OMC overheating

[m48strat]

Took my boat out for the first time this season yesterday. I barely got out of the marina and the boat started overheating. The boat started to stall, but I was able to limp back to the slip. I haven't started to troubleshoot it yet, so I thought I'd seek some advice. The engine is a 1988 3.0 OMC Cobra. any ideas where to start troubleshooting?

 

[lrlima]

Re: OMC overheating

When was the last time you changed the impeller?

 

[KaGee]

Re: OMC overheating

Impeller.

 

[m48strat]

Re: OMC overheating

Have never changed the impeller. Where is it located? Is in the outdrive, or located near the water pump?

 

[Boatin Bob]

Re: OMC overheating

Not too hard to change, do you have a manual? Boat needs to be out of the water as the impeller is near the top at the back of the outdrive. See item # 12 in the picture at this link. 1988 3.0 Cobra

 

[Manipulator]

Re: OMC overheating

I have an OMC 800 and I have a bad seal around the impeller letting water into the upper unit. How tough is it to replace the impeller and seals on a OMC 800?

 

[THE BEEF]

Re: OMC overheating

Manipulator<br />Take your time. I just pulled mine for a water pump<br />800 stringer.When you get the upper gearbox off there are 4 bolts on the bottom,remove them. Then the manual says to take a metal rod through the steering post and tap lightly.Goodluck It did'thelp one bit for me.I went in from the side and taped the lower cover off. then I had to make a slide hammer 5/16 bolt hole in the water pump housing to pull it apart.The lower gear housing came out all together then I had to drive the pump<br />housing off.It takes a little time. Replace the water pump while your at it.You won't regret it.<br />Beef

 

[m48strat]

Re: OMC overheating

Since the boat is in the slip, I decided to have the mechanic at the marina check it out. He just called, and said it's definately the impeller. You guys were right. Thanks for the help.

 

[Manipulator]

Re: OMC overheating

Thanks BEEF! I look to tackle that project this fall. Where did you get the parts at? Iboats??