Rocker covers
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Rocker Covers, in relation to the internal combustion engine, are covers that are bolted on over rocker arms. Called a valve cover in the United States.
In early engines, these covers did not exist. As the rocker arms are critical to having the intake and exhaust valves operate, it was necessary to keep them constantly oiled. With these early engines, they would have to be frequently oiled as the oil was constantly being thrown off or contaminated with dirt from the outside environment. The rocker cover was created to both keep the oil in, and the dirt out. This part is now found on virtually every existing internal combustion engine today.
