I am trying to determine the correct tension for the small belt that drives the Sea Water pump on a Yanmar 3YM30. I can find references in the "Handy" manual for the V Belt Tension, but not the small belt that drives the Sea Water Pump. Thanks
Yanmar Sea Water Pump Belt Tension
- Thread starter Everett14920
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Everett
You should be able to press about 1/2" of deflection midway between the pullys. Pat McCartin Inland Marine Diesel Buford, Ga imd_ga@hotmail.com
You should be able to press about 1/2" of deflection midway between the pullys. Pat McCartin Inland Marine Diesel Buford, Ga imd_ga@hotmail.com
To me...
... the trick is getting the belt just tight enough to run the pump, and not slip, at full throttle. Too tight and you shorten the life of the belt (and probably the pump, too). If you are lucky, you'll notice black powder residue in the engine compartment and know to loosen the belt. It its too loose, it will of course slip and you risk engine overheating. In addition to trying to figure how to measure the 1/2 in as noted below, what works for me is to tighten the belt until I'm able to twist it 90-degrees. In the end, every engine is different so you really just have to keep playing with the tension -- and looking at the engine while its running -- to find the sweet spot for you boat.
... the trick is getting the belt just tight enough to run the pump, and not slip, at full throttle. Too tight and you shorten the life of the belt (and probably the pump, too). If you are lucky, you'll notice black powder residue in the engine compartment and know to loosen the belt. It its too loose, it will of course slip and you risk engine overheating. In addition to trying to figure how to measure the 1/2 in as noted below, what works for me is to tighten the belt until I'm able to twist it 90-degrees. In the end, every engine is different so you really just have to keep playing with the tension -- and looking at the engine while its running -- to find the sweet spot for you boat.
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