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Old 19-01-2007, 09:21   #1
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Yanmar 4JH3E belts

Can someone please help me with the belt size on the 4JH3E. The Yanmar belts seem to stretch something awful and I would like to replace it with a Gates or Dayco cog type belt. I did this on my 3GM30F and it worked much better. Unfortunately I am 1500 miles from the boat right now and would like to take a couple of new belts with me when I go back to the boat. The Yanmar number doesn't tell me much. Thanks.
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Old 08-10-2021, 23:27   #2
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Re: Yanmar 4JH3E belts

I have just replaced my belt with a cogged Mitsubishi 6460 belt,also have as back up a Pix A45,smooth belt.Both are better than the standard Yanmar belt
The a 45 refers to the inside circumference of the belt in inches.The outside circumference would be 47.5 inches.On my 4jh3e I have an 80 amp alternator.These belts fit well and give plenty of room for adjustment after the belt will invariably stretch.
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Old 10-10-2021, 05:04   #3
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Re: Yanmar 4JH3E belts

If you want the cogged version to go around a small pulley, then the classification is AX45.
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