How to open kawasaki gpz 500s water pump cover.

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Hi.. my gpz have a big problem.. water from radiator get mixed into motor lubricant and all over in the engine itself. My friend told me, the problem accured by the broken/leakage of water pump seals. i'm try to open the water pump but i can't manage it because the water pump cover to tight. i hope you all can help me on this. thanks