Husqvarna 250 PS Workshop Manual page 34

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Opening the crankcase
Remove the ignition system, clutch, cylinder assembly,
piston and cylinder base gasket.
Undo the seven crankcase bolts, unscrewing them a
short distance at a time.
Fit tool 502 51 61-01 and separate the two crankcase
halves.
Use the same tool to press the crankshaft out of the
crankcase.
Drive the sealing ring out of the drive side of the
crankcase using a mandrel and remove the bearings by
applying heat.
Checking the crankshaft
The crankshaft cannot be repaired and must be replaced
if it is defective or damaged. On some crankshafts there
may be a slight blue discoloration around the crank-pin.
This is entirely normal and is due to a heat treatment
applied around the crank-pin hole.