Last weekend my engine (1993 4.3 LX mercruiser) hesitated a few times (loss of power) than finaly stalled. I tried to restart it but it wouldn't turn over like the starter was gone (i know its not the cause for the stalling). Brought the starter in and had it rebiult so i can at least test for the reason it cut out in the first place. Anyway, put it back in today and same thing, won't turn over. i was told by my car mechanic friend to take out 1 or all 6 spark plugs to then see if it would turn over. Sure enough i take out the first plug and tons of water came out, i then took out the other 2 on that same side and they were also wet. then took the first plug out of the other side and the exact same thing (tons of water from the first plug then the other 2 were wet).
I then turned it over quite a few times to get most of the water out. it seemed like it just kept coming out. I ended up cracking one of the plugs so went and got all new ones. put them in, then tried starting the engine (after getting the water out and letting it dry for a while). it fired up, ran rough for 20-30 sec then ran fine. turned it off and on many time and ran great. Seem to run even better than before with the new plugs. I gave it some throttle as well and it runs fine (i didn't drive it anywhere of course). Took out the plugs again to see if there was any water and they were dry. So my questions are, How did the water get in there????? I would like to ad that there is no water in the engine oil.
I'm guessing its not the gaskets because it happenned to both sides and there is no more water getting in the heads.
I'm guessing the block is not craked as i first assumed because it happenned to both sides and again no more water and no water in the oil.
Can water come up the exhaust and into the manifolds? The boat did come to a quick stop and lots of water did come rushing up when the boat stalled?
Is there some sort of "check valve" that stops water from coming in?
Please help!!!!! When I saw that water coming out my heart dropped. Sorry about the long post but just trying to explain in detail. thanks