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Hay John T

F

Fudd

Member
It was a decent day today so I found a spot in the
sun to relax and watch the birds. I was looking at
my JD 50 and it's alternator and the thought struck
me, are alternators directional? I guess I had
never had that come up. Thanks and Merry
Christmas.
 
Paul is correct. the fan is going to be incorrect to cool it properly. I run one backwards on a modified Sprite. I found a fan I could reverse and space to be correct. Jim
 
Was just wondering the same thing myself yesterday as I replaced one on my ford 641. It was right at a year old but the cheapest reman autozone had. So should the fan be pushing air back thru the body of the unit or pulling it forward?? Seems the back would be where the heat is.
 
I ran one backwards on a boat engine, never had a problem with it. 1946 27ft Elco 6 cyl Chrysler Marine with a V drive. Lots of memories made with that old boat!
 
Mornin Fudd man, Im just getting back in the groove after Christmas, alternators are NOT my cup of tea (Im more into AC distribution and tractor DC electricals), but what I've read agrees with the others. I don't think they will cool quite the same if rotated backwards, but subject to the load and the ambient conditions you may never notice the difference. In theory, the brush/slip ring arrangement involves a smooth unsegmented commutator (unlike a DC Generator) and youre still rotating a magnetic field (rotor) which induces AC voltage into the fixed stator which the diodes rectify back over to DC.

if this is wrong NO WARRANTY lol

John T
 
"Only the cooling fan."

Doesn"t hurt to use a bit of loctite on the pulley nut.

The pulleys on most alternators are not keyed, and reverse rotation will try to spin the nut off.
 
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