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FlyWheel 6.2&6.5

Discussion in '6.2 and 6.5 Technical Reference Library' started by valyidol, Feb 11, 2018.

  1. valyidol

    valyidol Member

    252
    22
    Dec 17, 2013
    Russia, Moscow
    Hello! Sorry for my English. The Google helps me a little. Today I argued with my friend. He said that the flywheel 6.2 and 6.5 are different (trans TH400&4L80). He said that the balancers of the crankshafts with two-pieces oil seal and one-piece oil seal are different and therefore the weights on the flywheels are location differently. To compensate for vibrations. I said that the flywheels are the same and they are balanced separately from the crankshaft to the "0". And the weights of all flywheel are location differently. And the HB damper balances the crankshaft. Ho of us is right?
    Thanks. Don't throw rotten tomatoes at me, pls.
     
  2. WarWagon

    WarWagon Well it hits on 7 of 8...

    7,996
    2,241
    Nov 15, 2009
    AZ
    Flywheel used here means flexplate. Manual transmissions have ~50 LB flywheels. Automatic trans have lightweight flexplates that flex with Torque Converter ballooning.

    The Flywheel does have weights on it: They are all the same. 6.2, 6.5 same flywheel for automatics. They have nothing to do with the rear main oil seal. I have a 1993 one piece oil seal 6.5 flywheel on my 1985 rope seal 6.2. No difference.

    The Harmonic Damper on the front of the engine is a damper only. The Damper does not have anything to do with balance.

    The Vbelt damper for AC or serpentine belt damper on the front of the crankshaft doesn't have any balance weights.
     
  3. valyidol

    valyidol Member

    252
    22
    Dec 17, 2013
    Russia, Moscow
  4. valyidol

    valyidol Member

    252
    22
    Dec 17, 2013
    Russia, Moscow
    image.jpeg I meant this Harmonic balancer:
     
  5. Will L.

    Will L. Well-Known Member

    7,024
    5,191
    Jan 25, 2013
    Boulder City Nv
    Same one for both 6.2 and 6.5

    WARNING- DANGER!!!
    This part failing is #1 reason for broken crankshaft and block cracks!

    Cheaper brands do not last long- most only 50,000 kilometers.
    AC Delco is best low price option and good for 160,000 kilometer on safe side.

    Very best choice is Fluidamper and good for over 800,000 kilometers. http://leroydiesel.com/products/fluid-damper-for-ds4-or-db2/

    Whenever you replace the balancer, you replace the belt drive pulley also. Best option for that is this: http://leroydiesel.com/products/billet-crankshaft-pulley/
    If you cannot buy from Leroy, find a source for fluid damper or buy both parts in AC Delco.
     
    WarWagon likes this.
  6. valyidol

    valyidol Member

    252
    22
    Dec 17, 2013
    Russia, Moscow
    Thank you Will. I know that. I use AC Delco. My question not about it.I ask what function have balancer?
     
  7. Will L.

    Will L. Well-Known Member

    7,024
    5,191
    Jan 25, 2013
    Boulder City Nv
    It reduces the harmonic and torsional vibrations of the crankshaft.

    For some engines, not all, It is a counterbalance for the crankshaft. The difference is what is known as an internally balanced or an externally balanced System.
     
  8. valyidol

    valyidol Member

    252
    22
    Dec 17, 2013
    Russia, Moscow
    Thank you Will!
    I won this bet!
     
    smokymtn65 and Jaryd like this.
  9. ak diesel driver

    ak diesel driver 6.5 driver

    12,475
    2,267
    Feb 7, 2009
    alaska
    The Harmonic Damper on the front of the engine is a damper only. The Damper does not have anything to do with balance.


    I think you'll find the harmonic balancer is part of the engine balance. It has a built in weight on one side so it's a dual purpose item
     
    WarWagon likes this.
  10. cornemuse

    cornemuse Active Member

    115
    50
    Jan 11, 2013
    San Diego north county
    Plus that little groove (at 4:00 o clock, in post #4) for measuring rpms (& top dead center)
     

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