6.4L HEMI V8
6.4L HEMI lifter & camshaft repair
Lifter and cam wear on the 6.4L HEMI.
Why this matters on the 6.4L HEMI V8
The 6.4L shares HEMI valvetrain design with the 5.7L, including lifter and cam lobe wear concerns.
Symptoms owners notice
- Tick
- Misfire
What we check
- Valvetrain inspection
Related causes we rule out
- Roller lifter needle-bearing failure, which lets the roller stop turning and wear the cam lobe
- MDS deactivation lifters on cylinders 1, 4, 6 and 7
- Extended idling, long oil-change intervals or the wrong oil viscosity for the engine
Repair work involved
- Lifter and camshaft replacement
Repair considerations
- Once a lobe is damaged, the camshaft is replaced along with the lifters — new lifters on a worn lobe fail again
- Metal debris means the oil pump, oil cooler (if equipped) and bearings need to be evaluated
- Whether to keep MDS in factory configuration is discussed before parts are ordered; we repair to the factory design