1990 four winns freedom omc 3.0 stern overhearing

[zjchef25]

ok so specs are in the thread name as well as the problem. I have a stern drive OMC cobra 3.0, shes over heating intermittently, took her on the water didnt over heat, tried flushing her system after i took it out, she overheated. I took off the inlet hows coming from the stern drive while running the engine and there was no water coming up the hose ( yes i had the muffs on and water running). i can blow water out the hose and suck it up but the water does not get pushed up. i can flush water freely through thermostat housing and and engine but she still over heats.

my question is what could be wrong? impeller, thermostat, water pump. Is there something that I am missing? could an inline water pump work if i eliminate the impeller so to speak.

 

[zjchef25]

Re: 1990 four winns freedom omc 3.0 stern overhearing

so i took out the thermostat and it as rusted to crap, we had to take a torch to it for over a minute to get it to open, also the impeller was full of sand and crap....

 

[Kainon]

Re: 1990 four winns freedom omc 3.0 stern overhearing

Seems you found your problem, I would think about replacing the Impeller and possibly the assembly it there's much wear. Good LUck

 

[zjchef25]

Re: 1990 four winns freedom omc 3.0 stern overhearing

im gonna hope to god it is the solution.. while i was at work my father flushed ALOT of sand and such out of the passages of the stern drive area. the impeller and the housing area arent damaged just clogged.

 

[sea wolf]

Re: 1990 four winns freedom omc 3.0 stern overhearing

im gonna hope to god it is the solution.. while i was at work my father flushed ALOT of sand and such out of the passages of the stern drive area. the impeller and the housing area arent damaged just clogged.

I would replace the impeller. In fact, I would get the water pump kit & go thru the whole assembly. Look at the liner. Is it scored?

 

[4Winns2]

Re: 1990 four winns freedom omc 3.0 stern overhearing

The Cobra outdrive is friendly to impeller change. 20 minute job. Make sure you buy the whole kit and not just the impeller.

 

[zjchef25]

Re: 1990 four winns freedom omc 3.0 stern overhearing

The Cobra outdrive is friendly to impeller change. 20 minute job. Make sure you buy the whole kit and not just the impeller.

so far it seems to be the thermostat, but the waterpump kit is cheap and not a bad idea at all, and the impeller on the stern drive has no damage thank god.

 

[zjchef25]

Re: 1990 four winns freedom omc 3.0 stern overhearing

ok so id what the hell is wrong with it now, she was fine all day yesterday now i go to run her today to make sure all is well for tomorrow and she over heats...any suggestions, possibly firing between cylinders

 

[etech2008]

Re: 1990 four winns freedom omc 3.0 stern overhearing

I'm confused did you replace the W/p kit?

Also put the hose on the boat run it with it running take the hose coming from the transom off and look at waterflow. If waterflow poor check the hose between outdrive and back of the boat for holes.

If you have good waterflow then check the manifold and riser for clogs. If that all checks out pressure test the engine to check for head gasket fail.

Most importantly start with doing as I say the impellers in cobras are a funny thing they can not work right with minimal damage.

Good luck

 

[sea wolf]

Re: 1990 four winns freedom omc 3.0 stern overhearing

ok so id what the hell is wrong with it now, she was fine all day yesterday now i go to run her today to make sure all is well for tomorrow and she over heats...any suggestions, possibly firing between cylinders

Well, we've been telling u to replace the impeller, but u won't listen. Just because it looks ok, that doesn't mean it is. If a fin is worn it'll overheat. Are u starting the engine before or after u put water to it? Are u saying the engine is misfiring? When's the last time u did a tuneup including checking the timing?

 

[zjchef25]

Re: 1990 four winns freedom omc 3.0 stern overhearing

Well, we've been telling u to replace the impeller, but u won't listen. Just because it looks ok, that doesn't mean it is. If a fin is worn it'll overheat. Are u starting the engine before or after u put water to it? Are u saying the engine is misfiring? When's the last time u did a tuneup including checking the timing?[/QUOTE

did the time timing 2 weeks ago, the idle is rough, we decided to get the impeller for the rear, we never start the engine before we put water on her, and i do not know if i am misfiring but we are not going to rule it out

 

[zjchef25]

Re: 1990 four winns freedom omc 3.0 stern overhearing

got the new impeller, still not sucking water up to the thermostat area, we ran the engine and i pulled the hose off the inlet side of the thermo housing and got no water. is there any help or another thread depicting my problem

 

[zjchef25]

Re: 1990 four winns freedom omc 3.0 stern overhearing

ok so i have done everything yall said and its was a combination of 3 things, the impeller, the muffs that feed water were not giving enough water pressure for water to reach the impeller, and there were 3 small flat head screws that were not inplace on the the upper unit, that i noticed this morning that the wholes were leaking water, so i put them in and noticed a huge difference in the engine, and the fact that i now i have water being pulled up to the inlet hose