Crankcase
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A crankcase is the housing in a piston engine that surrounds the crankshaft. In most modern engines, the crankcase is integrated into the engine block.
De Dion-Bouton engine (circa 1905) with a crankcase formed from separate castings of the upper and lower halves
Gardner 0 stationary engine (a plate acts as a safety shield but the crankshaft is not fully enclosed).
Wet sump
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Within piston engines, a wet sump is part of a lubrication system whereby the crankcase sump is used as an integral oil reservoir. An alternative system is the dry sump, whereby oil is pumped from a s
Crankcase
…that they are solely used for lubrication purposes. Most four-stroke engines use a crankcase that contains the engine's lubricating oil, as either a wet sump system or the less common dry sump system. Unlike a two-stroke (crankcase-compression) engine, the crankcase in a four-stroke engine is not used for…
Interior and oil sump of an Tohatsu MFS30B outboard motor