Got 308 back from major, BUT... | FerrariChat
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Got 308 back from major, BUT...

Discussion in '308/328' started by milby1, May 11, 2009.

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  1. milby1

    milby1 Karting

    May 26, 2008
    191
    USA
    #1 milby1, May 11, 2009
    after driving for a bit noticed a grating sound at about 4000 rpm, particularly obvious in 1st and 3rd gears. Sounds like the shhhh shhhh of rotating metal on metal, and arises then dissapears as you move through 4000 rpm.

    Mechanic has had the car back now for 2 weeks and is having touble IDing the issue so I'm submitting the available info to this august group in hopes of some leads.

    He says it appears for him in neutral, 1st, 2nd and 3rd gears, at the noted 4000 rpms only. Occurs with the gate removed. He thinks the appearance of the sound at the shifter is harmonic, but he's not sure. Motor mounts are OK. He changed the gear oil out but this had no effect.

    I've seen some similar symptoms on a search but nothing quite described as what I experienced. Any ideas?
     
  2. SonomaRik

    SonomaRik F1 Veteran

    Dec 15, 2006
    6,904
    Folsom, CA (formerly Sonoma)
    #2 SonomaRik, May 11, 2009
    did your mech do an engine out Major, or in SITU?
    rik
     
  3. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,146
    Cowboy Capitol of the World
    Full Name:
    Brian Crall
    #3 Rifledriver, May 11, 2009
    Around 4000 the 308 motor vibrates a bit and all kinds of things can make noise. The A/C hoses going over the fuel tank is a common one after a major but it is clear it comes from the R/R corner of the cabin. You might have a look at the big coolant pipe and be sure it isn't rubbing the alt pulley. Also be sure all the timing belt cover bolts are in place and tight. Those make a terrible noise.
     
  4. Jedi

    Jedi Moderator
    Moderator Lifetime Rossa Owner

    Mar 18, 2008
    32,284
    Seattle Area
    Full Name:
    Dave
    #4 Jedi, May 11, 2009
    +1 - I had much the same problem before my major last year and in fact it was not only a loose
    timing belt cover bolt, but several other fasteners that were loose that once tightened solved the
    noise-at-4000 problem in my 328. Just spend an hour looking for looseness and that might be all
    it is. Worked for me.

    Jedi
     
  5. milby1

    milby1 Karting

    May 26, 2008
    191
    USA
    #5 milby1, May 11, 2009
    engine out.

    Thanks Rifle and Jedi: will check these things out. BTW, '82 gtsi
     
  6. milby1

    milby1 Karting

    May 26, 2008
    191
    USA
    #6 milby1, Jul 25, 2009
    To follow up on this, turned out to be loose bolts on the ac belt cover in the right front engine bay
     
  7. 308GTS

    308GTS Formula 3

    Dec 27, 2001
    2,223
    TN
    #7 308GTS, Jul 25, 2009
    Another one that isn't as common but I have seen it twice is the same pipe that goes to the t-stat housing. Sometimes it can rub on the alternator. Sometimes when the lower hose is replaced it is too short or the pipe is pushed in to far and I have seen the pipe hit the alternator. Worth checking.
     
  8. 308-newbie

    308-newbie Guest

    #8 308-newbie, Jul 26, 2009
    I had the exact same issue. Mine turned out to be a broken bolt, but it made a horrendous noise at ~4000RPM, and only over about 500-800 PMD range. I thought something was coming apart!
     
  9. doug328

    doug328 Formula 3

    Mar 11, 2004
    1,599
    The Space Coast, FL
    Full Name:
    Doug B
    #9 doug328, Jul 27, 2009
    It's also common for that pipe to rub up against the fuel tank, wearing down the pipe and eventually putting a hole in the pipe. Had to have the worn spot on my pipe built back up with some welding beads. I now have a section of old rubber hose clamped over the area to prevent any chafing/wearing.
     

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