Hello all,
I am new to using forums, so please forgive me if I do not follow the protocol correctly.
I have read extensively into the issue I am having, but as always, every situation is slightly different than the last. So rather than assume i know what I am doing now, I was hoping that I could just put my little story out there and see what you all have to say!
My 2000 Yamaha 115:
After a few minutes of cruising at 4000-4400 rpm, the following symptoms occur simultaneously:
Symptoms
"hot water indicator" on my dash will begin to flash
The audible alarm will sound
The engine seems to choke itself
As I pull back the throttle and return to slightly above idle, the engine cools and alarms terminate almost immediately. The tell tale pee stream is strong and cool, the top of the lower unit also cool to the touch. I have not yet been brave enough to lay my hands on the potentially burning hot heads, but the engine cover itself does not feel particularly warm.
Recent Repairs
I just did a full waterpump replacement kit and thermostats. The stats really didnt look too bad (maybe im just telling myself that to avoid pulling the heads to check for blockage)
Questions:
1. Is it possible that the Pressure Relief (or "poppet"?) Valve could be causing overheating at high rpm? (Most of the info about these valves is for engines overheating at lower rpm)
2. If the prv IS something i should be looking into, where the heck is it? and can i do this myself? Could I inspect the "screen" thats in there and not need to replace the valve?
3. Isn't there another way to clean the heads without pulling them? I really dont think that is something I can handle. Has anyone had any success flushing the engine in a bucket with some sort of salt deposit remover?
4. Could it just be faulty temperature sensors?(don't know if there is such a thing, just wishful thinking)
5. Could it be something silly? Like maybe i put the little plastic screen on the lower unit back on backwards after I cleaned everything during the waterpump replacement... Maybe the impeller is in backwards (99.999% impossible)? Im desperate not to pull the heads.
6. What should I do next?
Thank you for any advice!
Andrew
I am new to using forums, so please forgive me if I do not follow the protocol correctly.
I have read extensively into the issue I am having, but as always, every situation is slightly different than the last. So rather than assume i know what I am doing now, I was hoping that I could just put my little story out there and see what you all have to say!
My 2000 Yamaha 115:
After a few minutes of cruising at 4000-4400 rpm, the following symptoms occur simultaneously:
Symptoms
"hot water indicator" on my dash will begin to flash
The audible alarm will sound
The engine seems to choke itself
As I pull back the throttle and return to slightly above idle, the engine cools and alarms terminate almost immediately. The tell tale pee stream is strong and cool, the top of the lower unit also cool to the touch. I have not yet been brave enough to lay my hands on the potentially burning hot heads, but the engine cover itself does not feel particularly warm.
Recent Repairs
I just did a full waterpump replacement kit and thermostats. The stats really didnt look too bad (maybe im just telling myself that to avoid pulling the heads to check for blockage)
Questions:
1. Is it possible that the Pressure Relief (or "poppet"?) Valve could be causing overheating at high rpm? (Most of the info about these valves is for engines overheating at lower rpm)
2. If the prv IS something i should be looking into, where the heck is it? and can i do this myself? Could I inspect the "screen" thats in there and not need to replace the valve?
3. Isn't there another way to clean the heads without pulling them? I really dont think that is something I can handle. Has anyone had any success flushing the engine in a bucket with some sort of salt deposit remover?
4. Could it just be faulty temperature sensors?(don't know if there is such a thing, just wishful thinking)
5. Could it be something silly? Like maybe i put the little plastic screen on the lower unit back on backwards after I cleaned everything during the waterpump replacement... Maybe the impeller is in backwards (99.999% impossible)? Im desperate not to pull the heads.
6. What should I do next?
Thank you for any advice!
Andrew
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