FACING-STER CL 6Y7166 - Caterpillar

Probable Causes
Lubrication
Valve lash
Valve train componentsRecommended Actions
Lubrication
Remove the valve mechanism covers. Refer to the engine's Disassembly and Assembly manual for the correct procedure.
Check the lubrication in the valve compartment. Ensure that there is adequate engine oil flow in the valve compartment. The passages for the engine oil must be clean. Valve Lash
Adjust the engine valve lash. Refer to the engine's Systems Operation/Testing and Adjusting manual for the correct procedure.Valve Train Components
Inspect the following components of the valve train:
Rocker arms
Roller followers (rocker arm)
Camshaft
Valve stems
Valve guides
Rocker shafts
Check the components for the following conditions: abnormal wear, excessive wear, straightness and cleanliness. Replace parts, if necessary. Note: If you replace the camshaft, you must also replace the roller followers (rocker arm).
Adjust the engine valve lash. Refer to the engine's Systems Operation/Testing and Adjusting manual for the correct procedure.