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Engine whines belt durability

Discussion in '360/430' started by raywong, Jul 17, 2010.

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  1. raywong

    raywong Formula Junior

    Aug 29, 2004
    673
    Hong Kong
    Full Name:
    Raymond
    #1 raywong, Jul 17, 2010
    I went to a trackday a few months ago, after all the hard driving, the car developed a faint whining noise coming from my engine. It was pitch dependent, starting at 2600 rpm and disappear at 4400 rpm. My mechanic found out it was caused by vibration of the alternator belt which was lose due to stretching. He tightened it and all noise were gone.
    3 months passed... I don't drive this car a lot, but the whines has came back after a few hard drives recently. Apparently the belt is stretched again! I am a bit worry about the durability of these belt, specially if the timing belt is made of the same material.
     
  2. chrmer3

    chrmer3 Formula 3

    May 19, 2006
    1,719
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    Chris
    #2 chrmer3, Jul 18, 2010
    Last edited: Jul 18, 2010
    Could it be a bad bearing in the alternator and tightening the belt temporarily masked it? Also was the belt originally tightened by a hertz frequency? If not maybe that is why- either to tight (causing premature bearing failure) or too loose causing the belt too sing? Just a guess but least you know exactly where to look for issue.
     
  3. DonJuan348

    DonJuan348 F1 Rookie
    Owner

    Aug 5, 2008
    4,442
    Taxing Jersey
    #3 DonJuan348, Jul 18, 2010
    why is a frequency meter need to adjust belts? I always measure the top to bottom movement for correct tension.
     
  4. Euromog

    Euromog Karting

    Apr 5, 2009
    102
    Oakhurst, CA
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    John Wessels
    #4 Euromog, Jul 18, 2010
    Even when installing a new altenator belt with a service to the factory spec I have had it stretch over night and become loose. Then had to adjust the tension again. If you have a belt on any car that keeps stretching after several adjustments I would suggest replacing it. Not on a Ferrari but I have had a few new belts over the years that made better rubber bands than a drive belt. Only fix was to replace them.
     
  5. chrmer3

    chrmer3 Formula 3

    May 19, 2006
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    #5 chrmer3, Jul 18, 2010
    Ask Ferrari, its right in the service manual....

    Timing belt:190-210hz
    AC belt: 131-145hz
    Alternator/Water pump: 90-100hz
    steering pump: 90-100hz
     
  6. SpecialK43

    SpecialK43 Karting

    Oct 12, 2007
    198
    Kzoo, MI
    Full Name:
    K Russell
    #6 SpecialK43, Jul 18, 2010
    Are you supposed to pluck the belt itself and measure the frequency?
     
  7. chrmer3

    chrmer3 Formula 3

    May 19, 2006
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    Chris
    #7 chrmer3, Jul 18, 2010
    Yes. On another recent post named frequency meter for timing belt service I found a hz meter that is a bargain at $250. I checked it's accuracy and it is dead-on or off 1 hz at the most!
    Chris
     
  8. highpower

    highpower Rookie

    Jul 20, 2010
    1
    #8 highpower, Jul 20, 2010
    what model car do you have?
     
  9. TheMayor

    TheMayor Ten Time F1 World Champ
    Rossa Subscribed

    Feb 11, 2008
    106,168
    Vegas baby
    #9 TheMayor, Jul 20, 2010
    Just because the timing belt is also made of rubber doesn't mean they are "the same". They have a completely different construction and have completely different forces acting on them.

    But, if you're concerned the timing belts would have the same problem, they are really apples and oranges.
     

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