LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 457 (Engine Mechanical - 6.6L V8 Diesel) >> Overhaul >> Valve Train >> Rocker Arm & Shaft Assembly

Rocker Arm & Shaft Assembly

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.
  1. To disassemble rocker arm assembly, insert screwdriver into rocker arm shaft bore. Break off end of retainer. Pull out retainer with pliers. Mark rocker arms for reassembly to original location on shaft. Remove rocker arms from shaft.
  2. Inspect rocker arms and rocker arm shaft at mating surface for damage. Measure rocker arm shaft outside diameter where rocker arm is located. The production value is 0.8653-0.8661" (21.979-22.0 mm) and service limit is 0.8602" (21.85 mm). Replace rocker arm shaft if measured value is less than service limit.
  3. Measure rocker arm inside diameter. The production value is 0.8665-0.8675" (22.01-22.035 mm). Calculate rocker arm shaft to rocker arm clearance. Subtract rocker arm shaft outside diameter from rocker arm inside diameter. Replace rocker arm if rocker arm shaft to rocker arm clearance is over 0.0079" (0.2 mm). Inspect valve lash adjusting screw and lock nut for damage. Replace valve lash adjusting screw if any damage is found.
  4. Inspect push rods for bend and wear. Measure push rods for warpage. Replace push rod if warpage exceeds 0.031" (0.8 mm). Ensure oil passages are clear. To assemble rocker arm assembly, coat rocker arms with engine oil and install on shaft in original locations. Center rocker arms with their corresponding holes on shaft. Install NEW nylon retainers with a 1/2" minimum diameter drift punch.
scientia non olet · About LEMON Manuals