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2018 Ram 2500 6.4L Hemi Lifter Tick - MDS Problem?

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Mike T. · rep 0 · May 25, 2:27 AM · 1 replies · solved · Question

Vehicle: 2018 Ram 2500 Laramie 6.4L Hemi

I've got a persistent ticking noise coming from the engine of my 2018 Ram 2500 Laramie with the 6.4L Hemi. It's most noticeable on cold starts and sometimes at idle, especially after the truck warms up. The sound seems to be coming from the top of the engine.

I'm wondering if this is related to the MDS (Multi-Displacement System) or if it's a more serious lifter issue. The truck has about 70,000 miles on it, and I've been diligent with oil changes using recommended synthetic oil.

No check engine light yet, but it's concerning me. Has anyone else experienced this with their 6.4L Hemi, and what was the cause? Any diagnostic tips?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:27 AM

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ClearTheCode admin answer: The ticking noise you're hearing from your 2018 Ram 2500's 6.4L Hemi is a common concern among owners, often referred to as the 'Hemi Tick.' While it can sometimes be benign, it's frequently indicative of issues with the valvetrain, particularly the lifters and camshaft.

Here's a breakdown of potential causes and what to do:

  1. MDS Lifter Issues: The Multi-Displacement System (MDS) in Hemi engines uses special lifters that can deactivate cylinders for fuel efficiency. These lifters are a common failure point. When an MDS lifter fails, it can collapse or seize, leading to excessive play and a distinct ticking sound. This can also cause cam lobe wear.
  2. Non-MDS Lifter Failure: Even non-MDS lifters can fail due to wear, lack of lubrication, or manufacturing defects.
  3. Exhaust Manifold Leak: Before assuming lifters, it's crucial to rule out an exhaust manifold leak. Broken exhaust manifold bolts are extremely common on Hemi engines and can produce a ticking sound that is often mistaken for an internal engine issue, especially when cold. This sound usually dissipates as the engine warms up and the metal expands.
  4. Oil Quality and Pressure: While you're using recommended oil, ensure the correct viscosity is always used. Low oil pressure or sludge buildup can exacerbate lifter issues. A professional can check oil pressure at various RPMs.

What to Do:

  • Listen Carefully: Try to pinpoint the source of the tick. Is it louder on one side of the engine? Does it change with RPM? Does it go away when warm?
  • Inspect Exhaust Manifolds: Visually inspect the exhaust manifold bolts for any signs of breakage or rust streaks indicating a leak.
  • Professional Diagnosis: Since there's no check engine light yet, a full diagnostic scan might not show codes like P0300 (random misfire) initially. However, a skilled technician can use a stethoscope to isolate the noise and potentially use a borescope to inspect cam lobes if lifter failure is suspected. They can also perform an oil analysis.

When to See a Shop: If the ticking is persistent, loud, or accompanied by any performance issues (even minor ones), it's crucial to have it professionally diagnosed. Ignoring a failing lifter can lead to significant damage, including camshaft wear, cylinder head damage, and potentially catastrophic engine failure. Addressing an exhaust leak early is also important to prevent further damage and ensure proper engine operation.

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