348 Torque Ratings for Various Components | FerrariChat
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348 Torque Ratings for Various Components

Discussion in '348/355' started by 348steve, May 13, 2019.

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  1. 348steve

    348steve Karting

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    #1 348steve, May 13, 2019
    Still on the venture of slowly pulling the 348 engine back together. All is going well!

    I notice in the "manual" that there are a few discrepancies when it comes torque ratings. If anyone can comment on the following please do.

    - Torque required for the water pump bolts? I see 25Nm listed on page B88 in the manual for the bolts that attach to the block, but what about the others?

    - The camshaft caps appear to require 8.8Nm as listed on page B53 but the summary spec on page B88 says 0,8?

    - Any advice for torque best practice on front cover or oil pan?


    Quick pic below to show where we are at .... Head gaskets in place, heads all cleaned and ported, valves lapped and looking perfect, shims on their way, all bearings done, new tensioners and a whole lot more....



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  2. yelcab

    yelcab F1 World Champ
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    #2 yelcab, May 13, 2019
    8.8 Nm is equal to 0.8 KgForce, two units, same torque
    Water pump, M8 25 Nm, M6 if you have it is no more than 10Nm
     
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  3. fatbillybob

    fatbillybob Two Time F1 World Champ
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    #3 fatbillybob, May 13, 2019
    What water pump you putting back in?
     
  4. m.stojanovic

    m.stojanovic F1 Rookie
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    #4 m.stojanovic, May 13, 2019
    0,8 Nm on page B88 is a typing error, 8.8 (8,8) Nm is correct. When in doubt, double check with the general fastening torques table:
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  5. 348steve

    348steve Karting

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    #5 348steve, May 14, 2019
    I opted for the Ricambi supplied aftermarket unit with the contoured impeller and hopefully high performance bearings.
     
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  6. 348steve

    348steve Karting

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    #6 348steve, May 14, 2019
    Excellent info! Thanks.
     
  7. m.stojanovic

    m.stojanovic F1 Rookie
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    #7 m.stojanovic, May 14, 2019
    By the way, the 0,8 Nm specified on page B88 is not for camshaft caps it is for "Timhaft" caps. Different part.
     
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  8. Davsk1

    Davsk1 Karting

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    #8 Davsk1, May 16, 2019
    I use this for fasteners if you don't have a torque spec or if you are in doubt. I've used it to calculate various sump plugs and difficult fastenings etc and always been successful. Just make sure you put the right materials in and aire on the side of safety.

    http://www.futek.com/boltcalc.aspx?mode=metric
     
  9. 348steve

    348steve Karting

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    #9 348steve, May 27, 2019
    Important note! When they say bolt size on this chart, they mean the bolt shoulder diameter and not the wrench size!
     
  10. 348steve

    348steve Karting

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    #10 348steve, May 27, 2019
    Just thought I would mention it because I thought otherwise for one minute and that would be silly! Bad!
     
  11. m.stojanovic

    m.stojanovic F1 Rookie
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    #11 m.stojanovic, May 28, 2019
    Not really silly. I noticed that in the USA, the bolt size is often described as being the size of the wrench for that bolt (10 mm bolt, 13 mm bolt etc. meaning actually M6 bolt and M8 bolt respectively). This way of stating the bolt size (by the size of its hex head) is not really precise. You can have an M6 bolt with a 10 mm head and also with an 8 mm head. Similarly, there are M8 bolts with a 10 mm or 12 mm hex head in addition to the usual 13 mm.
     
  12. steved033

    steved033 F1 World Champ
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    #12 steved033, May 28, 2019
    if you haven't installed it, consider a drop of red loctite on the acorn nut that holds the impeller on.

    sjd
     
  13. 348steve

    348steve Karting

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    #13 348steve, May 28, 2019
    I agree, it was really perplexing. I started off by imagining the bolt I was just about to drive was 10mm as in M10. That graph converted to 34ft-lb on my English torque wrench. I looked at myself and said no freaking way - that would twist the threads lit licorice. With a little more investigation I figured it out before trying something stupid.
     
  14. 348steve

    348steve Karting

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    #14 348steve, May 28, 2019
    Ya, OK red loctite on the drive pulley acorn nut!

    I bought a couple of extras nuts as the one I pulled of was mutilated a bit by my home made tool.


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  15. steved033

    steved033 F1 World Champ
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    #15 steved033, May 28, 2019
    impeller nut. on the water pump impeller.
     
  16. steved033

    steved033 F1 World Champ
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    #16 steved033, May 28, 2019
  17. 348steve

    348steve Karting

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    #17 348steve, May 28, 2019
    Oh interesting, I do have one of those new pumps! Has there been reports of these acorn nuts coming off?

    Thanks for the heads up!
     
  18. steved033

    steved033 F1 World Champ
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    #18 steved033, May 28, 2019
    I know of a possible one. There's no guarantee that was it, but that's what was found when the car was pulled back apart. I was told it wouldn't hurt to do mine. There was no evidence of any locking compound in there.

    sjd
     

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