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6.2 broken Crankshaft

Discussion in '1982-Present GM Diesel' started by BigCUCV, Jul 16, 2003.

  1. BigCUCV

    BigCUCV Registered Member

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    Hi there,
    I've heard from so many 6.2s with a broken Crankshaft that I start wondering what causes the crank to break,
    is worn out Main bearings or is the crank warped or can you put too much load on the crank like towing heavy trailers all the time or rev the motor too high or does it happen if run it with WOT most of the time or is the 6.2 crank simply too weak????
    How can I prevent my motor from ending up with a broken crank???????
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    From what I've read here the root cause is usually a bad harmonic balancer...then the crank breaks./forums/images/graemlins/eek.gif

    Rene
     
  3. edeslaur1

    edeslaur1 1/2 ton status

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    That's what thedieselpage.com says.

    Bad rubber ring, or broken Vib dampener.
     
  4. cegusman

    cegusman 3/4 ton status

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    How can you tell when the balancer is going out or is bad?
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    From what i understand the rubber part starts to squish out from between the inner and outer rings. I seem to recall mine was doing this but I didn't give it much thought at the time. I will probably replace it just to be safe.

    I'd hate to have the crank break on the way to Moab...or worse yet on the trail in Moab/forums/images/graemlins/eek.gif

    Rene
     
  6. edeslaur1

    edeslaur1 1/2 ton status

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    They also crack.

    Oil all over your vibration dampener is a bad thing since it eats the, arguably, non-oil resistant rubber.


    A vibration dampener is essentially two pieces of metal bonded together by this rubber. Like engine mounts, over time, the rubber wears.

    Diesels have severe vibrations compared to gas engines. They're not as "smooth", so the vibration dampeners wear out faster.

    They're not too expensive, so well worth the investment.
     

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