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Old 11-06-2012, 03:26 PM
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2009-2013 Hemi engines: Clatter / Tick Noise

Symptom/Vehicle Issue: Clatter / Tick Noise From Engine

November 2012

Diagnosis:

If the customer complaint is loud clatter / ticking type noise after engine has not been started for several days, or noise is detected during PDI, there is a possibility that air has been trapped in the Hydraulic Lash Adjuster. Please follow these guidelines when evaluating engine noise related to lifters (HLAs) in Hemi engines.

Hemi Lifter Purge Guideline

1. Warm engine to standard idle conditions.
2. Listen to the engine for 30 to 60 seconds with the hood up and the engine cover removed.

Note: Engine noise may be in the form of a clicking, chatter, or clattering noise. If noise is present, de-aeration of the lifters maybe required.

3. Run the engine between 2000 and 3000 RPM for three to five minutes.
4. Return the engine to standard idle speed for 30 to 60 seconds.
5. Evaluate noise if noise is present repeat the run an additional 4 cycles.
6. If noise is present, take the vehicle on a typical drive cycle.

Note: The typical drive cycle will be about 10-15 miles of combined highway and city driving.

Note: Avoid marshaling maneuvers (quick start /stop operation) during evaluation.

7. Evaluate the noise. if noise present, follow standard service procedure for lifter repairs or noise conditions.
8. Evaluate lifters for sponginess, check valve defects, and clearance.

Note: Use a feeler gauge to verify clearance is present between the lifter and cam base circle

--Milous
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