Yanmar Alternator Belt Tension Problem

[JumbleDuck]

I did a round of sanding and polishing by hand until I realized I could just smear polishing paste on the pulleys, set the belt intentionally lose and then run the engine for a few minutes, then wipe the pulleys clean, which did a great job and no more issues with belt wear (or tension, as result thereof).

Style!

 

[Hydrozoan]

Cogged/toothed belt solved wear/dust problem on my Beta when emery-ing the pulleys had not. I reckon that traversing a small diameter pulley causes deformation of the sides of an untoothed belt which causes the wear.

 

[macd]

Cogged/toothed belt solved wear/dust problem on my Beta when emery-ing the pulleys had not. I reckon that traversing a small diameter pulley causes deformation of the sides of an untoothed belt which causes the wear.

Coincidentally, Beta it was who researched belt wear after several incidents of failure about 15 years ago. The most critical factor in belt life turned out to be engine room temperature. But equally anything that increases belt temperature will have similar effects. Deformation = internal friction = heat. Hence the benefit from toothed/cogged belts. (I think 'notched' perhaps better describes the purpose of the profile, but so long as we're all speaking from the same page...)

 

[Hydrozoan]

Coincidentally, Beta it was who researched belt wear after several incidents of failure about 15 years ago. The most critical factor in belt life turned out to be engine room temperature. But equally anything that increases belt temperature will have similar effects. Deformation = internal friction = heat. Hence the benefit from toothed/cogged belts. (I think 'notched' perhaps better describes the purpose of the profile, but so long as we're all speaking from the same page...)

Sorry - I think we've had this discussion before and I agreed that 'notched' was better, but couldn't think of the word so used cogged/toothed to cover my grey moment. When I first noticed the problem Beta gave me some thermometric strips to check but the ambient temperature did not seem to me (or to them, IIRC) to be that high - though of course I do see the deformation = internal friction = heat in the belt chain. I found simply observing the belt cross sections of plain and notched belts when bent into the curve of a small pulley pretty convincing.

 

[macd]

Sorry - I think we've had this discussion before...I found simply observing the belt cross sections of plain and notched belts when bent into the curve of a small pulley pretty convincing.

No, sorry on my part. Wasn't meaning to 'correct' you (especially from what is a widespread nomenclature). Regarding your keen observations: I was about to say something along the lines of 'What price a slo-mo camera', but I daresay most Androids offer that.

 

[macd]

Sorry - I think we've had this discussion before...I found simply observing the belt cross sections of plain and notched belts when bent into the curve of a small pulley pretty convincing.

No, sorry on my part. Wasn't meaning to 'correct' you (especially from what is a widespread nomenclature). Regarding your keen observations: I was about to say something along the lines of 'What price a slo-mo camera', but I daresay most Androids offer that.