Turbo chirping

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by TruckinTreeGuy, Jul 7, 2020.

  1. TruckinTreeGuy

    TruckinTreeGuy Bobtail Member

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    I have a 99 Cummins N14 Celect Plus. I’m not sure what it came out of but it’s in an 01 Freightliner Century now. I recently had the exhaust manifold gasket that goes into the back side of the turbo replaced. It made the truck run quieter but now I can hear a chirping sound that sounds like it’s coming from the passenger side of the motor. It’s almost like a belt chirping but I only hear it when I’m in the high side of the gears and about half throttle or more. I’m a new OO and this is my first truck just looking for a little advice if anyone can help thank you.
     
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  3. Trucking in Tennessee

    Trucking in Tennessee Road Train Member

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    I am not a certified mechanic, but my experience with engines is that when you hear chirping, it's usually friction of some kind, usually metal on metal. You may need a turbo build.
     
    Rideandrepair Thanks this.
  4. TruckinTreeGuy

    TruckinTreeGuy Bobtail Member

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    I appreciate it that’s what I was thinking but hoping I was wrong.
     
  5. kwswan

    kwswan Road Train Member

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    Check your air to air clamps & boots first before you go to putting a turbo on.
     
    Rideandrepair and tommymonza Thank this.
  6. AModelCat

    AModelCat Road Train Member

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    Exhaust leak. My 3406A made chirping noises because the first 2 cylinders had no studs in them.
     
    lwlevens, Rideandrepair and 650cat425 Thank this.
  7. Judge

    Judge Road Train Member

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    Wait...Wait...Waitttt.

    If you’re hearing chirping/squeeking under acceleration/boost it could be a head bolt.

    After a while, when one breaks, the head gasket will errode.
    Old Cummins were known for this.

    N-14 Celect, I’m assuming it’s a 460
     
  8. blairandgretchen

    blairandgretchen Road Train Member

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    Good news, it’s 3 separate heads, not one.
     
  9. bigguns

    bigguns Road Train Member

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    In the late 80’s most trucks were cabovers. If you heard a bird chirping in the bunk you most likely had a broken head bolt as this was fairly common back then. Yes it really did sound like a bird in the bunk.
     
  10. BoxCarKidd

    BoxCarKidd Road Train Member

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    I had an extra long drill bit and extractor. If caught early enough the bolt could be replaced with the head on and the gasket would be OK.
     
  11. jamespmack

    jamespmack Road Train Member

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    X2
     
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