CrankShaft Scissoring

Discussion in 'Touring Models' started by Joe2007ultra, Dec 29, 2008.

  1. Joe2007ultra

    Joe2007ultra Active Member

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    Anyone with 2007 and up have any experience with Crankshaft Scissoring? I Have read and herd that 2007 2008 engines are experiencing a problem due to too much tolerance in the press fit of the crank halves.

    Just curious if anyone has had the problem.
     
    Last edited by a moderator: Dec 29, 2008
  2. glider

    glider Veteran Member

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    I haven't personally but know of 2 that did.
     
  3. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

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    The short answer is yes. You will find lots of chatter on this site from folks that have had, or are having problems with their 96ci and larger engines. The problem usually manifests itself with increasing vibration later followed by oil pump problems and possibly catastrophic failure. See the self help section for more info.

    TQ
     
  4. Joe2007ultra

    Joe2007ultra Active Member

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    MOCO planning on doing anything about it ?

    Thanks
     
  5. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

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  6. glider

    glider Veteran Member

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    Me either but I have heard that the tolerances have been tightened up on the new engines because of this. Don't know if it is rumored or fact but they better do something before they eat too many crank repair/replacements.
     
  7. Joe2007ultra

    Joe2007ultra Active Member

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    I herd they are tighting them up also. Some shops are welding them after pressing. This can be a bad one if its a big batch of cranks.
     
  8. glider

    glider Veteran Member

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    The older cranks of past years were keyed or in some cases pinned and the new ones 07 on were just pressed together with none of the above so any sudden or hard acceleration or deceleration would cause them to scissor or cause excessive run out at the oil pump and take it out resulting in the engine damage.
    Myself, if I had a scissored crank, I would run it till the engine grenades so I would get an entirely new engine instead of a new crank only.
    Who's to say you weren't on the highway and doing 50-60 when the pump went out?
     
  9. Joe2007ultra

    Joe2007ultra Active Member

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    Sounds Like a plan. My warrantee is up in March 09. Might go red line it for an hour and wait till it goes!
     
  10. Bud White

    Bud White Well-Known Member Retired Moderators

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    Now are you saying the crank weights or fly wheels are turning on the crank journal just a tad bit and throwing it out of balance ..or just starting to spread?