The bolt is left hand thread, so turn it clockwise to remove it. The bolt is tightened to 34daNm, so you will need a means of locking the flywheel to remove and refit the bolt.
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Yesterday was trying to remove it, but no luck. Looks some one was messing with it already. The end of the bolt has rounded off, tried to bang on 18 size but no luck. :-( need some ideas...