M Alternator belt

fastfarmall

Well-known Member
Does the old M, 55171, serial number, use a A width belt on the alternator or the the one smaller? The alternator has the same width pulley as the drive pulley, which sure looks like it's a A, but the old one is narrower and it run's really close to the bottom of the sheave !
 
That is one that is a who knows. If the original generator pulley was put on the alternator then it would be the wider 5/8 inch belt but if the pulley was not changed then it would be a 1/2 inch belt. Since an alternator never came on it from the factory it is hard to say what you need
 
I think the person that had put it together used a fractional horse power belt,and it charged like a dream, but it needs a A width belt to fit the drive sheave properly, which is the water pump ! Thanks guys!
 

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