Automotive rocker arms are essential components of an engine’s valve train, playing a role in overall engine performance.
Rocker arms explained
Automotive rocker arms transfer the rotational motion of the camshaft into the opening and closing of the intake and exhaust valves.
These compact yet vital components are available in a range of designs, including stamped steel, die-cast, roller, shaft-mounted and pedestal-mounted rocker arms.
Example of a rocker arm. Source: Rios, CC BY-SA 4.0, via Wikimedia Commons.
High-performance engines often use shaft-mounted rocker arms for added stability, or roller rocker arms with bearings to reduce friction and improve efficiency.
Stamped steel and die-cast rocker arms are more commonly used in standard production vehicles.
Functions of engine rocker arms
The primary function of automotive rocker arms is to ensure the precise opening and closing of the engine’s valves.
Their durable, wear-resistant construction helps reduce friction within the valve train, improving efficiency and contributing to longer component life.
Signs of worn automotive rocker arms
Rocker arms operate under high temperatures and constant mechanical stress. Over time, wear can affect performance and reliability.
Common signs that replacement may be required include:
- ticking or knocking noises from the engine
- reduced engine performance
- stalling or power loss.
Where to get automotive rocker arms
Masterparts supplies automotive rocker arms (as well as rocker shafts) for most vehicle makes and models.
Cape Town and surrounds:
Gauteng:
KwaZulu-Natal:
Namibia:
Along with engine rocker parts, Masterparts offers a full range of suspension, steering, engine, braking and electronic parts for cars. Contact us if you’re looking for a specific part – our team will be happy to assist.
