old time mechanic new to boating

[redman3]

Now i know why the boat was so cheap.Got this 1987<br />glasstream with a 3.0 merc inboard.She getting water in the oil pan.Change it twice and its still came back.Check compression 130 on all cylinders. Engine was cold. Spark plugs look like the eng was running pretty rich, no signs of water.Drop the pan for a look see but couldnt get it out because of no room oso used a mirror to see if i could see any problems couldnt really tell. pulled the intake and exhaust manifold and wasgoingto try to test it. was wondering what should i be looking for?? When i first got the boat she overheated because of a bad impeller Idont think that it hurt anything because it ran good all summer.In the fall i drop the oil and there was the water in the oil. Any ideas???? Could use some help on this one thaank you ffor your time. redman

 

[Bondo]

Re: old time mechanic new to boating

Places to look, ?? exhaust manifold,+ riser,... headgasket,... cracked head,... + if freeze damage the block tends to crack on the inside behind the block water drain....

 

[Capt Ken]

Re: old time mechanic new to boating

First question: Was the water mixed with the oil? If it was, then the water was in the engine when it last ran. If was unmixed, then it leaked in after your last run. Possible causes, leaking riser/manifold if water wasn't mixed. If it was mixed, then possible cause was internal crack in engine that was caused by freezing. But being the temp hasn't dropped enough in the states, I doubt that is the problem. What baffles me is the fact you said the plugs looked like they were running rich. If the water came from the exhaust area, you should have some spots of rust forming on the ends of the plugs. Is it possible that rain water leaked into the engine via the spark arrester. Those little indentions in the center makes good funnels.

 

[redman3]

Re: old time mechanic new to boating

NOw that you asked some very good questions im trying tto remember what i was looking at when i droped the oil .It was milky in color. then i change the oil and droped that oneIt was still milky but not as bad. Had to leave camp awent ahead and winterize the eng. as normal.Drop the oil agin and it was milkybut not as bad. Left the drain plug out.Went back up to camp and the pan i left under the drian plug was full of antifreeze.This was not mixed.there seem to be no water or rust on the plugs.Pulled the intake/exhaust manifold and brought it home to inspect.Dont know yet about the manifold.Going to test it tomorrow. Iguess you just plug it off and put pressure on it.THanks agin for your time in helping me with this problem. redman

 

[Capt Ken]

Re: old time mechanic new to boating

Gonna be hard to plug off the big end. What I usually do, is to set it up on a barrel and hook a hose to the front inlet. Turn the hose on slow and let the manifold fill up and run out the back. Watch the exhaust holes and see if water shows its ugly head in any of them. Could be the manifold, could be the riser. But first figure out from which direction its coming from.