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Belt squeal, overheat, alarm. Help!
kylesullens posted a topic in Centurion Boat Maintenance, Performance, Troubleshooting
All summer, I would hear the loud squeal of a slipping belt. Slight increase in engine temp. If I throttled down then back up, the squealing stopped and temp returned to normal. Somewhat annoying, but didn't occur enough to stop our boating fun. Verified that it was the impeller pulley that was preventing the belt from turning. The other day, the squeal started and did not stop. Alarms sounded for engine overheat as the temp climbed to 220+. this happened several times in a 2 hour outing. read all the posts that I could find on this forum, and they all indicate a bad impeller. Bought a new (Mercruiser, not seirra) impeller and housing, and a new serpentine belt. Installed all parts and tested in the driveway (on a fake-a-lake). Worked fine for a couple of minutes, but then the loud, continued squeal. Took off the belt, and the impeller was stuck again. Was able to turn it by hand (very difficult) then it freed up. It seems that the impeller is getting 'flipped' in the housing - meaning that the fins get curled in the wrong direction and the tension on the belt is not enough to turn the pulley with enough force to 'flip' the fins in the rights direction. Though the belt is on as tight as it should be. Not sure what else to do. Don't want to take it to a shop, because they will just recommend replacing the impeller. Any experience or suggestions are appreciated! '99 Centurion Elite V-Drive, Black Scorpioin