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Chevrolet / Chevy Trailblazer Engine >> CRACKED FLYWHEEL HOUSING


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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