San Jose, CA would be the most likely source for left hand inserts if they are available. The price of a left hand repair kit would probably be $80.