C1.5 and C2.2 Engines for Caterpillar Built Machines Caterpillar

Probable Causes

• Lubrication

• Valve train components

Recommended Actions

Lubrication

1. Ensure that the engine oil pressure is satisfactory. Low engine oil pressure can cause excessive component wear.

2. Remove the valve mechanism cover. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install" for the correct procedure.

3. Crank the engine and 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.

   Note: Do not run the engine without the valve mechanism cover.

Valve Train Components

1. Check the valve train components for correct operation. Refer to Systems Operation, Testing, and Adjusting, "Engine Valve Lash - Inspect".

2. Inspect the following components of the valve train. Refer to Disassembly and Assembly for any components that must be removed for inspection.

   • Rocker arms

   • Pushrods

   • Camshaft

   • Valve stems

   • Rocker shaft

3. Check the components for the following conditions: abnormal wear, excessive wear, straightness and cleanliness. If necessary, use new parts for replacement.