HEAD 1916191 - Caterpillar

Remove Rocker Shaft Assemblies & Push Rods
Start By:a. remove valve covers 1. Remove bolts (1) that hold the valve cover bases to the cylinder head assembly. Remove valve cover bases (2). 2. Use Tool (A) to loosen fuel injection line (3) from fuel injection nozzle (4). 3. Use Tool (B) to loosen the nut at the fuel injection line adapter end. Remove inner fuel injection lines (3). Install caps and plugs on all fuel injection line openings to keep dirt out of the fuel system. 4. Remove bolts (5) that hold the rocker shaft assemblies to the cylinder head assembly.5. Remove rocker shaft assemblies (6). 6. Put identification marks on the push rods as to their location in the engine. Remove push rods (7). 7. Put identification marks on the bridges as to their location in the engine. Remove bridges (8) from the dowels on the cylinder head assembly.Install Rocker Shaft Assemblies & Push Rods
1. Put clean engine oil on the bridges and dowels. Install the original bridges in their respective locations. New bridges can be mixed.2. Install bridges (8) on the bridge dowels. While firmly pressing 0.5 to 4.5 kg (1 to 10 lb)straight down on the top contact surface of the bridge, turn the adjusting screw clockwise until contact is made with the valve stem. Turn the screw an additional 20 to 30 degrees(1/3 to 1/2 of 1 hex on nut). This will straighten the dowel in the guide and compensate for the slack in the threads. Hold the adjusting screw in this position, and tighten the locknut to a torque of 30