Valve Rocker Arm, Shaft & Push Rod: Inspection
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- 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).
- 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.
- Measure push rod for warpage. Replace push rod if warpage exceeds 0.031" (0.8 mm).