As nouns the difference between crankshaft and crankcase
is that crankshaft is a rotating shaft that drives (or is driven by) a crank while crankcase is the part of an engine that contains the crankshaft.
crankshaft
English
Noun
(
en noun)
A rotating shaft that drives (or is driven by) a crank.
crankcase
English
Noun
(
en noun)
the part of an engine that contains the crankshaft