PIPE 2676785 - Caterpillar

Probable Causes
Lubrication
Inadequate lubricationValve Train Components
Worn valve train componentsValve Lash
Incorrect valve lashRecommended Actions
Inadequate Lubrication
Remove the valve mechanism covers. Refer to Disassembly and Assembly for removing the valve mechanism cover. 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.Worn Valve Train Components
Inspect the following components of the valve train:
Rocker arms
Pushrods
Valve lifters
Camshaft
Valve stems
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 valve lifters.Incorrect Valve Lash
Check the engine valve lash. If necessary, adjust the engine valve lash. Refer to Systems Operation/Testing and Adjusting for information on adjusting the engine valve lash.