Timing chain adjustment | FerrariChat

Timing chain adjustment

Discussion in '365 GT4 2+2/400/412' started by miami355, Nov 19, 2018.

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  1. miami355

    miami355 Karting

    Sep 2, 2006
    136
    Miami, FL
    #1 miami355, Nov 19, 2018
    Does anyone have a link to instructions on timing chain adjustment? I am getting some noise when engine is cold, and I'd like to see if there is any adjustment left. I am almost thinking just to change it as a preventative measure. Can this be done with engine in? Any estimates on costs?


    David
     
  2. Part Time

    Part Time Formula Junior
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    Dec 16, 2013
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    Port St. Lucie, Fl
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    Gary Shore
    #2 Part Time, Nov 19, 2018
    There are many existing threads about adjustment/replacement of the timing chain, click the search button, click "more", type in "chain", select our group in the forum list....10 pages of threads all about the process, engine in/out, type/manufacture of chain, how to adjust, etc.
    Sorry, not trying to be a smart***, but the subject has been completely covered in previous threads.

    Gary
     
  3. raemin

    raemin Formula 3

    Jan 16, 2007
    1,859
    Lyon (FR)
    Full Name:
    R. Emin
    #3 raemin, Nov 19, 2018
    To answer the question: yes replacing the chain can be done with engine in. As for tension, assuming yours is a 400i, as a starting point read the owner manual page 71 (hosted on the Ferrari 400 register website). The detailed procedure is further specified in the workshop manual page B40 & B41 (hard to find online).

    So read the manuals then search the forum.

    If you do not have the workshop manual just drop me a private message (but be patient...).
     
  4. miami355

    miami355 Karting

    Sep 2, 2006
    136
    Miami, FL
    #4 miami355, Nov 19, 2018
    I hate to be that guy, and I did search and find procedure, the gist of it being better a little too loose, then a little too tight. Was mostly looking for the actual location of the adjuster. I didn't see the adjuster after taking a quick look, or a see a diagram. No worries, I'll keep searching.
     
  5. Part Time

    Part Time Formula Junior
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    Port St. Lucie, Fl
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    Gary Shore
    #5 Part Time, Nov 19, 2018
  6. Ak Jim

    Ak Jim F1 Veteran
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    Dec 23, 2007
    8,491
    North Pole AK
    #6 Ak Jim, Nov 19, 2018
    How much of the adjusting screw can you see? Is there an inch, 1/2 inch or nothing? If you have some adjustment available then try 1/2 turn to one turn and see how it sounds. Some of the literature talks about tightening it down while the engine is running until it gets noisy then back it off a little, I have to wonder if this might be too much.
     
  7. rovexienus

    rovexienus Formula Junior
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    Jun 10, 2010
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    Jean-Michel Savary
    #7 rovexienus, Nov 19, 2018
    Hello,

    Please have a look at:

    https://www.ferrarichat.com/forum/threads/archive-f400-club-forum-timing-chain-tension-adjuster.584311/

    Please be cautious about instructions on page B41 of the english WSM about timing chain tension adjustment, these instructions have been incorrectly translated from Italian.

    With engine running at idle, the correct procedure (correctly translated from Italian) is to tighten the adjusting screw until the chain stops being noisy, then back-off a quarter of a turn, then tighten the lock nut.
     
    Attila400 likes this.
  8. Ak Jim

    Ak Jim F1 Veteran
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    Dec 23, 2007
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    #8 Ak Jim, Nov 20, 2018
    Thanks for the clarification.
     

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