1. The hydraulic lash adjusters, which are located at the fulcrum (pivot point) of the No. 1 valve rocker arm sub-assemblies, each consist primarily of a plunger, plunger spring, check ball, and check ball spring.

    2. Both the engine oil that is supplied by the cylinder head and the built-in spring actuate the valve lash adjuster assemblies. The oil pressure and the spring force that act on the plunger push the No. 1 valve rocker arm sub-assemblies against the cam in order to adjust the clearance between the valve stem and the No. 1 valve rocker arm sub-assembly. This prevents the generation of noise during the opening and closing of the valves. As a result, engine noise is reduced.

      *1 No. 1 Valve Rocker Arm Sub-assembly *2 Cam
      *3 Valve Lash Adjuster Assembly *4 Plunger
      *5 Check Ball *6 Check Ball Spring
      *7 Plunger Spring - -
      *a Oil Passage - -