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garibaldi's Avatar
Join Date: Mar 2004
Posts: 337
well so much for the "Kontrolierte Qualitat" on those fasteners.

You did tourque it properly right?
Christian Garibaldi
Im a photographer now, so I dont know jack sh#t about cars anymore, I sold my knowledge on ebay
Old 07-01-2004, 10:48 AM
  Pelican Parts Technical Article Directory    Reply With Quote #41 (permalink)
Registered User
Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
Indeed some of the benefits of thread rolling (compressive pre-stress for example) are lost if it is done before heat treating but some remains such as improved grain orientation and the lack of cut grains. Fatigue strength of the rolled threads is much better if the rolling is done after heat treating but this wears out the rolling dies sooner so it is done only on the highest performance fasteners. It is not routine practice with typical 12.9 class strength fasteners. Cheers, Jim
Old 07-01-2004, 08:06 PM
  Pelican Parts Technical Article Directory    Reply With Quote #42 (permalink)
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Nitrometano's Avatar
Join Date: Jun 2003
Location: Guayama, Puerto Rico
Posts: 740
Wrong bolt lenght. The bolts that use the 9 hole crankshaft use less torque that the 6 bolts crankshafts. The bolts that correspond to the 9 hole crankshaft is short compare to the flywheel bolt used on the 6 hole crankshaft.
1972 911T
1991 Mazda RX-7 Turbo II
Are you car loosing power? When was last time you service your fuel injectors? Dirty fuel injectors? Why no try a complete fuel injector cleaning service and return the dignity to you car. Visit and we will return your injectors back to life!
Old 07-19-2004, 05:13 PM
  Pelican Parts Technical Article Directory    Reply With Quote #43 (permalink)

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