What car?
Mine is a <span style="font-weight: bold">very</span> snug fit on the crankshaft, which I understand is the way it is supposed to be. That way it is still tight when the engine warms up. Don't recall what the instructions were, but I installed it by tightening each bolt in a criss-cross pattern, a fraction of a turn at a time. To remove it, I heated it up with a propane torch until it slid off easily.