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Home >> Chrysler >> 2021 >> Voyager LX, Gas >> Repair and Diagnosis >> Engine Mechanical >> Lubrication System >> 3.6L Engine (Service Information) >> Cylinder Head >> Diagnosis And Testing >> Hydraulic Lash Adjuster

Hydraulic Lash Adjuster

A tappet-like noise may be produced from several items. Check the following items.

  1. Engine oil level too high or too low. This may cause aerated oil to enter the adjusters and cause them to be spongy.
  2. Insufficient running time after rebuilding the cylinder head. Low speed running up to 1 hour may be required.
  3. Turn the engine off and let set for a few minutes before restarting. Repeat this several times after the engine has reached normal operating temperature.
  4. Low oil pressure.
  5. The oil restrictor in cylinder head gasket or the oil passage to the cylinder head is plugged with debris.
  6. Air ingested into oil due to broken or cracked oil pump pick up.
  7. Worn valve guides.
  8. Rocker arm ears contacting valve spring retainer.
  9. Rocker arm loose, adjuster stuck or at maximum extension and still leaves lash in the system.
  10. Oil leak or excessive cam bore wear in cylinder head.
  11. Faulty lash adjuster.

The internal check balls on the exhaust hydraulic lash adjusters are reversed, for more information. Refer to LIFTER(S), HYDRAULIC, DESCRIPTION AND OPERATION .

NOTE:

The exhaust hydraulic lifter must never be interchanged with any other hydraulic lifter than what is specifically designated for this vehicle. The internal check ball is reversed and could cause engine damage if an incorrect part is installed.

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