winterizing Speedster 150

[michael muldowney]

I have a 2007 Speedster 150 Super-Charged in Virginia. I thought that the intercooler must obviously be using the engine closed cooling system so I didn't bother draining it. Big mistake. Turns out the intercooler uses lake water. Did this for a couple of years until the intercooler was destroyed, so that was $1,000 to fix.
That is all I have ever done to winterize besides oil and filter changes. Don't use the boat very much these days.
Looking at the shop manual, I don't see instructions for winterization, unbelievably enough. I can't even remember where I read the intercooler procedure now.
1 Where does one find the accurate info on winterization procedures?
2 Never did a thing with the exhaust, but am not aware that there has ever been an issue. Am I missing something important?
Thanks for sharing your knowledge.

 

[michael muldowney]

Oops. The intercooler drain procedure is in the Operators Guide, so that mystery is solved. Car manuals never have those kinds of details.
I removed the top (outlet) hose and poured RV antifreeze in until water and then antifreeze came out the bottom of the boat. I am optimistic that the intercooler is now filled with antifreeze even though the book procedure is slightly different.
Oops again. The exhaust is self-draining, but I was supposed to add antifreeze to the exhaust manifold. Never did it before but I suppose it is best to drive back to the lake and do so. Don't want another 1k repair.