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Registered
Join Date: Nov 2002
Location: Planet Eugene
Posts: 4,346
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Torques in Tech. Spec. Book
Generally torque values are designed for lubricated threads (a bit of motor oil), but someone told me that Porsche spec'd the torques in the Tech. Spec. Book for dry threads -- and that if the threads are oily (like most old ones), then they need to be adjusted.
Does anyone know if this is true? If so, let me know where you found it out (Porsche manual, TSB, told that by service mgr., or F. Piech appeared to you in a dream, etc.). |
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08-08-2004, 06:06 PM
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Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,797
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All this talk about torque.....oil, no oil.....wouldn't the thread pitch have somethig to do with it if friction is such a big factor? Generic torque charts that I have seen and downloaded don't say for pitch, just dia.
And the Porsche charts already know what bolt they are referring to, so pitch is accounted for. (They ususally describe it by location rather than by size.) Lastly, dont' most fasteners come with and are stored with a light oil while waiting to be used on the assembly line? |
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08-08-2004, 06:45 PM
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Join Date: Feb 2001
Location: Viera FL
Posts: 5,642
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Torque values are generally assumed as dry unless specifically mentioned in teh workshop manuals.
AFJuvat
__________________
Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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08-08-2004, 06:56 PM
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Location: Planet Eugene
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A lot of the stuff from PAG is dry when I open it. Not sure about the pitch - usually the surface cond. (plated vs. black oxide) is cited as the major effect. It may be that only extreme pitches (thus rarely seen) really affect the torque. I know the bost science web site gives threads about a 45% contributin and the washer friction about the same....
AFJ - maybe I should get a workshop manual and search thru it instead of the Tech. Spec. Booklets...(?) |
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08-08-2004, 07:06 PM
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