aggervated and tired and need help

[jwynn]

i have a 1996 maxum 1700 with a 3.0 mercruiser with alpha one i have replaced the water pump on engine replaced impellar also replaced hose that feeds water from impellar to engine went out last sunday on lake rode for 4hrs then all of a sudden started overheating again all things replaced earlier mentioned were repalced for overheating issue oh yeah also rplaced thermostat no signs of water in oil need help if anyone has a suggestion



want to add what i found on boat this week removed exhaust manifold and riser once i removed found water ports in manifold and riser almost completely stopped up at this didnt have money to repace either one spent 3 hrs removing rust and build up from them put back together took to lake saturday ran boat ran good no overheating issues.

 

[glennwolf]

Re: aggervated and tired and need help

What did your impeller look like when you replaced it? Did you replace the entire pump in the out drive or just the impeller? Could be thermostat also or the hose from stern drive to engine could be an issue.

 

[Philster]

Re: aggervated and tired and need help

What kind of lake? What kind of bottom? What were you doing when 'all of a sudden' happened? Were you running through mud, off an island, pulling two fat guys on an old innertube, cruising at 45 MPH and 4500 rpms? What immediately preceded the overheat and what did you do in the time prior?

 

[captk]

Re: aggervated and tired and need help

how about the water pocket in the upper g/c?

 

[RL Gman]

Re: aggervated and tired and need help

1996...thats a gen II most likely, when you changed the water tube from the SS housing to the upper unit, are you sure it sat correctly and were the o-rings in good shape?

If not, the water pump will pump the water into the unit but wont pump it up into the engine...(actually, some water will make it into the engine, but def not enough to keep it cool...dont ask me how I know).

An easy way to tell, is run it on muffs...if tons of water just pours out of the exaust through the propeller, thats the problem...(granted, if my instance is the problem, you wouldnt have been able to drive long, and if you let it run too long you may have other things to look into).

 

[jwynn]

Re: aggervated and tired and need help

when i replaced impeller it was in good shape no broken pieces just hard no i didnt replace all just impeller i was running about 30 t0 40mph when it started overheating 5 people in boat not pulling anything lake pretty clean no mud no debris also i replaced double layer rubber that feeds water from lower pump to water pump on engine

 

[RL Gman]

Re: aggervated and tired and need help

Disregard what I mentioned earlier...I didnt catch this until the re-read of the original post, so now I just had a couple of questions.

Ok, I reread everything, and from what I gather, you must have a closed cooling system?

I also must have missed in the original thread that you had done all of this work because of an existing overheating problem?