Metallic rattle at idle | FerrariChat

Metallic rattle at idle

Discussion in '308/328' started by Markie1949, Aug 25, 2005.

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  1. Markie1949

    Markie1949 Karting

    Apr 4, 2005
    82
    Utah
    #1 Markie1949, Aug 25, 2005
    I need some help with this noise that just started this week, and it seems to be getting louder. I only hear it at idle, a sort of "loose" metallic rattle that's definitely coming from the front of the engine. I have it up on a lift so I guess I could investigate further by using an automotive stethoscope, and I could pull the accessory belts to eliminate those bearings. I don't have air injection or cats, and the accessory belts are good. I replaced the timing belt this winter, @ 2000 miles ago, and at that time the tensioner bearings were inspected by F of Salt Lake and pronounced good. Now I'm worried about them. I sure don't relish pulling the gas tank again just to look. Any ideas about the source of the noise? Could the cam belt covers rattle, they seem to be secure. Can the little belt followers in the top of the cam covers rattle? Is there any way to get a feel of the timing belt tension without removing the covers? Thanks for any input.
     
  2. Markie1949

    Markie1949 Karting

    Apr 4, 2005
    82
    Utah
    #2 Markie1949, Aug 26, 2005
    Guess I've stumped all these "pro" mechanics here.
     
  3. angelis

    angelis F1 Veteran
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    Jun 18, 2004
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    #3 angelis, Aug 26, 2005
    Probably best to post it in the tecnical Q & A section.
     
  4. Miltonian

    Miltonian F1 Veteran

    Dec 11, 2002
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    #4 Miltonian, Aug 26, 2005
    Last edited by a moderator: Sep 7, 2017
    Markie: This is what you DO NOT want to find is causing your rattle, and apparently there have been multiple cases of this happening. The flange on the front of the timing belt gear breaks off due to faulty spot welds, and if it gets tangled in the belt, it causes havoc. In this case, the belt slipped and resulted in 16 bent valves.

    If you can not find a source for your noise on the outside of the belt cover, it will probably be necessary to dig into it again.

    Good luck, and report on your findings.
    Image Unavailable, Please Login
     
  5. Markie1949

    Markie1949 Karting

    Apr 4, 2005
    82
    Utah
    #5 Markie1949, Aug 27, 2005
    Oh Sh-t, thanks I guess. fuel tank pull not such a bad idea for a look see. Thank you Mr. Miltonian
     
  6. No Doubt

    No Doubt Seven Time F1 World Champ

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    #6 No Doubt, Aug 27, 2005
    That's ugly!

    Just for reference, did the belt itself survive (i.e. slipped off, but wasn't cut completely to shreds by those metal fragments)?

    Likewise, did that problem plague all models evenly, or some more than others?
     
  7. Miltonian

    Miltonian F1 Veteran

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    #7 Miltonian, Aug 27, 2005
    I'm afraid I don't know all of the details. This picture comes from a thread from 2004. The poster didn't go into specifics. I THINK I have read that there was a production change on these gears so that the flange couldn't come apart, but I honestly don't remember for sure. I suppose the dealer could check an original parts book number against a current number and see if there had been a supercede over the years.
     
  8. No Doubt

    No Doubt Seven Time F1 World Champ

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    #8 No Doubt, Aug 27, 2005
    There were some cam related production changes.
    10/10/91 cam seal housing modification—reduced oil leakage
    11/03/92 front timing bearing—reduced noise
     
  9. rivee

    rivee F1 Rookie

    Jan 20, 2002
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    #9 rivee, Dec 8, 2005
    Markie, did u ever find the rattle?
     
  10. Ken

    Ken F1 World Champ

    Oct 19, 2001
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    #10 Ken, Dec 8, 2005
    Your description sounds like heat shields around the cats, but you don't have cats....is your exhaust shielded like a cat car's?

    Ken
     
  11. No Doubt

    No Doubt Seven Time F1 World Champ

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    #11 No Doubt, Jan 17, 2006
    Any update?
     
  12. Ferrari348turbo

    Ferrari348turbo Karting

    Nov 22, 2005
    208
    Florida
    #12 Ferrari348turbo, Jan 17, 2006
    Maybe I missed something but what car is he working on? should we assume 348?
     
  13. Bullfighter

    Bullfighter Two Time F1 World Champ
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    Jan 26, 2005
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    #13 Bullfighter, Jan 17, 2006
    Profile says 348ts.
     
  14. db4

    db4 Karting

    Oct 24, 2009
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    ny
    #14 db4, Dec 8, 2009
    could also be oil pump chain tensioner may be on the way out
     
  15. CliffBeer

    CliffBeer Formula 3

    Apr 3, 2005
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    #15 CliffBeer, Dec 8, 2009
    Good thinking although somehow I suspect his problem has been solved in the intervening four years since posting....
     

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