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    Mercruiser 470 Knock

    My 1986 Mercruiser 470 has a k My 1986 Mercruiser 470 has a knock when started cold but goes away about 2 minutes later once it warms up to 120 degrees. Could it be a wrist pin? If I pull the number 3 plug wire the knock goes away. I dont think it is a rod bearing since it would knock all the...
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