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Hello all i have recently replaced my 120 mercruier with a 140 after thinking that i threw a rod bearing. Come to find out after putting a load on the 140 the same knock returned with some other surprises. When i hit 2000 on the tach the engine started sliping and increased rpms. My question is...
Hey guys, I have a 1981 120 Mercruiser that is running fine but after wot last weekend developed a knock. I pulled valve cover and without spark turned engine over, everything seems to be fine. I then ran the engine and started to remove one plug at a time, noise changed on cilinder #4 but did...