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I have removed the water pump and found it has a bit of corrosion due to the previous owners lack of maintenance, it would probably be OK so long as I use the correct anti corrosive coolant. I would really like to replace it though and looking at it closely I notice to remove and replace the timing cover requires 2 bolts at the front of the head to be removed. My personal feeling is not to touch it unless I replace the head gasket BUT is it possible to replace the timing cover without having to touch the head.