How To Get Rid Of Hemi Tick: The Definitive Repair And Prevention Guide

Eliminating the "Hemi Tick" requires a systematic diagnosis to distinguish between external exhaust manifold leaks and internal valvetrain failure, typically involving the replacement of sheared Grade 8 manifold bolts or the installation of upgraded non-MDS lifters and high-output oil pumps. Success is measured by the restoration of hydraulic lash adjuster pressure and the elimination of rhythmic tapping at 400-800 RPM, often necessitating a transition to high-shear-stability lubricants with elevated molybdenum content.

Diagnostic Protocol and Mechanical Equipment Requirements

Before attempting to get rid of the Hemi tick, you must determine if the sound originates from a manifold leak (common on the 5.7L Eagle heads) or a catastrophic lifter needle bearing failure. A manifold leak often disappears as the engine reaches operating temperature and the metal expands, whereas a valvetrain tick—caused by a flattened cam lobe or a collapsed lifter—is persistent and usually coincides with a P0300 series misfire code.

The scope of this repair ranges from a basic bolt extraction (3-5 hours) to a full top-end teardown (15-20 hours). You should budget between $200 for a manifold fix and $3,500 for a full camshaft and lifter replacement if performed at a professional facility.

Essential Gear and Materials Checklist:

• Specialized Extraction Tools: Left-hand drill bits, a high-quality bolt extractor kit (specifically for 8mm fasteners), and a 90-degree drill attachment for tight clearances against the frame rail.
• Precision Measurement Tools: A mechanical oil pressure gauge to verify PSI at hot idle and a calibrated torque wrench capable of measuring in inch-pounds and foot-pounds.
• Replacement Components: Multi-layer steel (MLS) exhaust gaskets, Grade 10.9 or ARP manifold studs, Mopar or Redline lifters, and a new head gasket set if internal work is required.
• Chemicals and Lubricants: High-zinc break-in oil (if replacing the cam), Mopar 5W-20 or 5W-30 synthetic oil, and penetrating oil (AeroKroil or PB Blaster) for heat-cycled fasteners.
• Diagnostic Equipment: An automotive stethoscope or a length of vacuum hose to isolate the sound to a specific cylinder or manifold port.

Professional Execution Steps for Internal and External Hemi Tick Remediation

Step 1: Acoustic Mapping and Source Identification

The first step in getting rid of the Hemi tick is locating the source. Use an automotive stethoscope to probe the exhaust manifold heat shields. A sharp, rhythmic "snap" suggests an exhaust leak, usually at the rear cylinders (7 and 8) where heat buildup is highest. If the sound is a dull, heavy "thud" or "clatter" coming from the center of the valve cover, the lifter or camshaft has likely failed.

1. Start the engine from a cold soak and listen for the noise duration.
2. If the noise vanishes within 2 to 5 minutes, proceed to Step 2 for manifold repair.
3. If the noise persists and increases in frequency with RPM, or if you have a "Misfire at Idle" code, proceed to Step 3 for valvetrain intervention.

Pro-Tip: Check the oil filter for metallic debris. Fine, "glitter-like" shavings indicate a cam lobe is being ground down by a seized lifter roller, confirming an internal failure.

Step 2: Remediating Exhaust Manifold Bolt Failure

The 5.7L Hemi is notorious for snapping exhaust manifold bolts due to the different expansion rates of the cast iron manifold and the aluminum cylinder head. To get rid of this version of the tick, you must replace the hardware with higher-grade components.

1. Remove the inner fender liners to gain access to the exhaust manifolds.
2. Unbolt the heat shields and identify snapped bolts; they are almost always the rear-most fasteners.
3. Apply heat via an induction heater or oxy-acetylene torch to the remaining bolt stubs.
4. Use a center punch to mark the exact middle of the broken stud.
5. Carefully drill and extract the stud. If the threads are damaged, use a Time-Sert or Heli-Coil to restore the M8x1.25 threads.
6. Install new MLS gaskets. Avoid cheap paper gaskets as they cannot withstand the thermal cycles of the Hemi engine.
7. Replace all bolts with ARP stainless steel studs, which allow the manifold to expand and contract without shearing the fastener.

Step 3: Top-End Disassembly for Lifter Access

If the tick is internal, you must remove the cylinder heads to reach the lifter buckets located in the engine block.

1. Drain the cooling system and remove the intake manifold.
2. Remove the valve covers and the rocker arm assemblies. Inspect the pushrods for straightness and the rocker tips for excessive wear.
3. Unbolt the cylinder heads. Note that Hemi head bolts are Torque-to-Yield (TTY) and cannot be reused.
4. Pull the lifter "trees" (the plastic retainers holding the lifters).
5. Inspect the rollers on the bottom of each lifter. Any pitting, flat spots, or seized rollers mean the camshaft is also compromised and must be replaced.

Warning: Never install new lifters on a used camshaft if a lifter has failed. The microscopic wear patterns on the cam lobes will immediately destroy the new lifters, causing the tick to return within 500 miles.

Step 4: Camshaft and High-Volume Oil Pump Installation

To permanently get rid of the Hemi tick caused by oil starvation, many owners opt for a non-MDS (Multi-Displacement System) conversion. MDS lifters are more prone to failure because they have more moving parts and smaller oiling orifices.

1. Remove the timing cover and the timing chain set.
2. Slide out the old camshaft and install a new OEM or performance grind.
3. If deleting MDS, install "non-MDS" lifter blocks and plug the MDS oil towers in the block.
4. Upgrade to a Hellcat or Mopar High-Volume oil pump. This increases oil flow to the top end during hot idle, which is the primary window where lifter damage occurs.
5. Reassemble the engine using new gaskets and TTY bolts, following the specific sequence and torque angles required for the 5.7L or 6.4L platform.

Step 5: Post-Repair Calibration and Lubrication Strategy

Once the mechanical work is complete, you must address the root cause: lubrication and heat management.

1. Refill with a high-quality synthetic oil. Many specialists recommend a 5W-30 weight over the factory-spec 5W-20 to provide better film strength at high temperatures.
2. Add a lubricant with a high concentration of molybdenum (Moly). Moly coats the needle bearings in the lifters, providing protection during cold starts when oil pressure is low.
3. Update the PCM (Powertrain Control Module) if you performed an MDS delete to prevent "Check Engine" lights and ensure proper fuel mapping.

Technical Specifications and Torque Benchmarks

To ensure a permanent fix, all fasteners must be tightened to the exact SAE/Metric specifications. Over-tightening manifold bolts is a leading cause of future snapping, while under-tightening head bolts leads to gasket failure.

Common Failure Scenarios and Field Fixes

Even with a meticulous repair, certain environmental and mechanical factors can interfere with your goal to get rid of the Hemi tick. Below are the most common field failures encountered by Mopar technicians.

• Scenario: Snapped Bolt Remains Stuck After Drilling

  
  
  
  • Root Cause: Electrolysis between the steel bolt and aluminum head has "welded" the threads together, or the drill bit drifted off-center.
  • Actionable Fix: Use a TIG welder to weld a nut onto the protruding stud. The localized heat from the weld often breaks the oxide bond, allowing the stud to be backed out with a standard wrench.

• Scenario: Tick Returns Only When Engine is Hot

  
  
  
  • Root Cause: Low oil pressure at operating temperature caused by a worn oil pump or excessive bearing clearances.
  • Actionable Fix: Switch to a higher viscosity oil (e.g., 0W-40 or 5W-40) and install a mechanical pressure gauge to ensure you have at least 15-20 PSI at a hot idle of 650 RPM.

• Scenario: Persistent Misfire Code After Cam Swap

  
  
  
  • Root Cause: The Phasing of the Variable Valve Timing (VVT) actuator was not reset, or the MDS solenoids are still being commanded by the ECU.
  • Actionable Fix: Perform a "Cam/Crank Relearn" procedure using a bidirectional scan tool. If MDS was deleted, ensure the tuner has correctly disabled the four MDS solenoid sub-routines in the software.

• Scenario: New Exhaust Gasket Fails Within Months

  
  
  
  • Root Cause: The manifold mating surface is warped. Cast iron manifolds often "curl" after years of heat cycles.
  • Actionable Fix: Before reinstallation, take the manifolds to a machine shop to be surfaced (milled flat), or replace them with shorty headers that have thicker 3/8-inch flanges.

Frequently Asked Questions

Will the Hemi tick cause my engine to fail?

If the tick is caused by an exhaust leak, it is a nuisance that slightly reduces fuel economy and increases emissions. However, if the tick is internal (lifter failure), it will eventually grind the cam lobe flat, sending metal shards through the engine and leading to total bearing failure and engine seizure.

Does using a specific oil brand get rid of the Hemi tick?

While oil brand alone won't fix a broken part, oils with high Molybdenum content (like Redline 5W-30) have been proven in field tests to silence "dry" lifters. Moly provides a sacrificial barrier on the needle bearings, which is critical because the Hemi’s oiling design relies on "splash" lubrication for the cam/lifter interface.

How much does it cost to fix the Hemi tick at a dealership?

Dealerships typically charge between $800 and $1,200 for manifold bolt repairs per side. For a full lifter and camshaft replacement, costs range from $3,500 to $4,500, as they usually follow the standard book time and replace the entire top end with OEM parts.

Can I drive my truck with the Hemi tick?

You can drive with an exhaust-related tick indefinitely, though it may eventually damage the oxygen sensors. You should not drive with a valvetrain tick for more than a few hundred miles, as the mechanical damage to the camshaft will accelerate rapidly, leading to a loss of power and potential engine failure.

Why is the 5.7L Hemi more prone to ticking than other V8s?

The primary reasons are the steep 45-degree angle of the lifter bores, which makes it harder for oil to reach the rollers at low RPMs, and the Multi-Displacement System (MDS), which restricts oil flow to specific lifters to facilitate cylinder deactivation.

Professional Engine Restoration and Support

If you have completed the diagnostic steps and identified a valvetrain failure, ensure you source high-quality replacement parts to prevent a recurrence. Proper maintenance, including shorter oil change intervals and high-flow filtration, is the only way to safeguard your Hemi engine from future mechanical noise.