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is it the original alternator? The pulley has a small diameter, it makes the alternator rotate much faster than the engine.

I've restore mine last year and changed the main bearing. Its quite a large one for such a relatively small device, may be yours is damaged/corroded and need be replaced.

it's easy and inexpensive to replace it and can't hurt, even if the cause of the failure would be something else.

 

The shaft is pretty heavy, and if the bearing locks somehow, the weight/inertia could at the speed it turns snap your belt just like that..

73 modified Grande 351C. (Finally back on the road woohoo!) 

71 429CJ. ( In progress )

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I am sure you have checked the alignment. Might be just putting too much tension on it.

I kept rolling mine on the vert last week when I got the revs up on the engine. Was not tight enough.

When a man is in the woods and talks and no women are there is he still wrong??:P

David

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Make sure the pulleys don't have any nicks, gouges, or worn out spots in them that can damage the belt. Make sure everything is turning so the belt doesn't stop moving and burn through. In addition to being too tight, if the belt is too loose it will flop around and possibly climb the side of a pulley or catch on something.

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

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Ok I checked everything . Every think looks correct installed new belt yep it broke that's number 4. Going to look for a larger pulley for the alternator what y'all think. Thanks

20r9ylt.jpg
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How long does it take for the belts to break after you start it?

 

Do the alternator and fan turn easily and freely by hand?

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

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I do not think the dia. of the pulley will do anything must be an issue. Back up and look again close. Feel the bearings in the alternator. Got to be something you have missed. Piece of belt in the pulley??

When a man is in the woods and talks and no women are there is he still wrong??:P

David

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I agree with David, missing something.

 

How about a bent fan blade nicking the belt? Alternator or water pump locking up after it runs for a while.

 

Have you watched it while it's running? No flopping or vibrating belt? No wobbly pulleys?

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

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I'm glad you figured it out and thanks for post what the problem was, it helps others in the future. Chuck

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