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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1020 (Engine Mechanical - 6.6L (LLY)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Valve Rocker Arm and Shaft Cleaning and Inspection

Valve Rocker Arm and Shaft Cleaning and Inspection

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  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. Fig 1: Measure Rocker Arm Shaft Outside Diameter
    GM715777Courtesy of GENERAL MOTORS CORP.
  2. Replace the rocker arm shaft if the measured value is less than the service limit.
  3. Measure the rocker arm inside diameter. The production value is 22.01-22.035 mm (0.8665-0.8675 in).
    4. Fig 2: Measuring Rocker Arm Inside Diameter
    GM715778Courtesy of GENERAL MOTORS CORP.
  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. Measure the pushrods for warpage.
    7. Fig 3: Measure Pushrods For Warpage
    GM663588Courtesy of GENERAL MOTORS CORP.
  7. Replace the pushrod if the warpage exceeds 0.8 mm (0.031 in).
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