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Old 05-12-09, 11:20 AM   #1
rdtompki
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Grease on Threads?

The manual that came with my tandem recommends putting grease on bolt threads before reattaching stems, etc. I find this strange since for larger bolts in automotive-class applications grease is specifically not recommended due to a tendency to exceed the recommended torque. Are we talking the case of a steel bolt and aluminum threads (the typically bicycle situation)? If so wouldn't some other sort of anti-seize compound be preferred?
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Old 05-12-09, 11:33 AM   #2
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ParkTool's pages on torque and fasteners. May be generally helpful, here....

http://www.parktool.com/repair/readhowto.asp?id=88

AND

http://www.parktool.com/repair/readhowto.asp?id=89

AND

http://www.sacskyranch.com/antiseize.htm

I think you can rarely go wrong using anti-seize ... particularly in a dissimilar metals situation like you describe.
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Old 05-12-09, 11:36 AM   #3
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+1 Anti Seize is a must whenever you have dissimilar metals.
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Old 05-12-09, 11:44 AM   #4
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Anti-seize is the reason for putting grease on the threads.
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Originally Posted by bragi "However, it's never a good idea to overgeneralize."
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Old 05-12-09, 11:52 AM   #5
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I put grease on every metal to metal connection on my bike -so yes every bolt.
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Old 05-12-09, 02:05 PM   #6
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check this out: http://www.raskcycle.com/techtip/webdoc14.html
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Old 05-12-09, 02:20 PM   #7
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Quote:
Originally Posted by rdtompki View Post
The manual that came with my tandem recommends putting grease on bolt threads before reattaching stems, etc. I find this strange since for larger bolts in automotive-class applications grease is specifically not recommended due to a tendency to exceed the recommended torque. Are we talking the case of a steel bolt and aluminum threads (the typically bicycle situation)? If so wouldn't some other sort of anti-seize compound be preferred?
Where did you get that? Torque is bolt-tension and torque-specs are given assuming machine-oil is used on the threads. This prevents thread-friction from contributing to the resistance on the torque-wrench. You want to be able to read true bolt-tension, not friction in the threads. The highest-tensions used in cars tend to be head studs, wheel and spindle nuts. Oil is always used on those threads before torquing to spec (grease or anti-seize also lubricates and prevents excessive friction in the threads, especially the larger bolts with higher tensions).

Check out this info sheet from one of the largest manufacturers of anti-seize: http://www.permatex.com/documents/td...tive/81343.pdf .Specifically the "Directions for use" section, line #6.

Also Engine Builder - proper head bolt use

Last edited by DannoXYZ; 05-12-09 at 02:48 PM.
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