First off, I am pretty new to this forum and I am VERY new to working on this engine. I'm a hobby diesel mechanic (as in i fix my own diesel cars when they break) but a lot of this is new to me..so thanks for the patience...I've learned a lot just reading around on this forum and hope to learn more!
I have a boat (from the early 70's) with a seized Mercruiser 350. I looked at where there is supposed to be a serial number but don't see one. It says 5.7 LG stamped on the motor (not sure if that is helpful). I don't know much about the history of the boat or the engine except that it was last put in the water at least 6 years ago. There were 3 drain plugs out when I got the boat. I have found two that go on each side of the engine and still need to locate where the third one is from. I'd like to see if I can get it running but this is all pretty new to me. Here is what I have done so far...
Tried turning it over by hand (not too much pressure but using a breaker bar) and it wouldn't turn. I pulled all 8 spark plugs and 2 of them (1 one each side) showed rust on the tips of the plug. I dumped in marvel mystery oil (at the suggestion of prior posts). I was able to get a lot of oil into 6 of the cylinders, but 2 of them (1 on each side) don't seem to take oil...it just dribbles out.
I gave it oil yesterday and just tried going back and forth on the bolt with a regular sized wrench..so i'm really not applying much pressure. Today I put a tiny bit more oil in and tried going back and forth on the bolt again for about a minute or so. I don't actually feel anything moving but my understanding is that at first it may only be moving the slightest bit until the oil works itself in and the rust breaks up?
Am I on the right track? Should I be letting the oil sit longer before trying to turn it over? How much pressure am I supposed to be putting on the bolt? Is the fact that there was rust on 2 of the spark plug tips a bad sign that there was water in the cylinder?
Thanks for any help!
I have a boat (from the early 70's) with a seized Mercruiser 350. I looked at where there is supposed to be a serial number but don't see one. It says 5.7 LG stamped on the motor (not sure if that is helpful). I don't know much about the history of the boat or the engine except that it was last put in the water at least 6 years ago. There were 3 drain plugs out when I got the boat. I have found two that go on each side of the engine and still need to locate where the third one is from. I'd like to see if I can get it running but this is all pretty new to me. Here is what I have done so far...
Tried turning it over by hand (not too much pressure but using a breaker bar) and it wouldn't turn. I pulled all 8 spark plugs and 2 of them (1 one each side) showed rust on the tips of the plug. I dumped in marvel mystery oil (at the suggestion of prior posts). I was able to get a lot of oil into 6 of the cylinders, but 2 of them (1 on each side) don't seem to take oil...it just dribbles out.
I gave it oil yesterday and just tried going back and forth on the bolt with a regular sized wrench..so i'm really not applying much pressure. Today I put a tiny bit more oil in and tried going back and forth on the bolt again for about a minute or so. I don't actually feel anything moving but my understanding is that at first it may only be moving the slightest bit until the oil works itself in and the rust breaks up?
Am I on the right track? Should I be letting the oil sit longer before trying to turn it over? How much pressure am I supposed to be putting on the bolt? Is the fact that there was rust on 2 of the spark plug tips a bad sign that there was water in the cylinder?
Thanks for any help!