I am a newbie and just bought a 2007 C180 with only 3 hrs on it. I took out my family on a ride and accidentally hit the bottom in a very shallow area while I was going at idle speed but I panicked and tried to reverse and by doing that I sucked bunch of gravel and small rocks. I shut it off, got into the water and pushed the boat back into the deep. I started it back on and I can hear rumbling sounds which is probably all the crap that got sucked in. I drove it back home literally at idle speed but anytime I increase the throttle, I could see thin white smoke coming out the back end near the jet outlet...nothing from the exhaust and nothing in the engine compartment when I opened it.
Yesterday, I took it out of the water and I was able to get out 4 small rocks stuck between the impeller blades as well as the stationary blades post the impeller. I was able to see scratches on the impeller blades as well slight roughed edges. I put it back in the water and there was huge difference in thrust obviously and the sound was smoother like before but when I pushed the throttle further to more than 6000 rpm, I could see some smoke coming out again. Also, if I leave it on idle with steering wheel straight, I noticed the boat is turning to the left and the smoke seems to be coming out of the back end on the left side as well!
my questions are:
1- what is causing thin white smoke to come out near the jet outlet?
2- did I damage anything that must be replaced now?
3- Can I still operate the boat safely or not?
Any help is greatly appreciated.