LINK AS 2774381 - Caterpillar

Assembly Procedure
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Ensure that all components are clean and free from wear and damage. Refer to Specifications, "Rocker Shaft" for more information. If necessary, replace any components that are worn or damaged.
Illustration 1 g02179054
If necessary, follow Step 2.a through Step 2.b in order to install threaded inserts (1) to the rocker arms.
Loosely install threaded inserts (1) to rocker arm assembly (4) and rocker arm assembly (5). Note: The components must be reinstalled in the original location. Do not interchange components.
Install guide (6) onto threaded inserts (1). Note: Ensure that ALL threaded inserts are fully unscrewed after the installation of the guide .
Lubricate the bore of rocker arm assemblies (4) for the inlet valve with clean engine oil.
Lubricate the bore of rocker arm assemblies (5) for the exhaust valve with clean engine oil.
Lubricate rocker shaft (7) with clean engine oil.
If necessary, install retaining clip (2) and spring (3) to the front end of rocker shaft (7).
Install rocker arm assembly (4) for number 1 inlet valve to the rocker shaft. Install rocker arm assembly (5) for number 1 exhaust valve to rocker shaft (7). Note: The rocker arm assembly for the inlet valve is longer than the rocker arm assembly for the exhaust valve. Used components should be installed in the original location.
Improper assembly of parts that are spring loaded can cause bodily injury.To prevent possible injury, follow the established assembly procedure and wear protective equipment.
Install retaining clip (8) to rocker shaft (7).
Install spring (9) to rocker shaft (7).
Install rocker arm assembly (4) for number 2 inlet valve to the rocker shaft. Install rocker arm assembly (5) for number 2 exhaust valve to rocker shaft (7). Note: The rocker arm assembly for the inlet valve is longer than the rocker arm assembly for the exhaust valve. Used components should be installed in the original location.
Repeat Step 8 through Step 10 in order to assemble the remaining components to rocker shaft (7). End By:
Install the rocker shaft assembly. Refer to Disassembly and Assembly, "Rocker Shaft and Pushrod - Install" for the correct procedure.