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Did you change the pump as routine maintenance or because it stopped pumping ???
What did the old impeller look like ???
Is this a "new to you" motor ???
I just bought the engine, it had been stored for many years. I think it's a 73 model. First thing I had to do was change the power pack; the old type with the screw-in wires. Got spark, so I decided to change water pump before I put it on my boat. The old one was intact, but very dry-rotted.
Could it be the thermostat, which I don't even want to get into? Or could've wasps or ants have caused a blockage in the engine? That's all I can think of.
However, I did run the engine for a full minute and it stayed relatively cool, you could put your hand anywhere on the head and it was barely warm.
I dont know this motor so I am just generalising. There are many experts out here that will know this one inside out.
Does it have a tell tale on it ??? how do you know it is not pumping cooling water ???? is there no water flow at all that you can see ???? is it a through the prop exhaust ????
sigpicMarada 2100 Executive Series, 5 Litre V8 with Mercruiser Alpha 1 outdrive. 2007 K-Z Spree 260 RBH, all = a whole lot of family fun !!!!