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IT is a gasoline or lp, right? Diesels have different pumps. Is the water pump seal holding the water in?
The reason I ask is that I am thinking that shaft has a shoulder that runs against a block that has an oil seal for the shaft and a bushing (Where that grease fitting you ask about is greased) The front side of that block has a surface that the water pump seal rides on and there is a spring between the seal and the impeller that holds the seal against that same block. So between the shoulder on the shaft at the rear and the spring and seal on the front side there should be no end play on the shaft. Did you check that setscrew in the front cover just inboard of the water pump and make sure it gives the camshaft only about 1/4 turn of end play? Meaning you turn it in until you feel resistance then back it out 1/4 turn and lock it there with the big nut. This keeps the camshaft from walking back and forth in the block as it turns. And from experience, too much end play can result in an awful knock in about that same area.
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