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I have twin inboard Merc Cruiser where the serpentine belts seem to be wearing out quickly
Port Engine had 2 replaced in 1 month. Installer did not install the second one correctly

My question is this. Is there any alignment issues with these pulleys once you replace the belts. Seems strange the wear when I am only putting about 20-30 hours on each engine per season.

Thanks

You answered your own problem in the question. Only 20-30 hours a year does more damage than 200 a year. Rubber hates sitting idle, especially belts. You can you try a better quality belt like Goodyear gatorback. Let a car sit and only drive it 1200 miles a year and see what happens. After about 2-3 years of that it's ready for the junkyard.

I would also take a good look at all your rubber hoses and check for dry rot/cracks. Squeeze them around clamps and bends you'll probably find hair line cracks and they will all need replacing.

If you don't have the ability to boat more, have a friend/marina start it up and run it for an hour every couple weeks. Run all the systems, flip all the switches. Any/all little running issues that might arise or have happened will disappear.

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1981 Columbia 8.7
2015 Yamaha FZR - 87mph - sold
2006 Yamaha GP1300R - sold
2003 Chaparral 215 SSI - sold
2009 Stingray 195CS - sold
2000 Four Winns H180 - sold
1976 O'day Daysailer II - sold
Rick's Four Winns H180 Mods/Upgrade Thread

Any oxidation on the pulleys themselves? Often surface rust on the pulleys turn them in big belt sanders causing premature wear on the belts.

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2009 358 Vista

Check your pulleys for wear. Rust or feel the sides of them make sure they are smooth as a baby's....... If not take some emery cloth and see if that help if not replace the pulley(s) in question

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2001 328 Vista "Nauta Dream 2"
AB Inflatable 10AL "Little Dreamer"
2000 248 Vista
1997 225 Sundowner


Mike

+1 on checking the pulleys. Also check that the pulleys don't have any old belt left in the grooves had that problem with my truck went through two belts before I noticed the build up in the grooves. Check the tensioner pulley just to make sure the bearings are still good and it turns freely.

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'96 200 Horizon 5.8l VP/SX

i had a similar problem with my 258 5.ogxi my problem was the power steering pump was misaligned realigned it and never had a prob since