Rattling noise in 348 Engine | FerrariChat
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Rattling noise in 348 Engine

Discussion in 'Technical Q&A' started by Jagbuff, Dec 5, 2006.

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  1. Jagbuff

    Jagbuff Formula 3

    Jan 13, 2004
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    Franck
    #1 Jagbuff, Dec 5, 2006
    I have noticed that on start up when cold the is sound like a rock lightly bouncing around, after 2-3 minutes the sounds goes away. I know it is not the clutch as this is distinctly in the front. Any suggestions, water pump, idler bearings?

    I have been planning a major... maybe sooner than later now...
     
  2. plugzit

    plugzit F1 Veteran
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    Dec 1, 2004
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    Bruce Bogart
    #2 plugzit, Dec 5, 2006
    Yep, it's time. Bearing noise? Water pump? Hopefully, just an alternator bearing, but should be immediately isolated, identified, and dealt with at risk of great expense.
     
  3. Miltonian

    Miltonian F1 Veteran

    Dec 11, 2002
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    Jeff B.
    #3 Miltonian, Dec 5, 2006
    It's at least possible that it's just a glazed spot on the alternator belt or the A/C belt. A simple test is to spray a little water down there in the area of the front of the engine, while you are hearing the noise. You don't have to really douse it, you can even soak a shop rag with water and just squeeze it over the belt area, between the engine and the firewall. The noise will temporarily stop right away if it's just a belt, but it will come back again. If there is a problem with the water pump, or the idler/tensioner bearings, this will have no effect on the noise.

    Personally, I would think that if you had a problem with the water pump or the bearings, the noise would NOT go away as the engine warmed up. It should be taken seriously until you pinpoint the cause.
     
  4. Ricambi America

    Ricambi America F1 World Champ
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    Dec 7, 2003
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    #4 Ricambi America, Dec 5, 2006
    Could also be oil pump bearings. I would stop driving, and start diagnosing.

    What year is your car? What is the assembly number/VIN (last 5 digits) ?
     
  5. No Doubt

    No Doubt Seven Time F1 World Champ

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    #5 No Doubt, Dec 5, 2006
  6. Ricambi America

    Ricambi America F1 World Champ
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    Dec 7, 2003
    16,464
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    #6 Ricambi America, Dec 5, 2006
    ^^ he has a 348, not a 355.

    dp
     
  7. No Doubt

    No Doubt Seven Time F1 World Champ

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    #7 No Doubt, Dec 5, 2006

    Similar cam belt tensioners, though.
     
  8. Llenroc

    Llenroc F1 Veteran
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    #8 Llenroc, Dec 5, 2006
    Actually they are completely different. The bearings are similar in concept but tensioners are very different.
     
  9. fatbillybob

    fatbillybob Two Time F1 World Champ
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    #9 fatbillybob, Dec 5, 2006
    check timing gear bearings buried in engine not timing tensioner bearing
     
  10. rosso tweeks

    rosso tweeks Rookie

    Aug 24, 2006
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    JOHN
    #10 rosso tweeks, Dec 5, 2006
    If your car is an early 348, the cam belt drive shaft bearings could be the problem. There is an update.
     

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