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The rocker arm has insufficient movement and the valve lash exceeds the specification.

Probable Cause

• Lubrication of internal engine components is inadequate.
  Check lubrication of the valves. There must be a strong flow of oil at high rpm. There must be a small flow of oil at low rpm. Oil passages in the engine must be clean.
• Rocker arm parts are worn.
  If there is too much wear, install new parts or rocker arms. Adjust the valve lash.
• The end of the valve stem is worn.
  Install new valves. Adjust the valve lash.
• The valve lash exceeds the specification.
  Measure the valve lash. Adjust the valve lash.
• The pushrods are worn.
  If there is too much wear, install new pushrods. Adjust the valve lash.
• The valve lifters are worn.
  If there is too much wear, install new valve lifters. Adjust the valve lash.
• The lobes of the camshaft are worn.
  Measure the valve lash. Check for free movement of the valves. Check for bent valve stems. Check for wear on the valve lifters. Replace suspect parts. Adjust the valve lash.
• The bolts and the nuts that hold the rocker arm assembly are loose.
  Tighten the bolts and the nuts.