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Old 06-06-2014, 11:44   #1
RDW
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belt breaking

I have a Yanmar 51 horse. I shreaded a belt to the water pump and alternator in November on a trip from Virginia to St. Martin. Only sign of problem was engine overheating. No noise no smell. Changed the belt with no trouble. Checked the belts before the return trip, OK.
On trip back broke the same belt, replaced and did well, checked a couple of times, OK. There are 4 other belts in front of the broken one. Belts are close but not touching.
What is the likely cause that I can check into?
Bob
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Old 06-06-2014, 11:58   #2
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Re: belt breaking

Does it have a hi amp alternator on it?
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Old 06-06-2014, 11:58   #3
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Re: belt breaking

Quote:
Originally Posted by RDW View Post
I have a Yanmar 51 horse. I shreaded a belt to the water pump and alternator in November on a trip from Virginia to St. Martin. Only sign of problem was engine overheating. No noise no smell. Changed the belt with no trouble. Checked the belts before the return trip, OK.
On trip back broke the same belt, replaced and did well, checked a couple of times, OK. There are 4 other belts in front of the broken one. Belts are close but not touching.
What is the likely cause that I can check into?
Bob
miss ailighnment or insufficient tension
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Old 06-06-2014, 12:00   #4
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Re: belt breaking

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Originally Posted by atoll View Post
miss ailighnment or insufficient tension
+ or too much tension or a poor quality belt, buy Gates.
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Old 06-06-2014, 12:11   #5
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Re: belt breaking

Was Gates belt from NAPA
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Old 06-06-2014, 12:13   #6
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Re: belt breaking

tension was good by my judgement, no sound, seems to be aligned and all belt running along side each other.
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Old 06-06-2014, 12:14   #7
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Re: belt breaking

low (80) amp alternator on belt, high amp 160 on other belt.
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Old 06-06-2014, 12:16   #8
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Re: belt breaking

Main reasons for belt wear:
Misalignment. (Use straight edge)
Corroded Pulleys. (Abrasive)
Overloaded power. (Bigger Alternator same belt)
Incorrect tension. (too tight = heat, too loose = heat)
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Old 06-06-2014, 12:30   #9
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Re: belt breaking

Water pump beginning to sieze?
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Old 06-06-2014, 15:02   #10
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Re: belt breaking

Take the belt off and feel all around the pully groove. I have seen a mark like someone used a pry bar to tighten the belt and nicked the pulley. Turned it into a shredder but it was hard to find. Pulled my hair out checking alignment and everything else.

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