Broken teeth on gear train

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Chadan, Sep 12, 2022.

  1. Chadan

    Chadan Bobtail Member

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    Sep 12, 2022
    Utah
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    First let me give a little back history. I bought a truck CAT C13 ACERT this last February 2022 that had a rebuilt motor in September of 2020 The truck was then parked from December of 2020 till February of 2022 (used maybe once a month for that whole year it was parked.) I bought it with less than 200 hours on the rebuilt motor. In April I had it in the shop to put a new air compressor on that had burned up and was told there was some metal shavings in the oil pan. I didn't think much of it because it was a rebuilt motor. In July, 3 teeth sheared off of one of the idler gears and ruined all of the other gears in the motor compartment. I recently got my truck back and it was out of the shop for 2 weeks before the exact same thing happened again. I've been racking my brain as to what could cause gears to fail twice in a matter of 500 hours worth of motor use when these motors should go for about a million miles. Any help would mean. Much appreciated
     
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  3. bjytech

    bjytech Light Load Member

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    Nov 9, 2013
    Ohio
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    Have to have a gear lash or centricity issue somewhere.
    I had one mess up some gears and it was all caused by someone replacing the air compressor and not bothering to install the back compressor the engine block bracket back on the new one, compressor came loose and ended up messing up the geartrain and front cover.
     
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  4. AModelCat

    AModelCat Road Train Member

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    How good did they clean out the metal from the earlier failures? Just takes 1 small chunk to get in between the gears and catastrophic failure.
     
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  5. Chadan

    Chadan Bobtail Member

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    Sep 12, 2022
    Utah
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    They drained all of the fluids. Remove the oil pan and every single one of the gears including the air compressor, water pump, oil pump. So there was nothing left in there to work around
     
  6. kranky1

    kranky1 Road Train Member

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    Did they put a reman head on it with no compensation for it in the lash by any chance?
     
  7. BoxCarKidd

    BoxCarKidd Road Train Member

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    We had a similar problem here. Appears the mechanic was trying to bump the starter inorder to get the compressor to spline up.
    Look for scaring on the face of the two gears. Fixed what was wrong and had no further problems.
     
  8. Chadan

    Chadan Bobtail Member

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    Sep 12, 2022
    Utah
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    The head was actually warrantied out in December of 2020. Would the head have something to do with backlash?
     
  9. kranky1

    kranky1 Road Train Member

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    If it’s a reman head that has been milled it will. If it had say .010 cut off it the teeth on the cam gear now sit .010 deeper into the idler.
     
    AModelCat Thanks this.
  10. spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    In block cam, no geartrain in cylinder head. Usually reason air compressor locks up is oil supply issue and C13 uses external hydraulic hose. Make sure it is supplying adequate oil flow and pressure.
     
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  11. kranky1

    kranky1 Road Train Member

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    I should have read that closer. Old eyes and assumption I went straight to 15L.
     
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