with crank walk I beleive there are some test you can do, i cant remeber them all but i beilive if you drive the car around turns you can feel the clutch not engaging and disengaging corectly.
This is from another thread, hope it helps
Symptoms are different for every car; the only consistent symptom is the engine not running in the later stages. Sometimes there will be a loud clicking sound if the crank is wobbling enough that it is hitting the crank sensor. A clutch pedal that sticks to the floor on left turns is also a typical sign.
If it isn't fixed right away...you'll have to get a new engine/bottom end when your engine dies. If it isn't fixed at all...your engine just stops running and your car stays parked 
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Don't freak out if you think you might have it...there is nothing you can do to prevent it if it has already started that is less expensive than replacing the faulty parts. A couple things you could do to help prevent it are:
1) Try to put the car in neutral as much as possible, instead of leaving the clutch in.
2) Disconnect the clutch start switch so you don't have to put the clutch in to start the car.
3) Make sure your car never gets low on oil. I remember reading a post by Kevin about how a dented oil pan starved his crank and bearings of oil enough to walk his 3rd 7 bolt...when we were doing my timing belt job I put enough blocks of wood and towels between the jack and the oil pan that it would have been comfortable to sleep on . Tips like that help so much (thanks Kevin!), and it is awesome when more experienced members share them.