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Mr-1 thermostat

Scottintexas

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item #32 on this page shows $59.49 , it looks like the same part number,


sometimes partpak will have better prices, not sure about aftermarket replacements
 

Scottintexas

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why do you think you need a thermostat? we don't usually see many of those go bad?



.
 

buckbuck

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I agree with @Scottintexas . If your boat has been in fresh water Indiana I would not think you should have t-stat issues?
 

Seedogg

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I was just checking for reference because I had a overheat warning on starboard motor last time I was out. Today, I pulled my thermostats and this is what they looked like. Think a good cleaning will take care of it or replace them?93401
 

Scottintexas

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I'd say replace
What is on them? It almost looks like algae growing?
I might pull the anode to see what it looks like and i would definitely consider crankygypsy's closed loop flush in the faq section
 

Seedogg

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Not sure what it is. I bought it in Florida in December. It had an overheat warning during sea trial. We did the reverse method and it was fine the rest of the sea trial. I have only had it out once since purchasing it.
 

buckbuck

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I fear that same vegetation is through out your cooling system. I strongly urge you to flush those engines for a long time. @CrankyGypsy method is probably the best. You should make sure you separate the exhaust and flush flush flush.
 

CrankyGypsy

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I doubt replacing the thermostats will solve the problem. I would just clean and test those - they'll be fine. if the rubber is bad and the housing leaks, just add some Yamabond.
 

Beachbummer

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One of mine was stuck open. It took a few tries, and I learned that our Thermostat 60E-12411-01-00 is set to 50 degrees Celsius and sells for $80+...BUT

YAMAHA 6CE-12411-00-00 is 52 degrees Celsius and cheaper by more than half. works like charm so far. and 2C hotter is a rounding error.
 

WREKS

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@Seedogg If all the various flushing methods prove unsuccessful, the cylinder water jackets may be plugged. Engine overheating
 

Seedogg

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I never did update the thread, but I did get this worked out. I cleaned the thermostats and reinstalled. The entire cooling system was just fine. I could run 8500 RPM all day long with no issue. If I ran over 8500, the alert would come on. A shutdown and restart would clear it immediately. It ended up being a $200 temp sensor. I confirmed by swapping sensors with the port side and the alert followed to that motor. The part number was 6AA-85881-00-00. This part is only on the prestigious California motors I believe.
 
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