OMC 2.3 overheating

[stevelaunius]

I have a 1990 omc 2.3. I have checked and i am getting water to the motor from the outdrive. I pulled the thermostat out to make sure it wasnt sticking. I am at a loss. I can start the boat it will run fine under 2000 rpm. as soon as i throttle up it starts getting hot. i can pull the hose off the intake manifold and it cools down. but when i pull the hose off i have water coming out the intake and the hose from the thermostat under pressure. after i pull the hose off and it cools off i can run it all day under 2000 rpm. even in neutral above 2000 rpm it gets hot. thanks for any help.

 

[Don S]

Re: OMC 2.3 overheating

When was the last time the impeller in the outdrive was replaced? You may be getting water to the engine, but are you getting enough?

 

[stevelaunius]

Re: OMC 2.3 overheating

i checked the impeller and it looked good. the boat was fine last weekend for the first two hours. i shut it off and we ate lunch on the boat. i started it up and that is when this all happened. are there any signs i should look for on the impeller? when i pull the hose off it shoots water 3 to 4 inches in the air. when i pull the boat out of the water, should the water drain out of the motor? cause my engine keeps the water in it all the time. sorry for so many questions but this thing is baffling me.

 

[chiefalen]

Re: OMC 2.3 overheating

That pos when was the last time you pulled the riser?

And when you do pull the riser ether it's clogged or you got a flapper stuck in the exhaust. Thats where my money is riding.

But curious like Don asked when was the impeller changed last?

He says he got water under pressure when he pulls the intake hose.

Leads me to believe the engine mounted water pump is still good.

 

[Don S]

Re: OMC 2.3 overheating

checked the impeller and it looked good

.

But do you actually know what is good or bad? Lot of my customers think their impellers looked good, bur were actually junk. Did it look like new? All the vanes straighten out?,. No cracks, or wear marks?

Like I said, you may get some water, from the pump, but do you get enough to cool the engine under a good load?

 

[stevelaunius]

Re: OMC 2.3 overheating

I will admit i do not know. if you think that is a good place to start i will. i will pull it and inspect it closely in the morning. how should it look to be good?

 

[chiefalen]

Re: OMC 2.3 overheating

I never in my life just checked a impeller.

I take it apart i put a new impeller on.

Just did it to my envinrude that one looked good also.

And every 4 years a new one goes on with a new housing.

That way you know it's good. And i put oem 45 bucks for the evinrude one.

I know could have gotten after market 12-15 bucks my friends think i'm nuts.

Could you get a bad one from the factory? Sure i can also get struck bye lightning.

I could get a call from pamila anderson saying she just got to have me now.

That ain't gonna happen but i can keep hoping.

New impeller if you don't know when the last one was put on.

New t-stat, to take it out of the equation.

And if the problem is still there pull the riser look down the hole. Clogged riser, and maybe a flapper stuck in the exhaust.

 

[stevelaunius]

Re: OMC 2.3 overheating

Just wanted to thank you guys for the help. I pulled the riser today and it is completely clogged. The water jackets on the down side are closed. I am going to take it to work tonight and try to flush it. If that does not work i am just going to order a new one. Thank you again for the help.

 

[chiefalen]

Re: OMC 2.3 overheating

Your very lucky in more ways than you know.

Could have been alot worse.

Can't let this go, i have to post, that your best bet would be a new riser.

Good luck !

 

[Don S]

Re: OMC 2.3 overheating

I pulled the riser today and it is completely clogged.

That, my friend, is your manifolds and rieers saying "WE NEED REPLACED >>>>>> NOW!)
Cleaning them will take away all that rust and corrosion and probably let water into the cylinders of your engine. Thus ending their life also.
Your Choice.........

 

[stevelaunius]

Re: OMC 2.3 overheating

I have been looking for a new riser on the internet, and am having no luck finding one. I found one company in canada that has one in development stages but not ready to sell yet. anyone with any ideas I would greatly appreciate it. I would much rather fix it than band aid it. Thanks, Steve.

 

[Lodgepole]

Re: OMC 2.3 overheating

Try Best Boat Parts.com. They have the flapper too, if you need one. Don't skimp on the impeller. If you don't know how long since it was replaced, it's just good insurance. I once had one that was old but looked fine in a Johnson. Would pump at low speed but not when wound up.

 

[meesh]

Re: OMC 2.3 overheating

I,d go with Don, It's a lot cheaper now to buy manifolds and risers than a new engine later. I would also change that impeller.

 

[chiefalen]

Re: OMC 2.3 overheating

e-bay has them right now.

 

[stevelaunius]

Re: OMC 2.3 overheating

thanks for all the input. i have a new impeller and riser on the way. took the boat out this weekend through some channels and across a couple of lakes and everything worked great. as soon as the new parts come in i will put them on thanks again. Steve