Hey guys, I've got a 98 5.0 I/O Mercruiser. I've had it for a while and wanted to get more performance. It was recommended to port and polish the intake and exhaust. We found out they used abrasive material to do it like gritty sand. So I got with my friend that tunes Evenrude outboards and we decided to try it ourselves. We got a bag of sandblasting sand and hooked up into the intake and started the engine. We had to hold the gas so it would run. He wanted to let the engine suck in the sand through the intake so it would port it out and then push it out the ehxaust so it would port the exhaust manifold. I was worried that it might cause problems but he figured it'd be OK as long as we didn't hook up the water hose so it wouldn't gum up. After running the boat a while and letting it suck in sand we got about half way through a 25 lb bag. The engine light was on and the engine was bucking and kicking and sounding really weird. We stopped and hooked the engine back up normal and took off the sand supply. We tried to start it again and it was really hard. Once started it couldn't idle and kept making weird noises. We took it out and drove it up & down the river, then it started to make scraping and knocking noises.
Help! Can anyone tell me what to do! My buddy only does Evenrude outboards so he doesn't know much about Mercruiser I/O's.
Help! Can anyone tell me what to do! My buddy only does Evenrude outboards so he doesn't know much about Mercruiser I/O's.
And ran the motor without supplying it with water?
