Yanmar 3YM30 Alternator Belt - Page 2 - SailNet Community
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post #11 of 14 Old 01-21-2012
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How can I find the Gates equivalent fan belt for my Yanmar 4JH2E? I'm going through fan belts fast because my 80 amp alternator is not aligned exactly with the belt. I need the toughest belts I can get until I can get a better alignment.
If you can still read the numbers on your existing belt, or can get them from Yanmar or a friend with the same engine, take the numbers into an auto store and they have comp charts.

If that doesn't work, take the belt off and take it with you to the auto store.

Stu Jackson, C34, 1986, M25 engine, Rocna 10 (22#)
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post #12 of 14 Old 01-21-2012
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GREETINGS EARTHLINGS . Looking at your pic. do you haVE THE CORRECT belt V section because it looks like your shredding rubber youi may need to check the sizes and compliance GO SAFE.
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post #13 of 14 Old 01-23-2012
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Quote:
Originally Posted by sorcerer33 View Post
How can I find the Gates equivalent fan belt for my Yanmar 4JH2E? I'm going through fan belts fast because my 80 amp alternator is not aligned exactly with the belt. I need the toughest belts I can get until I can get a better alignment.
Try using cogged belts instead of conventional v-belts. They have "teeth" that make them more flexible so they can transmit power better. Might help with that small misalignment.

I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.
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post #14 of 14 Old 01-23-2012
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checked the # on my spares

For my 3ym30 I have cogged belt with the following number on it
129612-42290.

The belt for the water pump is 104511-78780

This all assumes that they gave me the right spares.

Hope this helps.

Ed Reiss
Being There
Freedom F38 #154
out of Marion, MA
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