WASHER-THRUST 8W6179 - Caterpillar

Note: For procedures on adjusting the valve lash and adjusting the valve bridge, see Systems Operation/Testing and Adjusting, "Valve Lash and Valve Bridge Adjustment". Consult your Cat dealer for assistance.Engine Valve Lash
Only qualified service personnel should perform this maintenance. Refer to the Systems Operation/Testing and Adjusting Manual, "Valve Lash and Valve Bridge Adjustment" article or consult your Caterpillar dealer for the complete valve lash adjustment procedure.Operation of Caterpillar engines with improper valve adjustments can reduce engine efficiency. This reduced efficiency could result in excessive fuel usage and/or shortened engine component life.
The valve bridge adjustment must be performed before making a valve lash adjustment. If the valve lash is within the tolerance, an adjustment of the valve lash is NOT necessary.Perform the valve lash setting when the engine is cold. After the engine has been shut down and the valve covers are removed, the engine is considered cold. Before performing maintenance, prevent the entry of foreign matter into the top of the cylinder head and the valve mechanism. Thoroughly clean the area around the valve mechanism covers.For the valve lash setting, see Systems Operation/Testing and Adjusting, "Valve Lash and Valve Bridge Adjustment".