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Michel your not getting much help so far. I can tell you how to get the timing belt off a 56/57 Mark 55. First align the timing marks and take a picture or do some thing to help remember how they were aligned. Turn the motor over slowly the timing marks should be easy to see. Take the nut off the distributor pulley that the belt runs on. Take the nut off the flywheel and use a puller to get it loose. Lift the distributor pulley up and off to get some slack in the belt. The flywheel and belt should lift right off. When you put it back on it might take a couple tries to get the belt on the right cogs so the timing marks align.
Nothing is easy on a Mercury!
dale