348 - Metallic Ringing Noise at Front of Engine | Page 2 | FerrariChat

348 Metallic Ringing Noise at Front of Engine

Discussion in '348/355' started by Jasonberkeley, Oct 31, 2020.

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  1. 308 GTB

    308 GTB F1 World Champ
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    Barry Wolinsky
    Jason,

    Pocono Sportscar has done so much to keep my car in top form. I forgot to mention that they change the coolant and air filters annually when the gearbox oil is changed.

    Barry
     
  2. SoCal1

    SoCal1 F1 Veteran
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    Jun 14, 2011
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    Like fatboy said high freq hearing is shot and deaf in one ear. That's one strange sound sounds more external then internal
     
  3. Jasonberkeley

    Jasonberkeley Formula 3

    Apr 23, 2017
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    Its definitely external and not internal.
     
  4. 308 GTB

    308 GTB F1 World Champ
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    Jason,

    You shouldn't feel bad about having a major service done this winter. For track cars, a 3-4 year interval is best. You're at that time now.

    Barry
     
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  5. johnk...

    johnk... F1 World Champ
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    Jun 11, 2004
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    I have no idea what it is but it does sound a lot like the alternator on mt Toyota truck.
     
  6. Ferrarium

    Ferrarium F1 Veteran
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    In first pose you mentioned you did not think alternator but Its worth checking the alternator pulley sound can echo and sound like its elsewhere. If its external as you suspect its not many things.
     
  7. SoCal1

    SoCal1 F1 Veteran
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    #32 SoCal1, Nov 2, 2020
    Last edited: Nov 2, 2020
    You may get this. It sounds exactly like the open primary on my panhead. Got to be something simple.
    I know the alternator overheats and blow up a lot. If it is that add a cooling duct to it with the repair. I think I have a naca duct on all of mine to keep it cool. All those rpms make a horney alt. Also thought about a pully change to keep rpms down a wee but but never did it
     
  8. Jasonberkeley

    Jasonberkeley Formula 3

    Apr 23, 2017
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    I have an open primary on my Evo. Good call! It does indeed!
     
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  9. ernie

    ernie Two Time F1 World Champ
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    It could be anything.

    Like has been mentioned by the fatone, use a mechanics stethoscope to isolate exactly where the noise is coming from.
     
  10. Jasonberkeley

    Jasonberkeley Formula 3

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    Motor is out and front timing cover off. The serpentine belt fence on the main sprocket came off as per pic below. I had welded the fences on to the cam sprockets when motor was out for the last major three years ago. The fence on the main drive sprocket will now be welded on as well.
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  11. Ricambi America

    Ricambi America F1 World Champ
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    That looks familiar. Mine did the same thing. 32 bent valves, plus or minus a few...
     
  12. KevZep

    KevZep Formula Junior

    Feb 17, 2020
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    That welding job did not do the trick.
    The problem is the fence is a completely different metal to the sprocket so this is always going to be very difficult to weld.
    It might be better to Braze it rather than weld.
     
  13. steved033

    steved033 F1 Veteran
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    wow! dodged one!

    sjd
     
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  14. Jasonberkeley

    Jasonberkeley Formula 3

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    Yeah- for sure. After racing for years, i'm pretty paranoid about any changes in sound or new sounds. Glad I picked-up on this one as soon as it started.

    Daniel- ouch!!!
     
  15. SoCal1

    SoCal1 F1 Veteran
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    Go buy a Lotto ticket, major save
     
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  16. Huskymaniac

    Huskymaniac Formula Junior

    Jul 9, 2020
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    Tony
    When you heard this sound, did it change at all when the clutch was depressed? I have no idea why it would. Just asking because I have a high pitched noise that changes when the clutch is depressed.
     
  17. Ferrarium

    Ferrarium F1 Veteran
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    The fence on the main drive sprocket is the usual culprit of failed fences not the cam sprocket fences I have noticed.

    As far as dis-similar metal welding it's done all the time. Not to say the welder did it correctly or anything but different metals is not a huge issue. Are we sure they are different to begin with?
     
  18. Jasonberkeley

    Jasonberkeley Formula 3

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    No sir- did not change.
     
  19. Jasonberkeley

    Jasonberkeley Formula 3

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    All back together and running. Should be on chassis dyno Thursday. Took the opportunity to rebuild the shocks, cosmetically repair the 348 Challenge brake duct undertrays, replace the fuel lines, and refinish the two sets of white Speedline challenge wheels. Have been waiting for rebuilt shocks, which should hopefully arrive tomorrow.


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  20. 308 GTB

    308 GTB F1 World Champ
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    This Challenge car has found the best possible home.
     
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  21. Jasonberkeley

    Jasonberkeley Formula 3

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    Appreciate that sentiment, Barry!
     
  22. John Glen

    John Glen Formula Junior

    Dec 30, 2009
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    You are very fortunate to catch this in time ! Needless to say one must be very cautious when removing or especially installing this main drive pulley. I can imagine there are probably have been many instances where "novice" mechanics are often too quick to pick up a hammer and start swinging when installing back on the shaft. One inadvertent "blow" and striking the fence would be a major contributing factor................
     
  23. Jasonberkeley

    Jasonberkeley Formula 3

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  24. 308 GTB

    308 GTB F1 World Champ
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    Have fun tomorrow, Jason.

    Barry
     
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