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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 67 (Engine Mechanical - 6.6L (On-Vehicle)) >> Removal & Installation >> Valve Rocker Arm, Shaft & PUSHROD >> Inspection

Valve Rocker Arm, Shaft & PUSHROD: Inspection

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using a micrometer, measure rocker arm shaft outside diameter at locations of rocker arm. The production value is 0.8653-0.8661" (21.979-22 mm) and service limit is 0.8602" (21.85 mm). Replace rocker arm shaft if measurement value is less than service limit. Measure rocker arm inside diameter. The production value is 0.8665-0.8675" (22.01-22.035 mm).
  2. Replace rocker arm if measurement exceeds service limit. Inspect valve clearance adjusting screw for damage. Replace valve clearance adjusting screw if damage is found. Inspect valve bridge and valve bridge pin for damage. Replace valve bridge or valve bridge pin if damage is found.
  3. Measure pushrod for warpage. Replace pushrod if warpage exceeds 0.031" (0.8 mm).
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