(in an internal-combustion engine) the housing that encloses the crankshaft, connecting rods, and allied parts.

1875–80; crank1 + case2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
crankcase (ˈkræŋkˌkeɪs)
the metal housing that encloses the crankshaft, connecting rods, etc, in an internal-combustion engine, reciprocating pump, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
There is sufficient oil in the crankcase and even a brand new sparkplug, bright
  and shiny.
The worry is that condensation from a crankcase ventilation port could seep
  into the brake system vacuum port and freeze.
In a radial engine, the cylinders are arranged in a circular fashion around the
They also reduce oil consumption and oil spotting by separating liquid oil from
  the gases and returning it to the crankcase.
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