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456M screech on start up

Discussion in '456/550/575' started by KeithS, Aug 1, 2019.

  1. KeithS

    KeithS Karting
    Silver Subscribed

    Dec 30, 2008
    146
    Paradise Valley, AZ
    Full Name:
    Keith Stephens
    My car is 1999 456M, 6 speed, 73,000 miles, major service 2/2017, tension bearings and motor mounts upgraded to 575 models. I am in Phoenix, AZ.

    At cold start the car has developed a very loud screech on that usually last for only a few seconds. Lately the screech has lasted longer, maybe 30 seconds, and becomes louder with increase in rpm. On restart there is no screech. It sounds to me like a bearing going dry. Accessory belts have been adjusted and the screech occurs with the AC off.

    Any thoughts or suggestions appreciated.

    Keith
     
  2. Joey4420

    Joey4420 Rookie

    Apr 6, 2018
    38
    Hamilton, Ohio
    Full Name:
    Joey Shreve
    Have you tried using a mechanics stethoscope to listen as it is started?
     
  3. AVIMAX

    AVIMAX Formula Junior

    Aug 5, 2014
    399
    Toronto
    Full Name:
    Ryan
    My 550 developed a screech on startup. Initially it was only once in a while, but got worse. It was my clutch release bearing.
     
    Joey4420 likes this.
  4. KeithS

    KeithS Karting
    Silver Subscribed

    Dec 30, 2008
    146
    Paradise Valley, AZ
    Full Name:
    Keith Stephens
    My car is 1999 456M, 6 speed, 73,000 miles, major service 2/2017, tension bearings and motor mounts upgraded to 575 models. I am in Phoenix, AZ.

    At cold start the car has developed a very loud screech on that usually last for only a few seconds. Lately the screech has lasted longer, maybe 30 seconds, and becomes louder with increase in rpm. On restart there is no screech. It sounds to me like a bearing going dry. Accessory belts have been adjusted and the screech occurs with the AC off.

    Any thoughts or suggestions appreciated.

    Keith
     
  5. killer58

    killer58 Formula 3
    Silver Subscribed

    Jun 30, 2010
    1,103
    CA & DC
    Alternator / water pump maybe?
     
  6. killer58

    killer58 Formula 3
    Silver Subscribed

    Jun 30, 2010
    1,103
    CA & DC
    Alternator / Water Pump maybe ??
     
  7. tazandjan

    tazandjan Three Time F1 World Champ
    Owner Lifetime Rossa

    Jul 19, 2008
    30,960
    Albuquerque, NM
    Full Name:
    Terry H Phillips
    Get a piece of hose and try to locate the source at start-up. Unless the temperature is below 59 F, there is a good chance the AC compressor is on regardless of the setting. At least it is in a 575M.
     
  8. bergxu

    bergxu Formula 3

    Aug 16, 2005
    1,302
    OnTheSerpentMound
    Full Name:
    Aaron
    Does it seem that the noise is emanating from the front of the engine? I’d remove the belts from all of the ancillaries and fire it up just briefly and see if the noise goes away. That’ll narrow it down quite a bit at least. Obviously don’t run it for more than 10-15 seconds since you won’t have water circulation. But before firing it up, spin all pulleys and see if you hear and/or feel anything abnormal.


    Sent from my iPhone using FerrariChat
     

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