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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 6.6L (4 Of 5) >> Off-Vehicle Repair Instructions (2 Of 3) >> Valve Rocker Arm and Shaft Cleaning and Inspection

Valve Rocker Arm and Shaft Cleaning and Inspection

    Fig 1: Measuring Rocker Arm Shaft Outside Diameter
    GM715777Courtesy of GENERAL MOTORS CORP.
  1. Measure the rocker arm shaft outside diameter where the rocker arm is located. The production value is 21.979-22.0 mm (0.8653-0.8661 in) and the service limit is 21.85 mm (0.8602 in).
  2. Replace the rocker arm shaft if the measured value is less than the service limit.
    3. Fig 2: Measuring Rocker Arm Shaft Inside Diameter
    GM715778Courtesy of GENERAL MOTORS CORP.
  3. Measure the rocker arm inside diameter. The production value is 22.01-22.035 mm (0.8665-0.8675 in).
  4. Calculate the rocker arm shaft to rocker arm clearance.
    1. Subtract the rocker arm shaft outside diameter from the rocker arm inside diameter.
    2. Replace the rocker arm if the rocker arm shaft to rocker arm clearance is over 0.2 mm (0.0079 in).
  5. Inspect the valve lash adjusting screw and lock nut for damage. Replace the valve lash adjusting screw if any damage is found.
    6. Fig 3: Measuring Pushrod For Warpage
    GM663588Courtesy of GENERAL MOTORS CORP.
  6. Measure the pushrods for warpage.
  7. Replace the pushrod if the warpage exceeds 0.8 mm (0.031 in).
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