308QV Mondial engine "clatter" at 2500 revs | FerrariChat

308QV Mondial engine "clatter" at 2500 revs

Discussion in '308/328' started by keithjallen, Apr 28, 2016.

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  1. keithjallen

    keithjallen Rookie

    Feb 19, 2004
    25
    Surrey England
    Full Name:
    Keith Allen
    I have just replace the cambelts and tensioners on my 1984 Mondila 308 QV. When driving there is a "clatter" from the engine area at around 2500 rev when the engine is under load. I also changed the oil with Shell Helix HX7 5W/30. Any thoughts on my "clatter" welcome. It sounds almost like the sound you get when small ends are worn. Could the oil be too thin?

    Thanks. Keith
     
  2. GordonC

    GordonC F1 Rookie
    Owner Rossa Subscribed

    Aug 28, 2005
    4,163
    Calgary, AB, Canada
    Full Name:
    Gordon
    For starters, I would think the oil is too thin. On the 3.0 QV, factory spec is synthetic 10W50 AGIP. Some forum members will go with a synthetic xW40 (eg Mobil1 0W40, Pennzoil 5W40), but I don't believe anyone recommends or runs a xW30.
     
  3. Crowndog

    Crowndog F1 Veteran

    Jul 16, 2011
    7,042
    Fairfield,Pa
    Full Name:
    Robert
    Something is loose? Heat shield, exhaust manifold shielding, sampling tubes, belt cover, muffler, cat, Etc. Also an exhaust leak can sound similar.


    Sent from my iPhone using Tapatalk
     
  4. keithjallen

    keithjallen Rookie

    Feb 19, 2004
    25
    Surrey England
    Full Name:
    Keith Allen
    I think I will change the oil! Thanks for the advice.
     
  5. waymar

    waymar Formula 3

    Sep 2, 2008
    1,354
    Northeast, PA - USA
    Full Name:
    Wayne Martin
    I use valvoline VR1 20/50
     
  6. FerrariMech1

    FerrariMech1 Karting

    Dec 14, 2014
    78
    Dayton, OH
    Full Name:
    Michael Wilson
    We gotta remember here, the cam belts were replaced and the oil was not touched. If the issue did not exist before the belts were changed and suddenly started AFTER the belts were changed, chances are: something got screwed up during the process.

    Lets start from the top...
    Did you have the belts replaced professionally? or by yourself?

    Was the service performed engine out? or in the car?
     
  7. miketuason

    miketuason F1 World Champ
    Owner Silver Subscribed

    Feb 24, 2006
    15,810
    Cerritos, CA.
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    Mike
    The PO said he also change the the oil with Shell Helix HX7 5w/30
     
  8. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,550
    Scottsdale AZ
    Full Name:
    Stu Boogie
    I just changed my belts. The number of things you disassemble in the process left me wondering why more things don't clatter so I am going with a loose or misaligned part.

    Can you get it to clatter in the garage? If yes then get a friend to hold the throttle at the clatter speed and use a stethoscope to pinpoint the clatter. My guess is the intake tunnel, ac hoses, gas tank breather canister or heat shields.
     
  9. spirot

    spirot F1 World Champ

    Dec 12, 2005
    15,115
    Atlanta
    Full Name:
    Tom Spiro
    I would think after a belt change the Clatter could be from the AC belt or Alt belt... mostly the AC belt. or if you don't have the right amount of spacers in the bracket.

    if you used a belt that is still stiff from being on the shelf you can get some slap... just need some belt conditioner.
     
  10. detroiter

    detroiter Karting

    Apr 30, 2013
    200
    Munich, Bayern
    Full Name:
    Carter
    Maybe a loose exhaust heat shield? I had that problem. Would rattle at about 3000rpm.


    Sent from my iPhone using Tapatalk
     
  11. keithjallen

    keithjallen Rookie

    Feb 19, 2004
    25
    Surrey England
    Full Name:
    Keith Allen
    Thanks to you all. I changed the oil to 10W / 50. Unfortunately no difference. I will do as suggested and start by removing the a/c drive belt to see if that changes things. Keith
     
  12. tinterow

    tinterow Formula 3

    Nov 1, 2014
    1,339
    Houston, Tx
    Full Name:
    Chaya Tinterow
    Clatter? I think we need a little better description of the noise...
     
  13. spirot

    spirot F1 World Champ

    Dec 12, 2005
    15,115
    Atlanta
    Full Name:
    Tom Spiro
    I was just in Surrey for a Wedding 1.5 weeks ago. was at the Surrey Town hall... would have loved to lend you a hand.
     
  14. FerrariMech1

    FerrariMech1 Karting

    Dec 14, 2014
    78
    Dayton, OH
    Full Name:
    Michael Wilson
    It normally helps if I read the whole post, but the first sentence and last usually get me by :)
     
  15. keithjallen

    keithjallen Rookie

    Feb 19, 2004
    25
    Surrey England
    Full Name:
    Keith Allen
    The "clatter" is a metallic noise that is in time with engine revs and occurs when engine under load e.g accelerating in any gear. Comes in at about 2500 revs. Hope this helps? K
     
  16. AndrewE

    AndrewE Karting

    Aug 29, 2008
    123
    Sevenoaks, England
    Keith
    Where in Surrey are you? I could try and pop over to have a listen
     
  17. guygowrie

    guygowrie Formula 3

    Sep 19, 2011
    1,400
    ct
    Full Name:
    guy s
    A/c hoses may have been disturbed and now resonating against metal? Try isolating them with some short sections of radiator hose, split, wrapped and zip tied around the area near where the hoses pass into the body enroute to the front of the car.

    Mine sometimes resonate around those revs and its quite metallic.
     
  18. keithjallen

    keithjallen Rookie

    Feb 19, 2004
    25
    Surrey England
    Full Name:
    Keith Allen
    Hi Andrew, I am in Horley near Gatwick Airport. K
     
  19. JohnnyTS

    JohnnyTS Formula Junior

    Jun 3, 2012
    907
    Pretoria East, RSA
    Full Name:
    John
    Hi Keith, is this a 'new ' sound after the cambelt change you mentioned ?
     
  20. keithjallen

    keithjallen Rookie

    Feb 19, 2004
    25
    Surrey England
    Full Name:
    Keith Allen
    Hi Johnny, Yes it's new. Only appeared after the cambelt change. K
     
  21. johnk...

    johnk... F1 World Champ
    Owner

    Jun 11, 2004
    11,223
    CT
    Full Name:
    John Kreskovsky
    Did you certify that cam timing was correct after the belts were changed? If one or both intake cams was advanced a tooth is it possible that you could be hearing a pre-ignition knock under load due to advanced ignition timing? Just throwing this out there.
     
  22. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,550
    Scottsdale AZ
    Full Name:
    Stu Boogie
    Can you get it to clatter just running the motor and not driving?
     
  23. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,550
    Scottsdale AZ
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    Stu Boogie
    +1. Check where the cross the fiberglass air tunnel. I used rubber tape on mine to stop some noise.
     
  24. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,550
    Scottsdale AZ
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    Stu Boogie
    +1. Check where the cross the fiberglass air tunnel. I used rubber tape on mine to stop some noise. I also have a fuel check valve that hits the ac bracket silenced with rubber tape.
     
  25. johnk...

    johnk... F1 World Champ
    Owner

    Jun 11, 2004
    11,223
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    Full Name:
    John Kreskovsky
    This seems inconsistent with the observation that it occurs "under load".
     

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