355 Cam belt tensioner, question... | FerrariChat

355 Cam belt tensioner, question...

Discussion in 'Technical Q&A' started by Mr Dobermann, Nov 5, 2008.

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  1. Mr Dobermann

    Mr Dobermann Karting

    Joined:
    Jul 31, 2005
    Messages:
    162
    I removed the engine out from my 355 yesterday, and found one thing a little strange. The cam belt at bank 5-8 was not sitting tight at all, it had a lot of play.

    What is best to do at this point? Just adjust the tensioner or? HOW do i do this the proper way at this stage, when the belt has been sitting for apx 1000-2000 km? The belts were changed just a while ago(spring -08)), so i found this a bit strange. Does the tension on the belts change depending on the phase of the motor(opening-closing valves)? Can the hydraulic tensioner be worned out on this side maybe?

    By the way, the cam belt on bank 1-4 was on the other hand really tight...

    Thankful for help.

    Kimmo/Sweden.
     
    Mr Dobermann, Nov 5, 2008
    #1
  2. No Doubt

    No Doubt Seven Time F1 World Champ

    Joined:
    May 21, 2005
    Messages:
    72,740
    Location:
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    As a general rule of thumb, when belts are too tight they cause bearing damage, and when too loose they allow slippage. Some cam belts (e.g. 348) are allowed to be tightened *once* in their lifetime after 800 miles of driving from initial installation.

    You definitely want to measure, verify, and use the proper torque.
     
    No Doubt, Nov 5, 2008
    #2

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