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Home >> Hyundai >> 1990 >> Excel GL, 4D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Valve Clearance >> Checking Hydraulic Lash Adjusters

Checking Hydraulic Lash Adjusters

  1. Remove valve cover. Press where rocker arm contacts lash adjuster at the very top. If adjuster is normal, it will feel very hard.
  2. If hydraulic lash adjuster moves easily downward, it is faulty and must be replaced.
  3. If hydraulic lash adjuster feels soft or spongy, air has probably entered hydraulic lash adjuster. If this occurs, check engine oil level. If engine oil level is okay, check oil screen and oil screen gasket for damage.
  4. After repairing cause of air leak, warm engine to operating temperature. If there is abnormal noise at idle, bleed the hydraulic adjusters.
  5. To bleed hydraulic adjusters, slowly increase engine speed to 3000 RPM and back to idle over approximately 60 seconds. Repeat this several times. This will help remove air from hydraulic lash adjusters. If there is still abnormal noise, replace noisy hydraulic lash adjusters.
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