2001 Super Air Nautique gt40 possible freeze?

[charlesml3]

Let me guess: The day you had it in the water was cool and the humidity was low. The water was probably on the cool side as well. Under these conditions, you'll see the steam from the exhaust. Any boat without a surf pipe will show steam under the right conditions.

If all of your gauges are good, the engine is cooling and all of the fluids are good then you're fine. Get it out on the lake and run it up to speed. See how it does. I bet it's just fine.

-Charles

[Vtox39]

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[Vtox39]

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[SilentSeven]

Re running issues; a few quick thoughts.

1) Have you given the engine a full tune up? sensor and other issues might contribute to the gassy smell. Also, I know that the exhaust of my 97 GT-40 was a bit toxic if you got a good close whiff. For those of us familiar with cat based cars, smelling a non-cat based v-8 is...stinky. I'd likely base any problem on how well the boat runs after a tune (idle, on throttle) combined with check of the plug color...nice light coca colored plugs suggest everything is fine..

2) re the steam. As you already have evidence of freeze damage, this could be more concerning. A cracked head in particular could be letting water seep into the combustion chamber leading to a higher than typical level of steam. (On my GT-40, it really had to be pretty cold - 40s - to get even some small amount of steam) In a car, you typically discover this via loss of coolant over time but you won't have that in a raw water cooled boat. Compounding the diagnosis is the combined exhaust - if you had dual exhaust and one side steams and the other doesn't, you have a good indicator. Maybe your best bet here is to closely watch the oil cap for condensation residue (milky stuff) and pull the plugs and carefully inspect the color. Any cylinder with a water problem will have a different color plug; typically whiter in color than the rest. Residue on the cap is water into an oil galley, plug color issues is water into the combustion chamber. You will also want to see if you're leaving any oil slick..that might indicate oil leaking into the water a water galley...this is not uncommon where the oil pressure is greater than the water pressure.

Hope this helps....