Overheating Merc 3.0 LX 1995

[henrymbrito]

I just bought this boat 2 weeks ago and once in the lake the boat overheated at higher speeds. I noticed smoke coming out from engine compartment and could also smell like rubber burning at which point I shut it off and called it a day. I later realized I was the cause of the problem since I had started the boat for a few seconds in my garage with NO water running through. I just got a call from shop and they said in addition to the impeller being shot, they also suggest the "valve flapper" since it had also melted. $175.00 there. The mechanic said once these parts are replaced, he can then proceed and start motor and see if no other damage was done to the engine. I am hoping not. Is there a way to know if I fried the motor? While at lake, after it overheated, it would turn over but would not start. the next morning, I started it for 10 secs so it did turn over. Any suggestions are apreciated.

 

[MooseHootie]

Re: Overheating Merc 3.0 LX 1995

Did you pay attention to the temp gauge. what was it reading. Over 200 degrees will change the tension of the piston rings.

 

[henrymbrito]

Re: Overheating Merc 3.0 LX 1995

Yes, it did go over 200 deg. The mechanic said there could be a 50/50 chance that the head-gasket could be gone..by the condition of the impeller and exhaust flapper that he is replacing. There is a grommet he has to order..3-5 days of waiting before he even attemps to crank motor.

 

[DHPMARINE]

Re: Overheating Merc 3.0 LX 1995

Your 3L ngine is pretty strong,and I hope you'll be ok.Also have the shifting checked,as the shift cable goes close to the exhaust elbo,and may have heat damage.<br />DHP