What are the signs of a bad engine crankshaft?

[Rich]

Engine crankshaft failure symptoms include: no high-voltage spark, no fuel injection, failure to start the vehicle, and illumination of the engine warning light on the dashboard. The function of the engine crankshaft: It receives force transmitted from the connecting rod and converts it into torque, which is then output through the crankshaft to drive other engine accessories. The crankshaft is subjected to centrifugal force from rotating masses, periodically varying gas inertia forces, and reciprocating inertia forces, causing it to bear bending and torsional loads. The engine's function is: to convert the thermal energy of gasoline or diesel into mechanical energy by burning the fuel in a sealed cylinder, causing gas expansion that pushes the piston to perform work.