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post #3 of Old 11-24-2012
Maine Sail
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Re: Going thru alternator belts???

On this engine there are a few possibilities.

1- You need the right length belt. Likely .5" shorter than the one you have and NAPA can supply you with a few sizes on either side until you get the right one..

2- You need to properly align the alternator with the rest of the pulleys. If you have the upgraded bracket it can be forward or aft aligned. If you have the old style alt bracket it really needs the upgrade. Most "XP" motors had the upgraded alt bracket..

3- You need to clean any rust off the crank, alt and water pump pulley belt mating surfaces..

4- You need to make sure the alternator pivot bolt is the proper size. Many of these engines shipped with bolts that were too small and allowed the alt to "twist off" under load. The pivot bolt should be a snug fit, with minimal to no slop, through all pivot holes.

5- The adjuster arm bolt should be made longer so a nut can be put on the back side of it. Simply threading into the alternator ear can lead to these bolts getting loose.

These 5 things will make a huge difference so long as the alt does not exceed the capacity of the 3/8" belt, or about 80A - 90A...

-Maine Sail / CS-36T

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