Components of crank mechanism can be divide on two groups: stationary and moving.
Stationary components of crank mechanism: engine cylinder block, engine head block, sump, cylinders.
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.
Flywheel – is a mechanical device designed to efficiently store crankshaft rotational energy.
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.