Good luck ... that's one hell of a job. Are they leaking? If not, I would leave it. You still have the flywheel on? If so, a socket or extension of or something can be used to lock it.
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2007 BMW 328Xi Touring, 6 speed
Mind you that crank bolt is extremly tight. And I have broken impact sockets on pully bolts. Not sure what cars they were but yea. Have fun. Also a chain wrench will work best.