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Chevrolet / Chevy Trailblazer Engine >> CRACKED FLYWHEEL HOUSING

    Automotive Domain Names

    Cracked Flywheel Housings On
    Cummins Diesel Engines

    A cracked flywheel housing can be caused by several conditions not all of which are directly related to the remanufacture of cylinder blocks or crankshafts. Some of those reasons are:

    Loose flywheel housing to cylinder block bolts.
    Missing dowel pins or worn dowel pin holes.
    Worn flywheel housing or cylinder block mating surfaces.
    Run-out between the crankshaft and the flywheel housing.
    Improper flywheel housing to transmission alignment.

    Worn or damaged driveline components may start orbiting which can result in high out-of-balance forces working on the flywheel housing. Usually this will cause the housing to start cracking from the bottom cap screw holes and work its way around the bolt pattern (see Illustration). Common causes are:

    Driveline imbalance
    Worn driveline components
    Too severe operating angles
    Improper phasing of U-Joints
    Loose transmission yoke
    Worn differential components

    The AERA Technical Committee
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