"Hemi tick": lifter roller and camshaft lobe wear (2009+ Eagle engines (most reports 2011–2020))
Major repairThe best-documented failure is a hydraulic roller lifter whose needle bearings seize, so the roller skids on the camshaft lobe and wears it flat. Lubrication at low rpm, oil viscosity and parts quality have all been suggested as causes; whether the cylinder-deactivation (MDS) lifters are to blame is disputed, and FCA/Stellantis has not issued a recall or confirmed a defect. A class action (Petro v. FCA US LLC, D. Del.) alleges valvetrain defects in 2014–2022 5.7L and 6.4L trucks and SUVs; those claims are allegations, not findings.[6][7]
Symptoms
- Rhythmic ticking from the top of the engine that does not fade when warm
- Misfire codes on one cylinder, often with a rough idle
- Loss of power or a check-engine light under light load
Check before buying
- Listen at idle with the hood open after the engine is fully warm
- Scan for stored misfire codes and ask whether any cylinder has repeated misfires
- Ask for records of a camshaft and lifter replacement and what parts were used