Head Resurfacing Tolerance 1987 Testarossa | FerrariChat

Head Resurfacing Tolerance 1987 Testarossa

Discussion in 'Boxers/TR/M' started by Muriel, Dec 7, 2022.

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  1. Muriel

    Muriel Rookie

    Jul 2, 2012
    14
    #1 Muriel, Dec 7, 2022
    What is the max amount removed ?
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    25,149
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Dec 7, 2022
    From page B28 of the TR WSM: "If head resurfacing is necessary, do not machine below the height value indicated in fig. 23."

    Fig. 23 (on page B25): overall thickness (height) of cyl head = 125.20 mm maximum, 125.10 mm minimum
     
  3. Muriel

    Muriel Rookie

    Jul 2, 2012
    14
    #3 Muriel, Dec 8, 2022
     
  4. Muriel

    Muriel Rookie

    Jul 2, 2012
    14
    #4 Muriel, Dec 8, 2022
    Perfect , Thank You !
     
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    25,149
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #5 Steve Magnusson, Dec 8, 2022
    Please post the thickness (height) of your cyl head(s) before machining. I would hope that F targeted the maximum value when they were made as even from that value there isn't much material available to remove. If F targeted the middle nominal value = that could be trouble...
     
  6. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    8,934
    southwest germany and thailand
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    romano schwabel
    #6 turbo-joe, Dec 8, 2022
    if you have to remove more then you would need a thicker and special headgasket. but remember both sides have to been equal
     
  7. Muriel

    Muriel Rookie

    Jul 2, 2012
    14
    #7 Muriel, Dec 9, 2022
    It does appear that the head may have come from original build with the nominal value . We might be looking for a new head ( right side 1-6 ) Will be doing more measurements from various areas and post thickness values next week . Once again, Thank You !
     
  8. Veedub00

    Veedub00 F1 Rookie
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    Jun 30, 2006
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    Troy, Michigan
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    James
    #8 Veedub00, Dec 10, 2022
    What happened to the head? Haven’t heard too many folks doing this.
     
  9. Muriel

    Muriel Rookie

    Jul 2, 2012
    14
    #9 Muriel, Dec 11, 2022
    Long story short , my own incompetence and failure to think through the entire head removal process methodically In the end, I fabricated an effective head remova
     
  10. Muriel

    Muriel Rookie

    Jul 2, 2012
    14
    #10 Muriel, Dec 11, 2022
    Sorry about that , still making mistakes . Shaved the head through a dumb choice and now in the process of having someone more competent than myself to fix it . Live and learn… still learning . Thank you for all the wise input !
     
  11. Muriel

    Muriel Rookie

    Jul 2, 2012
    14
    #11 Muriel, Dec 17, 2022
    Before machining , the thickness ( height) is 4.905” / 124.6mm . Considering a Clark Copper racing gasket to make up the .020”/ .5mm needed to get to 4.925”/ 125.1mm
    Any thoughts ? Cheers !
     
  12. Gleggy

    Gleggy Formula 3

    Sep 22, 2004
    1,449
    Land of Oz
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    #12 Gleggy, Jan 15, 2023
    We can manufacture a set of purpose built 2mm thick gaskets for you to suit the TR. Normal thickness is 1.5mm. This may give enough height to get clearance.
    if this helps let me know.
    Murray
     
  13. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    34,119
    Austin TX
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    Brian Crall
    #13 Rifledriver, Jan 16, 2023
    Prior to reassembly be sure there is not a cam bearing alignment issue.
     
    turbo-joe likes this.

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