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Old Dec 31, 2012 | 06:27 PM
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bluecoupe
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Joined: Oct 2008
Posts: 3,140
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From: Grimsby, Ontario
Default Re: Question about lug bolts..

Originally Posted by James1549
Steve, I think some are making mountains out of mole hills. Wet threads on things with such small torque specs should not make a difference to cause damage. Wet or Dry threads on spark plugs, use the torque spec and you will be fine. I prefer wet threads so I don't chance the possibility of removing threads from aluminum heads the next time I remove the spark plugs. Even at the torque specs of wheel studs, I don't see how it cause such an "over torque" to cause problems. On wheel tightness, I think equal tightness is more important than the actual spec (within reason).

When torque is super critical, the application usually calls for specific compound to be applied on the bolts. Such as "International Compound" has been used for years when installing head bolts, main caps, etc... on engines where large torque specs apply.
Thanks James! MB forums suggested 15-22 ft/lbs torque for spark plugs on the SLK32, I went with 19.5 ft/lbs, anti-seize on the threads, I don't think I'll lose any sleep now.
 
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