Calling the Stooges: 348 Transmission Possble Problem | FerrariChat
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Calling the Stooges: 348 Transmission Possble Problem

Discussion in 'Technical Q&A' started by Brewman, Nov 8, 2014.

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  1. Brewman

    Brewman Formula Junior

    Apr 3, 2012
    417
    NC Mountains @ Boone
    Full Name:
    Joe
    #1 Brewman, Nov 8, 2014
    Last edited: Nov 8, 2014
    I have noticed that if I suddenly let off the gas I get a definite clunk from the right hand axle area that sounds like it is coming from the area of item Since I have the engine out for a major now is the time to check further. If I rotate each axle back and forth the LH side has no lost motion, conversely the RH side has a inch or more and a definite clunk that sounds like it is coming close to item 4 on the attached drawing.

    Before proceeding I would appreciate some recommendations from the FChat brain trust on the likely cause and how to correct. When I drained the gbox there was zero metal on the plug. I also poured the fluid thru a rag and did not see anything suspicious.

    My initial guess is bearing #3 on the attached drawing is failing.

    Greatly appreciate any suggestions and, if possible links to a repair procedure. I have read multiple postings on transmission problems but have not found anything that sounds like my concern.

    Thanks,

    Brewman


    Ferrari 348 Parts : Table 33 - DIFFERENTIAL AND AXLE SHAFT
     
  2. ernie

    ernie Two Time F1 World Champ
    Lifetime Rossa Owner

    Nov 19, 2001
    22,620
    The Brickyard
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    The Bad Guy
    #2 ernie, Nov 11, 2014
    How are your motor mounts? How about the bushings, what condition are they in?
     
  3. walnut

    walnut F1 Rookie
    Silver Subscribed

    Aug 14, 2006
    3,092
    Maryland, USA
    Full Name:
    Rich
    #3 walnut, Nov 11, 2014
    I am an expert by absolutely no means whatsoever, but, are you sure its not coming from one of the universal joints on the axle? It looks like there's two per half-shaft in the picture you linked. They'd be the type of thing that could get play and "clunky" fairly easily.
     
  4. vvassallo

    vvassallo F1 Veteran

    Aug 4, 2006
    8,329
    Palos Verdes
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    Vince V
    #4 vvassallo, Nov 12, 2014
    I though U-joints immediately. Typical symptom. Probably not internal. Simplest explanation usually the best.
     
  5. 2NA

    2NA F1 World Champ
    Consultant Owner Professional Ferrari Technician

    Dec 29, 2006
    18,221
    Twin Cities
    Full Name:
    Tim Keseluk
    #5 2NA, Nov 12, 2014
    The half-axles have Constant Velocity joints, not U-joints. It's unusual for C/V joints to "clunk". It is possible that the bolts (#7) securing them to the flange can come loose if not tightened properly.
     

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