Rocker Arm
A rocker arm is a lever in the valve train that transfers the motion of the camshaft or pushrod to the valve.
What is Rocker Arm?
Many modern engines use roller rocker arms (finger followers) with a small roller on the cam to reduce friction. One end rests on a pivot, often a hydraulic lash adjuster; the other presses on the valve. Pushrod engines use rocker arms on top of the head driven by pushrods.
How it works
As the cam lobe pushes one end of the rocker, it pivots and presses the valve open against its spring.
Why it matters for your car
Worn or dislodged rockers can cause ticking, misfires and in bad cases engine damage. Correct oil level and grade keep the pivots and rollers lubricated.
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