Hi all,
I recently had an issue with my raw water system that is finally fixed, but I am still having overheating issues.
full story: ran engine with raw water intake closed and fried the impeller. replaced the impeller retrieved all but one vane, after a small snafu, I now have plentiful raw water coming out of the exhaust.
While I was doing this I decided to replace the engine coolant impeller (it was actually the produce of a mistake but we'll ignore that part). replacement seemed to go fine. I lost about a cup of coolant i replaced the coolant with what they PO had on the boat into the overflow container (light yellow 50/50 mix vs the orange that came out of the pump).
The engine is now overheating after about 5 min run time. I have taken the back plate off of the pump and confirmed the impeller is spinning when the engine turns (friend handcranked while I looked). I tried replacing the old impeller that was working fine, (even though i also removed and compared them and they are identical). I replaced the o ring and cannot see any leaks. My step dad held all the hoses coming into and out of the pump while engine running and said it felt like fluid was moving through all of them (but one - i think the one going from the thermostat to the pump feels cold.
I have also run the engine with the coolant fill cap open (thinking it would depressurize things and help new coolant flow in).
I removed the thermostat to try to rule out thermostat issues and it made no difference.
I wanted to try to disconnect the hose from the pump going to the engine, but i was afraid of losing all the coolant out of the engine and it was really hard to access and wasn't sure what I would do with whatever information that gained me.
When I first opened the back of the impeller after the first time it over heated it sprayed a mist of air and coolant that seemed to be under a lot of pressure. I am afraid that I have done something wrong in the process of trying to refill the coolant. I'm pretty new to engines and learning as i go, so I can never rule out having made a simple but critical mistake. I'm pretty lost at this point. I'm hoping you all might have some ideas. I really appreciate your input. thank you
I recently had an issue with my raw water system that is finally fixed, but I am still having overheating issues.
full story: ran engine with raw water intake closed and fried the impeller. replaced the impeller retrieved all but one vane, after a small snafu, I now have plentiful raw water coming out of the exhaust.
While I was doing this I decided to replace the engine coolant impeller (it was actually the produce of a mistake but we'll ignore that part). replacement seemed to go fine. I lost about a cup of coolant i replaced the coolant with what they PO had on the boat into the overflow container (light yellow 50/50 mix vs the orange that came out of the pump).
The engine is now overheating after about 5 min run time. I have taken the back plate off of the pump and confirmed the impeller is spinning when the engine turns (friend handcranked while I looked). I tried replacing the old impeller that was working fine, (even though i also removed and compared them and they are identical). I replaced the o ring and cannot see any leaks. My step dad held all the hoses coming into and out of the pump while engine running and said it felt like fluid was moving through all of them (but one - i think the one going from the thermostat to the pump feels cold.
I have also run the engine with the coolant fill cap open (thinking it would depressurize things and help new coolant flow in).
I removed the thermostat to try to rule out thermostat issues and it made no difference.
I wanted to try to disconnect the hose from the pump going to the engine, but i was afraid of losing all the coolant out of the engine and it was really hard to access and wasn't sure what I would do with whatever information that gained me.
When I first opened the back of the impeller after the first time it over heated it sprayed a mist of air and coolant that seemed to be under a lot of pressure. I am afraid that I have done something wrong in the process of trying to refill the coolant. I'm pretty new to engines and learning as i go, so I can never rule out having made a simple but critical mistake. I'm pretty lost at this point. I'm hoping you all might have some ideas. I really appreciate your input. thank you
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