Valve timing 308 gtsi | FerrariChat
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Valve timing 308 gtsi

Discussion in 'Technical Q&A' started by [email protected], Oct 13, 2015.

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  1. fhjodavis@aol.com

    [email protected] Rookie

    Sep 24, 2015
    1
    #1 [email protected], Oct 13, 2015
    Hi we are new members and we have a 81 308 gtsi and a 79 308 gts.

    We are doing a major service on the gtsi . Our cam shaft timing marks do not line up with the marks on the bearing caps when the engine is at top dead center on cylinders 1-4 (all 4 cams seem slightly advanced)

    Question? when we install new timing belts, can we line up all the marks and dispense with the complete degreeing process.

    Thanks for any comments Appreciate the feedback
     
  2. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,671
    San Carlos, CA
    Full Name:
    Mitchell Le
    #2 yelcab, Oct 14, 2015
    Technically, you install new timing belts, with all the marks lined up, then you pull out the degree wheel to get to the final positions. Off the records, the 2V engine is not that sensitive so if you get the marks to line up after the belts are on, you would be good to go.
     
  3. Meister

    Meister F1 Veteran
    Silver Subscribed

    Apr 27, 2001
    5,516
    Duluth, MN
    Full Name:
    The Meister
    #3 Meister, Oct 14, 2015
    most do not consider just changing belts a major service. are you doing more?
     
  4. Glassman

    Glassman F1 World Champ
    Rossa Subscribed

    Apr 23, 2002
    15,247
    Montana, Oregon, Hawaii
    #4 Glassman, Oct 14, 2015
    If he can see the timing marks ( valve covers off) wouldn't you assume there is deeper surgery going on?
     
  5. mwr4440

    mwr4440 Five Time F1 World Champ
    Rossa Subscribed

    Jun 8, 2007
    58,067
    Bavaria, The 'Other' Germany
    Full Name:
    Mark W.R.
    #5 mwr4440, Oct 16, 2015
    If it is your car, degree it.

    Then you know exactly were it sits with all 4 cams.

    My 2-Cents EU.
     
  6. Ferrari Tech

    Ferrari Tech Formula 3

    Mar 5, 2010
    1,231
    Georgia
    Full Name:
    Wade Williams
    #6 Ferrari Tech, Oct 19, 2015
    If it ran well before you got into it, then it will run well if you replace the belts and not move anything. If you have no experience with cam timing, just change the belt and enjoy your car. I have seen a number of Ferrari engines that the marks are not perfect but the numbers are right after degreeing.
    Also, don't be surprised if the marks are a little closer after the new belt is on. A little belt stretch can make a big difference, again, just mark it and change the belts.
    Drive on.


     

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