Warning about Torque Specs - K-Bikes.com - Excellence in Motion
 
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post #1 of 5 (permalink) Old Jun 16th, 2006, 5:36 pm Thread Starter
 
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Unhappy Warning about Torque Specs

I just used the torque specification of 40nm to tighten a front caliper bolt on my 2002 K1200RS and it broke the bolt. LD informed me the correct specification was 30nm. I got the 40nm specification from the http://piratesk12site.net/tchart5.htm under the "brake" section. LD informed me that 40nm is for the rear.

I got really lucky and a strand of metal between the broken pieces saved me a huge headache.


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post #2 of 5 (permalink) Old Jun 16th, 2006, 10:23 pm
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still it shoulnt have broke....7 lbs?
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post #3 of 5 (permalink) Old Jun 17th, 2006, 2:51 am
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Quote:
Originally Posted by BAK04GT
still it shoulnt have broke....7 lbs?
30Nm (what the manual calls for) converts to about 22 ft lbs....or is it lb ft? Whatever.

It still converts to 22 of them. :p

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post #4 of 5 (permalink) Old Jun 17th, 2006, 6:42 pm
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Quote:
Originally Posted by carnadero
30Nm (what the manual calls for) converts to about 22 ft lbs....or is it lb ft? Whatever.

It still converts to 22 of them. :p
what i was saying that an additional 7 lbs over the 30nm..or what i meant...one of them :p

Last edited by BAK04GT; Jun 17th, 2006 at 8:04 pm.
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post #5 of 5 (permalink) Old Jun 22nd, 2006, 9:23 am
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I always 'feel' the torque on a bolt as I'm tightening it. You can't just wrench on numbers. Sometimes threads can get damaged and it's better to keep your instincts alive to a thread about to go. If you use a torque wrench for high torques with a long bar, you get bigger innacuracies at the lower and so much leverage you can go over the top. My low range bar is only about 8" long.

For steel bolts into aluminium, one thread can get damaged or be corroded and lock up a bolt, so when you torque by numbers you just ruin the thread and risk shearing the bolt. I keep a few taps around to clean out threads. Loctite once used, can be problematic if not cleaned out and re-applied.



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