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360 Belt sounds

Discussion in '360/430' started by Kitchdog, Jan 27, 2020.

  1. Kitchdog

    Kitchdog Karting

    Jan 10, 2019
    150
    Full Name:
    Ryan
    Hi all,

    have a 2001 360 Spider - i have had it for 8 months now and it had the belts done before I took over ownership (seen all receipts).

    I have always noticed what sounds like a belt noise, it doesn’t sound wrong as such, but is it normal for me to be able to hear at least one of the belts moving around doing it’s thing? I really only drive with the roof down so this could be the reason I am more aware of it. It’s like a whirring/chirping sound and I don’t hear it all the time.

    Anyone experience anything similar?

    thanks
     
  2. Bob in Makiki

    Bob in Makiki Formula Junior
    Silver Subscribed Owner

    May 30, 2017
    362
    Honolulu
    Ryan: I have a 2003 360 Spider. I don’t notice any sound that I would identify as a belt sound. I would suggest you take the car to a good 360/mechanic and have them listen to it. Or, join your local chapter of the FCA and see for yourself what other 360s sound like. Good luck!
     
  3. Kitchdog

    Kitchdog Karting

    Jan 10, 2019
    150
    Full Name:
    Ryan
    Thanks Bob. I’m going to try and pinpoint the exact conditions in which I hear this sound and get it looked at. It could be wind noise for all I know but I doubt it.
     
  4. Mimmo Blue

    Mimmo Blue Formula Junior

    Apr 17, 2018
    255
    Stoney Creek, Ontario, Canada
    Full Name:
    Dom
    Why not just remove your access cover behind your seats? You will get a better idea of exactly which belt it is
     
  5. Kitchdog

    Kitchdog Karting

    Jan 10, 2019
    150
    Full Name:
    Ryan
    great idea thanks mate. Will do that for next drive.
     
  6. Oengus

    Oengus F1 Veteran
    Rossa Subscribed

    Sep 29, 2004
    7,822
    Between timing belts or OH, SC, CO, CT
    Full Name:
    Chas
    Probably just air getting sucked in the side vents
     
  7. Kitchdog

    Kitchdog Karting

    Jan 10, 2019
    150
    Full Name:
    Ryan
    I wouldn't be surprised if this was the case to be honest, I am a worry wart when it comes to this car!!
     
    Oengus likes this.
  8. frankgoodson

    frankgoodson Rookie

    Dec 25, 2008
    34
    When I had my 360, I didn't hear anything like that. You should show it to your mechanic.
     
  9. Oengus

    Oengus F1 Veteran
    Rossa Subscribed

    Sep 29, 2004
    7,822
    Between timing belts or OH, SC, CO, CT
    Full Name:
    Chas
    coupe or cab?
     
  10. Bill ochrane

    Bill ochrane Karting

    Oct 26, 2018
    149
    Galveston, Texas
    Full Name:
    William Cochrane
    Chirping? It could be one of the belt idler bearings. Easily fixed by independent shop for about $150 or at a Ferrari dealership for about $6,000. LOL
     
    Apollo 11 likes this.
  11. yelcab

    yelcab F1 Veteran
    Consultant

    Nov 29, 2001
    9,923
    San Carlos, CA
    Full Name:
    Mitchell Le
    That is not fair. It depends on the idler bearing. If it is the timing belt tensioner bearing then it is expensive. If it is one of the smaller anti-skip bearings then it is just a couple hundred bucks. Getting to the access panel is 50% the work.
     
  12. imahorse

    imahorse Formula Junior

    Nov 25, 2017
    292
    WI
    Full Name:
    Dustin
    The serpentine, AC, and PS belts have an odd way of having their tension being measured. You may just have a loose belt.
     
  13. Mimmo Blue

    Mimmo Blue Formula Junior

    Apr 17, 2018
    255
    Stoney Creek, Ontario, Canada
    Full Name:
    Dom
    Belt tension is measured by listening to the frequency of the belt when you pluck it at a specific point.
    I used the app by Gates called Carbon Drive on my phone. I had to remove my alternator belt when changing headers. I used the app to measure the frequency before removing the belt, which was within specifications, then re-installed to the same frequency.
     
  14. Kitchdog

    Kitchdog Karting

    Jan 10, 2019
    150
    Full Name:
    Ryan
    It’s not so much a chirping or a squealing, but more of a frequent whooshing/wind sound. Doesn’t happen at idle.

    Will get my Mrs to try and film/record it next time.

    Next service due in May, might bring it forward a month or so.
     
  15. Neil22

    Neil22 Karting
    Silver Subscribed

    Nov 4, 2018
    83
    Oxford CT
    Full Name:
    Neil Silberkleit
    if the belts are too tight they can make some noise especially when cold.
    if they are too loose they can squeak until the belt warms up or under hard acceleration.
    Below are the specs from the service manual section A 3.04
    Alt belt 90 - 100 Hz adjustment is from under the car.
    AC belt 131 - 145 Hz
    Power Steering pump belt 90 - 100 Hz
     
  16. Kitchdog

    Kitchdog Karting

    Jan 10, 2019
    150
    Full Name:
    Ryan
    thanks for your reply Neil, appreciated!
     
  17. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    2,162
    Berkeley, CA
    Full Name:
    Brian Brown
    Those specifications are incorrect, and will lead to the P/S belt being too loose. It will squeal badly when the car is cold. Ferrari revised the belt tension in the 360 CS manual. The correct tension for the P/S belt is 216Hz

    Brian Brown
    San Francisco Motorsports
     
  18. Mimmo Blue

    Mimmo Blue Formula Junior

    Apr 17, 2018
    255
    Stoney Creek, Ontario, Canada
    Full Name:
    Dom
    Is the alternator spec correct at 90-100 Hz?
    I measured mine before I removed it and it was around 95 Hz. The belt was last serviced a year before by Ferrari dealership and has about 1500 km on it
     
  19. Neil22

    Neil22 Karting
    Silver Subscribed

    Nov 4, 2018
    83
    Oxford CT
    Full Name:
    Neil Silberkleit
    Brian - thanks for the update - I will make a note of this and keep it with my other updates as I learn more.
     
  20. Kitchdog

    Kitchdog Karting

    Jan 10, 2019
    150
    Full Name:
    Ryan
    Okay so after a few drives this weekend I think I’m hearing two different things.

    When stopped at the lights I think I can hear what is definitely one of the belts. Sort of comes and goes but can be heard at idle doing it’s thing. Might need to be tightened.

    The other sound which is what I was trying to describe in the OP is more of a subtle clicking which is easier to hear when car is under throttle and warmed up. Almost sounds like when you stuck sports cards on your bicycle spokes as a child, but not as loud as that.

    I’m not getting any CEL’s, and the car is driving fine. Think I’ll bring the May service ahead to March.
     
  21. Autohaus of Boston

    Regional Sponsor

    Sep 11, 2017
    139
    20 Mill lane Braintree MA 02184
    Full Name:
    Tony Fernandes
    Early 360 models the drivers side timing belt hydraulic tensioner has been revise do to failure coming loose from the bracket causing the noise you describe !!
     
  22. Kitchdog

    Kitchdog Karting

    Jan 10, 2019
    150
    Full Name:
    Ryan
    hmmm...the tensioners were replaced in May. Thanks for the reply mate - think it’s best I get it looked at, will keep his thread updated.
     
  23. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    2,162
    Berkeley, CA
    Full Name:
    Brian Brown
    Yes, alternator spec is correct at 90-100Hz. But those specs are for brand new belts. The tension on a used belt will usually be less. I am surprised that your belt was still at 95Hz. If I have to reinstall a used belt, I check the tension first and then reinstall it to the same tension, unless it is way off of the specification.

    Brian Brown
    San Francisco Motorsports
     
  24. Mimmo Blue

    Mimmo Blue Formula Junior

    Apr 17, 2018
    255
    Stoney Creek, Ontario, Canada
    Full Name:
    Dom
    Yes that is what I did, measured before removal then rei-nstalled to the same tension. I would be surprised if the tension was off since new belts only had 1500km, about 900 miles on them
     

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