308/328 workshop manual question | FerrariChat

308/328 workshop manual question

Discussion in 'Technical Q&A' started by jonesdds, Nov 30, 2007.

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  1. jonesdds

    jonesdds Formula 3

    Aug 31, 2006
    2,163
    SB,CA & Park City UT
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    Jeff
    I downloaded this item from ferrari.jenkins.org/books but I can't read some of it and I'm wondering if someone has a better copy or just knows what it says.

    Specifically, on the pages showing tables of torque values, the last column. I see Nm and I think Kg/cm but I'm wondering about what is in front of Nm in that far right column. The values are far to low to be Nm but mulitplying by 10 seems maybe too high for certain values I know about already. Anyone know?

    Jeff
     
  2. BigTex

    BigTex Seven Time F1 World Champ
    Owner Rossa Subscribed

    Dec 6, 2002
    79,406
    Houston, Texas
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    Bubba
    I can check my copy...go easy though as there ARE mistakes.....remember you are working often with aluminim castings.

    I'd go with an SAE table based upon bolt/nut size, myself.....
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,932
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    da Nm = deka Nm = 10 Nm = 7.38 lb-ft = approx 1 Kg-m

    so multiple the value in the column by 7.38 to get the value in lb-ft

    What torque value do you think is whacky?
     
  4. 2NA

    2NA F1 World Champ
    Consultant Owner Professional Ferrari Technician

    Dec 29, 2006
    18,221
    Twin Cities
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    Tim Keseluk
    Italian manuals are frequently wrong. As BigTex recommended, exercise caution when using torque values from an old manual.
     
  5. BigTex

    BigTex Seven Time F1 World Champ
    Owner Rossa Subscribed

    Dec 6, 2002
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    Houston, Texas
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    Bubba
    I just didn't want him to break anything....LOL!
     
  6. jonesdds

    jonesdds Formula 3

    Aug 31, 2006
    2,163
    SB,CA & Park City UT
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    Jeff
    For now, I was only looking at wheel bolts-stock bolts and wheels. Local tire shops said only 77 ft-lbs but that seemed too low to me. Mechanic said better off about 90 ft-lbs. So, manual says 16 deka Nm(pretty much what I thought) so that's 160 Nm's or 116 ft-lbs according to my calculations. 116 ft-lbs make the most sense?

    Also, I'm having the wheels powdercoated and then installing the Hill Engineering bolts I've purchased. I wonder if any change in torque settings for those bolts is in order-they're steel, not titanium?

    Jeff
     
  7. jonesdds

    jonesdds Formula 3

    Aug 31, 2006
    2,163
    SB,CA & Park City UT
    Full Name:
    Jeff
    Me neither. For things like the oil drain plug, I'm using feel more than torque values.

    Jeff
     
  8. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,932
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    If you thought 77 ft-lbs was too low you aren't going to like this ;)

    I think you are off a row in using that table -- the stock torque for "securing wheels to hub" is shown as 10 daNm or ~74 ft-lbs (and in the older F manuals where they use 10 Kg-m that translates to ~72 ft lbs). It's true that people here talk about going higher (I personally use 80 ft-lbs and others have quoted higher values for racing), but the tire shop was/is closest to the "stock" value.
     
  9. jonesdds

    jonesdds Formula 3

    Aug 31, 2006
    2,163
    SB,CA & Park City UT
    Full Name:
    Jeff

    Yep, told you I couldn't read it. 10 deka Nm's, not 16. My mechanic seems very alarmed when mine were at 80 lb-ft, felt it should be more like 85 or 90. I've been doing 85 and I guess I'll stick with it.

    Thanks for the help.

    Jeff
     

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