3971668 flywheel housing with alternative 4991576 is compatible with Cummins ISB6.7, ISD6.7, QSB6.7, ISBE and F4.5 engines. Heavy-duty cast housing accommodates flywheel assembly and serves as connection interface for gearbox installation. It absorbs transmission?system vibration and guards internal rotating components from external debris damage.
Supersedes:4991576
Condition:New / OEM Quality
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