My 2007 Chaparral 256ssi (8.1) has been a nightmare. Last summer i had to replace the engine due to what i believe was a lean fuel ignition causing a broken piston. I had the entire engine rebuilt and put it back in. I got it all together and running and put the boat in the water. I had it out for 20 minutes and seized up the upper out drive. Some how i lost nearly all of the oil. I know for a fact that i put the correct amount in because i had the container still.
4K later, i have the boat all back together. I replaced the starter as well at this point because the old one had a loose connector on the solenoid and i just figured i would get it all over with at once. When i started the engine with the new out drive and starter, it turned once and then the starter just started to grind. I took the starter out and found that it had chewed up the flywheel. I ran the starter on a bench and found it was not engaging fully causing it to trash the gear on my flywheel. Now the engine has to come out again. I was able to replace just the ring gear on the flywheel. I finally got it all back together and got the boat in the water.
At this point everything seemed ok with one exception. The boat seems to run very rough at 800 - 1200 rpms. Below or above that it seems fine. It almost seems as if it is misfiring. Once i get about 1200, it it fine. I also noticed that once in a great while, when i start the engine, it seems to jump around. Almost as if it is only running on 3 cylinders. If i shut it off and restart it, it is find until the next random time it does it. if it starts normally (99%) of the time, it is fine. That one in a hundred times, it dances until i shut it off which is always immediately. Then i restart it and its good to go.
Here is what i am thinking. Since changed the ring gear on the flywheel, maybe i screwed up the balance? Im wondering if that could be the cause of the dancing and well as the rough run at 8-1200 rpm.
Any thoughts?
4K later, i have the boat all back together. I replaced the starter as well at this point because the old one had a loose connector on the solenoid and i just figured i would get it all over with at once. When i started the engine with the new out drive and starter, it turned once and then the starter just started to grind. I took the starter out and found that it had chewed up the flywheel. I ran the starter on a bench and found it was not engaging fully causing it to trash the gear on my flywheel. Now the engine has to come out again. I was able to replace just the ring gear on the flywheel. I finally got it all back together and got the boat in the water.
At this point everything seemed ok with one exception. The boat seems to run very rough at 800 - 1200 rpms. Below or above that it seems fine. It almost seems as if it is misfiring. Once i get about 1200, it it fine. I also noticed that once in a great while, when i start the engine, it seems to jump around. Almost as if it is only running on 3 cylinders. If i shut it off and restart it, it is find until the next random time it does it. if it starts normally (99%) of the time, it is fine. That one in a hundred times, it dances until i shut it off which is always immediately. Then i restart it and its good to go.
Here is what i am thinking. Since changed the ring gear on the flywheel, maybe i screwed up the balance? Im wondering if that could be the cause of the dancing and well as the rough run at 8-1200 rpm.
Any thoughts?