Engine not cooling

You didm"t say what make of water pump you are using on what engine. If it is a dual impeller Sherwood AND you have recently installed new impellers, check to see that you didn't put it back in upside down. I have a Jabsco pump in my 65 Nautique on a Chrysler 318 and I have marked the top of my pump with TOP so I know that when I put it back in after a rebuild, it is in correctly.

your impeller is toast...the inlet hose, after the strainer, goes to the raw water pump...that's where the impeller is and no doubt its worn out, you will need to get a new one. Don't confuse the water pump(like in a car) with the raw water pump. Do a search for the bucket method of testing the pump. You do certainly need a thermostat even in FL.

any melted or cooked hoses need to be replaced too of course

Thank you so much! i was thinking it looks like a car engine so i was sorta treating it like one.
im curious what the bottle looking thing is after the water enters the boat from the vent on bottom. it goes vent entrance, to a bottle looking thing then to top of engine for dispersing.

Thank you all for the information.. one more question- how do i get an avatar for my posts?   

No i just uploaded one. i do not know who keith is...   but have been comin here sine 2011.

Appreciate the info. i haave received so much good information from this site it has been set as favorite for well over 2 years.

Jaxboater wrote: I actually did not rebuild anything, this boat was willed to me from a friend who i was careing for while she had cancer. it was in storage for 25+ years... it just stasrted smoking and my gauge went up to over 240 so i followed the intake "where it takes it from the river into the system and it looks like the intake pipe runs thru this little bottle like deal.

Harry welcome

So this boat has been sitting for a while? Soo lets back up a step or two and tell us what you did from sitting that long? did we do any fluid changes?
The little bottle like deal is a water stainer this filters the water,
if your boating through weeds, muck etc, this stops that stuff from entering the the system.If it gets clogged it can cause an over heat, Also where water enters the boat through the bottom check for clogs there.
The impeller is what pulls the water through the system Most of the time this is the number one cause of over heating. The impeller itself is made of rubber so since the boat has been sitting it has probably deteriorated. This is a easy do it yourself project . Do a little research on your boat all the info you need is here. Take some photos and post them when you get a chance. one more thing when a impeller brakes apart pieces will end up at the transcooler filter so you need to check that also.
Kirk

Ha I was thinking 89 for some reason to much fun yesterday?

What is the oil pressure?

You mean after the loud bang?

Oil pressure is fine... it ticks for a few second then goes away. i was thinking when i got it real hot it might have damaged the valve?

You should be fine as long as it quits ticking(lifter pumping up?) and does not start getting worse, trust me-you will know if it gets worse.

As long as you did not run it low on OIL, you are probably OK.
Never run it low on oil. Don't let the oil get to the add a quart line ever, keep it at full.

Keep an extra impeller on the boat, those things are the weak link in the system.

Don't run the boat without water going to the engine for any amount of time. Either age or lack of water or both is why your impeller failed. Replace them about every 100 hours/3 yrs--your mileage may vary.

Pete those are permanently deformed and there must be cracks on those blades, ready to fail. Good thing you replaced it. They get brittle from time. Just like us.


I would venture a guess that once deformed it will be less efficient at higher speeds especially.

It woulda blown on your speed run.

GlassSeeker wrote: Pete those are permanently deformed and there must be cracks on those blades, ready to fail. Good thing you replaced it. They get brittle from time. Just like us. I would venture a guess that once deformed it will be less efficient at higher speeds especially. It woulda blown on your speed run.

Andy,
You are correct but the point I was making was there is a BIG difference between 3 or 4 years than 25 years. Keep in mind I did not have any cooling issues ether. I was just trying to state most impeller problems come from running them dry and really not age. Plus, you will note that I have NEVER removed a impeller for winter storage both on my boats or when I worked at at a CC dealership. Removing a impeller(s) for layup is just a scam to make more money. I have to laugh back in the days when a drain only was done and the block wasn't filled with anti. The dealers would bag and label the drain plugs so the customer would have to come back for " summerizing" unless the customer was smart enough to go out and buy several NPT plugs!!