🔍 Key Concepts

• Hydraulic valve lash adjuster function in maintaining zero clearance in the valve train • Typical lubrication source for diesel engine valve gear and rocker assemblies • Difference between a sealed component and one that depends on the engine’s oil system

💭 Think About

• Think about where the rocker arms and valve gear normally get their lubrication from in a medium-speed or high-speed diesel engine. • If the adjuster must move and react to changes in temperature and load, would it rely on a one-time fill, a grease cup, or a continuous oil supply? • Consider whether the adjuster needs the same pressure and flow characteristics as bearings and other moving parts in the valve train.

✅ Before You Answer

• Is this adjuster part of the engine’s main lubricating oil system or an isolated, sealed component? • Would grease be appropriate for a component that must respond quickly and continuously to small movements? • Does the adjuster need a controlled flow/pressure of engine oil to function properly, or is it designed to be permanently lubricated?