I have a 1993 4.3 mercruiser on a 1850 bayliner. 3 weeks ago I developed a tapping sound while I was out on the water running the boat at WOT. I brought the boat back to the house and through a pair of muffs on it. Using a wooden stick, the sound was closest to the sound of a lifter. So I replaced all the lifters and put everything back together. (Yes new gaskets and everything torqued to specs). As soon as I started the boat the noise came back.
I was told if it's a rod knock, pulling each spark plug wire will reduce the noise in the offended cylinder. But, when I pull cylinder #6. Even at idle the noise turns from a slight knock to a louder deep hollow knock. Does anyone have any ideas? Time to pull the motor and rebuild? Thank for the help
I was told if it's a rod knock, pulling each spark plug wire will reduce the noise in the offended cylinder. But, when I pull cylinder #6. Even at idle the noise turns from a slight knock to a louder deep hollow knock. Does anyone have any ideas? Time to pull the motor and rebuild? Thank for the help
