Components of crank mechanism can be divide on two groups: stationary and moving.
Crankshaft – is a mechanical part performs a conversion between reciprocating motion piston and connecting rod to rotational motion. When crankshaft defecting is not possible to avoid costly repair, so you can see crankshaft repair cost here.
Engine cylinder block – is the structure, which contains the cylinders, and other parts, of an internal combustion engine.
Engine cylinder head – sits above the cylinders on top of the cylinder block in an engine.