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Rocker covers did not exist in early engines, which had exposed intake and exhaust valves (for ease of lubrication). With the advance of central lubrication rocker covers were added to keep the oil in and dirt out. They are effectively ubiquitous today.
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On modern engines without rocker arms they are internationally known as "valve cover" but are sometimes referred to as a "cam cover" or "timing cover" if they also cover the timing gear(s) and belt or chain.
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Very large multi-cylinder engines, such as those used in a ship or in aviation, may have one rocker cover for each cylinder, to make removal and installation more manageable.
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aircraft engine, with the rocker box cover of one cylinder (of the two visible) removed to expose its rocker arms for inspection
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Powered by Ford" labeled rocker (valve) cover (lower left)
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in the US and Canada) is used to seal the joint between the cover and
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is used to seal the joint between the head and the engine block.
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176:. Engines with more than one head (such as a
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265:Bickford, John H. (1998).
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