150 Verado overheats above 2800rpm

potter water":3fe945mk said:
Static testing of the engine in the water is going to create a much different temperature response than if you are moving through the water. You are basically lugging the engine at much lower RPM than you would experience out on the water. That is the reason that shops use test props that don't push water.

You may have fixed the problem and don't know it because of the way you are testing.

Put it on the lake and take it for a spin if you want to compare apples and apples with the times you were on the water and noticed the problem. Static testing is very hard on the engine without a dummy prop and will cause overheating.

Your shop guys should know about that potential problem and potential damage to the engine doing the testing that you are doing. Flushing the engine is one thing, but operating statically at high RPM's is not good.

Think of it as a car that has the wheels locked and you are popping the clutch. Something will give--xmission or engine overheat etc. Same thing with the testing you are doing.
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Granted you are correct, the motor is lugging. That doesn't account for the fact the temperature stabilized at 150 degrees for over 5 minutes, than all of a sudden on restart rose above 210; it's obvious a problem still exists.

This has a short duration static test, hardly enough to do damage; also recommended by Murcery Factory technician.
 
As a principle, potter water has a good point. For us shade-tree mechanics, reproducing conditions after we have made a change holds variables, of which we may not even be aware, constant.
If you think it may be a sensor problem, have you considered using an infrared thermometer to check your actual engine temps? That would also allow you to look around the engine block for a hot spot from, for example, an obstruction in part of the cooling jacket.
Indeed, a vexing problem. i hope for an answer Sat at 9!
 
Picked up the boat last Thursday, spent 3 days out with zero problems. Jeff the machanic at BassPro here in Anchorage did the work, took the boat out on the water twice to make sure it was right.
He went through everything, pulled lower unit to check water pump, pulled thermostat and bench tested, verified temp with IR, back flushed a lot of junk out, pulled and inspected poppet valve. Also replaced a couple anodes
He put in a lot of time to make sure everything was up to specs and and working as it should.
Put in a new thermostat even though the new one I installed wouldn't fail when bench tested.
Only charged me for 3 hours labor plus parts, the bill was considerable less then expected.
Second time he took the boat out ran it for 2 hours; was actually surprised he took the boat down to the Anchorage Harbor and launched it.
Not sure of specific underlying problem was causing my overheating, most likely a combination of things.
 
breausaw":2kuvurdu said:
Picked up the boat last Thursday, spent 3 days out with zero problems. Jeff the machanic at BassPro here in Anchorage did the work, took the boat out on the water twice to make sure it was right.
He went through everything, pulled lower unit to check water pump, pulled thermostat and bench tested, verified temp with IR, back flushed a lot of junk out, pulled and inspected poppet valve. Also replaced a couple anodes
He put in a lot of time to make sure everything was up to specs and and working as it should.
Put in a new thermostat even though the new one I installed wouldn't fail when bench tested.
Only charged me for 3 hours labor plus parts, the bill was considerable less then expected.
Second time he took the boat out ran it for 2 hours; was actually surprised he took the boat down to the Anchorage Harbor and launched it.
Not sure of specific underlying problem was causing my overheating, most likely a combination of things.
Click to expand...

Glad to hear it all worked out. That mechanic sounds like a "keeper". If I'm ever in need of service in the Anchorage area, I'll look him up (but first I need to get to Alaska - :lol: ).
 
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