'78 cobia open bow, mercruiser 165hp L6
motor had a severe oil leak but was otherwise performing well. I had it on the lake and everything was fine except it sputtered a couple of times. I slowed down for a no wake zone and the engine died. I tried for a couple of hours to get it started. It had been slow to start that morning but I had thought nothing of it. after a tow i got it home and put it on the hose. It started instantly. Then it started blowing brown smoke out the exhaust. i then checked the dipstick and found water in the oil. it looked like chocalate milk. I drained the oil and put fresh in. when i did a compression test all the cylinders were 120-130psi. The boat sat for two weeks but when i started it up again, it fired right up. i let it idle for a couple of minutes and everything seemed fine. the oil looked ok. revved it to 3000 rpm for a minute and the oil started looking milky.then the brown smoke started bellowing out of the exhaust.
the compression test leads me to believe there is nothing wrong with my head gasket. and although i haven't tested the theory further, it seems like it starts fine on the muffs but not in the water. what should i be looking at next.
motor had a severe oil leak but was otherwise performing well. I had it on the lake and everything was fine except it sputtered a couple of times. I slowed down for a no wake zone and the engine died. I tried for a couple of hours to get it started. It had been slow to start that morning but I had thought nothing of it. after a tow i got it home and put it on the hose. It started instantly. Then it started blowing brown smoke out the exhaust. i then checked the dipstick and found water in the oil. it looked like chocalate milk. I drained the oil and put fresh in. when i did a compression test all the cylinders were 120-130psi. The boat sat for two weeks but when i started it up again, it fired right up. i let it idle for a couple of minutes and everything seemed fine. the oil looked ok. revved it to 3000 rpm for a minute and the oil started looking milky.then the brown smoke started bellowing out of the exhaust.
the compression test leads me to believe there is nothing wrong with my head gasket. and although i haven't tested the theory further, it seems like it starts fine on the muffs but not in the water. what should i be looking at next.
