Maybe your alternator is old, the bearings are worn, if so the brushes are
probably worn as well, and you should replace both?
When I burned my diodes, I considered sending it for a rebuild but then I
was quoted up to $ 200.00 +
Then I looked on eBay: How about 85.00 bucks shipped brand spankin' new?
That's right, I bought a brand new 80 or 90 amp genuine Hitachi Alternator
(Original OEM for Yanmar you just have to find the cross reference) on
Ebay for about 85 bucks shipped. For my uses, a high amp setup was not
worth the extra expense / work on retro-fitting proper wider pulleys,
bigger belts, re-wiring with heavy wires, new regulator, etc, etc, etc..
I installed it in about 45 minutes total. Tensioning the belt was a 2
minutes complete no-brainer. Honestly I don't even remember if I tightened
it by hand or may have used a large screwdriver as a lever. The required
tension is just not that tight..
The longest part of the deal was sanding / polishing the inside of the
pulleys as they had rusted from lack of use by prior owners.. That's what
my particular problem was besides burnt diodes from a brain fart twisting
the ignition key while the (Diesel) engine was running..
If your pulleys show rust, they will eat the belt. The belt cannot
sufficiently polish the pulleys from just running,, Again, a few minutes of
quality time with various grit sand paper will do the trick.
So for about 100 bucks and 45 minutes of sweating I had a brand new
alternator, polished pulleys, and a brand new belt. I just checked it this
past weekend: After a full year of usage everything is still "peachy king"
spot on :-)
-Francois
1990 34+ "Take Five"
Lake Lanier, Georgia.
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