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Help! Truck sounds like a helocopter!!

Discussion in 'Trucks and Trailers' started by 81Bronk36, May 22, 2009.

  1. 81Bronk36

    81Bronk36 LawnSite Member
    Messages: 178

    I need to fix this thing fast, I am leaving on vacation for a month and the guy taking my lawns needs to use my truck while I am gone!

    All started last night when I started it up and it was vibrating real bad after startup (the engine was probably pitching 2" or so!) Then it started sounding like a really bad exhaust leak or something is rubbing everytime it goes around. (but not metal..???) Even when cranking it make the noise really loud like a fan blades catching a lot of air. I do notice that it still starts up the same so i really dont think its something wrong with the engine like was my first thought (broken valve spring or a cylinder not firing or something) My next step is to remove the cover between the engine and tranny and see if something wrong with the fly wheel or something. I have checked everything over visibly from the outside so I am NOT just asking before I pop the hood... Anyone have any idea, its my first diesel and my first Auto tranny.

    Last night it seamed to drive ok too maybe a little low on power though.
  2. MarcSmith

    MarcSmith LawnSite Fanatic
    Messages: 7,157

    no help on the truck, but taking a vacation this early in the growing season...must be nice...:)

    have you tried taking the fan off of the truck(if its engine driven) and see if that helps. an out of balance fan can make the engine act/sound funny, but there should not be a loss of power...

    Problem with the Turbo??? maybe an air leak between the turbo and intake manifold...???just tossing stuff out there...
  3. 81Bronk36

    81Bronk36 LawnSite Member
    Messages: 178

    Its an N/A diesel, A fan can actually cause that much noise and vibration??
  4. 81Bronk36

    81Bronk36 LawnSite Member
    Messages: 178

    I will try taking off the belts and see, it even does it while It is cranking so I will know immediatly.
  5. 81Bronk36

    81Bronk36 LawnSite Member
    Messages: 178

    That didnt fix it.
  6. MarcSmith

    MarcSmith LawnSite Fanatic
    Messages: 7,157

    put a 1/2 of one blade on on your mower and engage the blades :)...a severely out of balance fan can create the illusion of much larger problems..
  7. 81Bronk36

    81Bronk36 LawnSite Member
    Messages: 178

    I called 2 diesel mechanics, one said he never heard of a truck sounding like that, the second said 6.9's are notorious for throwing rocker arms or having the studs pop out of the head. I removed the drivers side valve cover and nothing is wrong so I am working on the pass side. Gonna take a while. Hope it didnt jack up the head... it would literally total the truck.
  8. jkilov

    jkilov LawnSite Bronze Member
    from MS
    Messages: 1,415

    What you're hearing may be roll-over noise from the tranny due to the vibrating engine.

    Why exactly it vibrates I'm not sure. Miss fire due to leaky injectors or some sort of imbalance, i.e. faulty dual mass flywheel (if equipped) or problems with the transmission itself.

    Just start it up again, watch and increase the revs slowly. See if the vibration has a rev sweet spot or just indifferent.
  9. lawnboy dan

    lawnboy dan LawnSite Gold Member
    Messages: 3,711

    your first mistake is taking a vacation this time of year.second is not having a backup truck
  10. 81Bronk36

    81Bronk36 LawnSite Member
    Messages: 178

    Your right, but I am just a part timer and I got them covered while I am gone. I dont have anything back up... can't really afford it.

    I got the truck towed to a mechanic tonight. Should find out tommorrow or Monday. This sucks.

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