Timing Belt Tension....normal? | FerrariChat
Buy

Timing Belt Tension....normal?

Discussion in '308/328' started by Maranelloborn, Feb 6, 2010.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. Maranelloborn

    Maranelloborn Karting

    Nov 16, 2009
    227
    New York
    Full Name:
    Remund
    #1 Maranelloborn, Feb 6, 2010
    This is a continuation of the timing belt and bearing change on my 84 Euro QV posted here. http://www.ferrarichat.com/forum/showthread.php?t=273037

    I stripped down the car and was able to pull both Timing belt covers off to examine the timing belts and tensioners. I took a couple of shots of the belts in their current state which look good. What is everyone take the slack\deflection seen in these belts with 3 years 1500 miles?

    Front Bank - http://www.youtube.com/watch?v=s68X1ExzuyY
    Rear Bank - http://www.youtube.com/watch?v=fNtGIDESoZE
     
  2. ztarum

    ztarum Formula 3

    Mar 30, 2008
    1,302
    South Jersey, USA
    #2 ztarum, Feb 6, 2010
    They do loosen as they run in, but I can't say how loose is normal. I just did mine and I was surprised by how loose they were, but I didn't have any basis for comparison so that's not worth much.
     
  3. FF8929

    FF8929 Formula Junior

    Apr 12, 2008
    799
    Livonia, Michigan
    Full Name:
    Fred Flynn
    #3 FF8929, Feb 6, 2010
    I would put some rotational force on the damper nut (CW) while checking the tension on the "pulling" side of the belts. As I recall, you're not supposed to retension the belts.
     
  4. CliffBeer

    CliffBeer Formula 3

    Apr 3, 2005
    2,198
    Seattle, Washington
    Full Name:
    Cliff
    #4 CliffBeer, Feb 7, 2010
    Interesting how Ferrari made an access hole in the belt covers to get to the tensioner bearing bolt - seems to suggest that re-tensioning the belt is an acceptable step, despite what might be said in the WSM. Unless of course, the idea here is to set an initial tension on the belt when replacing the belt, reinstall the covers, run it for a few minutes then re-tension the belt with the covers in place. HHhhmmmm....
     
  5. Martin308GTB

    Martin308GTB F1 Rookie

    Jan 22, 2003
    4,259
    Black Forest Germany
    Full Name:
    Martin N.
    #5 Martin308GTB, Feb 8, 2010
    Hello from Germany,

    this is not the common method of checking a belt's tension if you don't have special tools. A popular and well tried method is this:
    If you can twist the belt around 90° with two fingers on the driving side ( pulling side ) you're good.

    Best Regards

    Martin
     

Share This Page