Checking The Crankshaft - Husqvarna 50 Workshop Manual

Checking the Crankshaft

The crankshaft is not serviceable and must be
exchanged if defective. Some crankshafts may have a
slight blue discoloration around the crank pin. This is a
normal condition caused by the heat treatment around
the crank pin hole during assembly.
Very carefully inspect the connecting rod big-end (crank
pin) bearing. Hold the connecting rod flush against one
crank half and then the other while rotating the rod
around the pin. Look for cracks or other damage to the
bearing cage. Examine the connecting rod big-end for
seizure marks on the sides or discoloration.
Check for radial movement (up and down play) of the
connecting rod. Replace the crankshaft if radial
movement is detected. Slight axial movement
(side-to-side) is acceptable.