How to remove the crankcase pully and procedure for aligning timing marks thanks on 2003 Subaru Forester

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car stopped would not start tried to start several times. Removed the drivers side cover for timing belt found teeth from pully sheared off. How can a interferance and non interference engine be identified?
(1) Answer
we use a breaker bar and socket and lock the flywheel from the rear and break it loose.
subaru is a non interference motor or a free wheeler.