Adjuster-Rocker Arm: Description

WARNING: This page is about a different car, the 2006 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

The two rocker shafts are mounted to the top of the camshaft bearing caps. The left rocker shaft holds the eight roller rocker arms for the intake valves, while the right rocker shaft holds the four forked roller rocker arms for the exhaust valves. The roller rocker arms are mounted to rocker shafts and are positioned over the camshaft and valve stems. The rocker shaft is installed through the center of the roller rocker arms, which allows the roller rocker arms to pivot. The valve stem end of the roller rocker arms contain a hydraulic lash adjuster. The hydraulic lash adjuster, using oil pressure, constantly maintains the correct clearance between the rocker arm and camshaft/valve stem. The camshaft end of the roller rocker arm contains a roller that rides on the lobe of the camshaft. Roller rocker arms provide the camshaft with a quiet, low-friction means of opening the valves. Hydraulic lash adjusters are replaced as an assembly with the rocker arms. See Figure.