The ticking noise from your 2017 Ram 1500's 5.7L Hemi engine has become a common concern among truck owners. While some tick is characteristic of Hemi engines, distinguishing normal operation from concerning problems helps determine necessary action.
Sources of Hemi Tick
The tick can originate from multiple sources: hydraulic lifter bleed-down during extended parking, MDS lifter issues, exhaust manifold bolt failures, rocker arm wear, or injector noise. Each produces slightly different characteristics.
MDS Lifter Problems
The Multi-Displacement System uses specialized lifters on four cylinders that can collapse or malfunction. When MDS lifters fail, they create ticking that may be present continuously or during cylinder deactivation events. This is a common source of Hemi tick complaints.
Exhaust Manifold Tick
The Hemi's exhaust manifold bolts are known for breaking due to thermal cycling. Broken bolts create exhaust leaks that tick at startup but may quiet as metal expansion temporarily seals the gap.
Normal Hydraulic Lifter Behavior
Brief ticking on cold startup that disappears within 30-60 seconds as oil pressure reaches all lifters is relatively normal. This represents lifter bleed-down during extended parking and isn't necessarily concerning.