Valve Gearing (timing) | FerrariChat
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Valve Gearing (timing)

Discussion in '206/246' started by Erbe, Apr 9, 2020.

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  1. Erbe

    Erbe Rookie

    Apr 9, 2020
    2
    Full Name:
    Eduardo Bergamini Erbe
    #1 Erbe, Apr 9, 2020
    Hi, i'm trying to time the camshafts of my Dino 246 GT 1973 engine but I'm confused with the camshaft marks. Thera are two marks at the camshaft "head", where the driven gear is fixed, distanced 180 degres from each other. One with one dot and the other with two dots.
    At the whorkshop manual that I have it only relates to a "mark" at the camshaft, it does not says which one.
    Can anybody help on that?
    Thanks!
     
  2. TonyL

    TonyL F1 Rookie

    Sep 27, 2007
    4,159
    Norfolk - UK
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    Tony
    #2 TonyL, Apr 10, 2020
    On EACH camshaft there is only one mark and this must align up exactly with the marks on the camshaft end caps when the engine is at TDC (firing). A small dab of red paint helps to highlight them. Although i have found the plate near the crankshaft to be accurate it is worth checking the engine is at TDC via the spark plug hole and a dial gauge.
    Tony
     
  3. daviekj

    daviekj Formula Junior
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    May 9, 2008
    483
    UK
    #3 daviekj, Apr 10, 2020
  4. Erbe

    Erbe Rookie

    Apr 9, 2020
    2
    Full Name:
    Eduardo Bergamini Erbe
    #4 Erbe, Apr 13, 2020
    Thank you very much guys! I end up finding out that the camshafts that I have are not original... and that explains all.
     
  5. 74Fiats

    74Fiats Rookie

    Sep 20, 2020
    34
    Sarasota, FL
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    John Mishriky
    #5 74Fiats, May 5, 2025 at 8:23 PM
    Hello, I am running into the exact same issue as Erbe did ... my camshafts have 1 and 2 dots, not a single mark as described in the manual. Can anyone assist with the proper positioning of these apparently aftermarket cams? I believe the "1 dot" mark is used as the mark for the intake cam, and the "2 dots" mark is used for the exhaust cam, but I would rather be certain than speculate! Thanks in advance on any knowledge of these cams.
     
  6. TonyL

    TonyL F1 Rookie

    Sep 27, 2007
    4,159
    Norfolk - UK
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    Tony
    #6 TonyL, May 6, 2025 at 1:34 AM
    Photo?

    There shouldnt be any "dots" see post 3 for the slot mark on the cam and corresponding slot on the cam end cap, when aligned all four cams marks should be aligned exactly.

    If you are unsure that these marks are accurate then you will need to degree time the cams using a degree wheel.

    A search on this forum will help as its a lengthy process that needs accuracy to get right.

    Tony
     

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