Originally Posted by JimN
If it's a beautiful morning, why would you NOT take it out on the water? That speeds up the process and, well,...
If the service manager saw a damaged impeller and DIDN'T replace it, I'd be pretty PO'd. It was already out- what better time to do this? If you have three missing vanes, it can't cool the engine at idle, period. If ANY vanes were missing when the shop looked at it, I would have a serious problem and if they didn't document everything, they'd be on my S-list.
Look at it this way- the choices were to A) replace a bad impeller and you probably wouldn't have had this problem (assuming the oil cooler and raw water hoses are all clear of any obstructions) or B) leave it and let you have this problem. A costs a little but B could be expensive if the exhaust hoses are soft, the flappers and flanges are blistered and the engine cooks. If these aren't at least inspected, you're asking for trouble.
Yes, worry about the missing vanes. Never assume they're not going to cause a problem.
Look, I'm not trying to be the voice of doom and gloom but these are different from car engines because they have a raw water impeller that's not metal and can be damaged and they have rubber exhaust hoses and flappers & plastic exhaust flanges that can be melted by hot exhaust gases. If any water was going through the engine and exhaust, it's possible that they weren't damaged badly because you were only at idle but they still need to be checked and the dealer should have instructed you on what to do WRT long idle times (basically, "don't"). The oil cooler should be checked- if you find weeds and other debris, that's a likely cause for this problem.
Im going to give the dealer the benefit of the doubt, as they have known the boat from day one, and the list of checks that they did were extensive and ranged from the trailer brakes to the energy absorbers holding up the engine cover. I found one of the vanes when I drained the port manifold and there are only two missing. While draining there was some crud that came out, so the other one could possibly be destroyed beyond the point of recognition. The temperature at the gauge never fluctuated, so Im fairly confident that there was no overheating. I am on my way out the door to finish the winterization, and am going to look for the debris you were talking about. Thanks for the pointers. I may be over anlalyzing this whole deal, however I have wanted this boat for over 6 years, and well frankly, its still new to me, i absolutely love it, and I plan on skiing the my a** off with it for years to come.