The valve lash adjuster assemblies, which are located at the fulcrum (pivot point) of the roller rocker arms, each consist primarily of a plunger, plunger spring, check ball, and check ball spring.
Both the engine oil that is supplied by the cylinder head and the built-in spring actuate the valve lash adjuster assembly. The oil pressure and the spring force that act on the plunger push the No. 1 valve rocker arm sub-assembly against the cam, in order to adjust the clearance between the valve stem and the No. 1 valve rocker arm. This prevents the generation of noise during the opening and closing of the valves. As a result, engine noise is reduced.
|*3||Check Ball Spring||*4||Plunger Spring|
|*5||Valve Lash Adjuster Assembly||*6||Cam|
|*7||No. 1 Valve Rocker Arm Sub-assembly||-||-|