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Failure mode - Cummins 6.7L ISB (Ram HD)

Exhaust manifold cracking

Reliability tier: verified - verify before ordering, see /disclosure/

Symptoms

Root cause

Thermal cycling cracks the high-mileage manifold, especially on trucks that tow hard. Leaks waste driveability and can cook nearby components. Straight-pipe / deleted trucks cycle colder-hotter and crack sooner.

Diagnosis

Fixes

replace with a new/reinforced manifold and gaskets (upgrade designs exist) ()

Prevalence

common

Affected configurations (58)