Alternator Pulley

[witty73]

Hi All,

Did little post searching, but didnt find what I needed. Im in the process of converting to an alternator on my 53 new major, as many have done before. I understand that I have the 1 inch wide belt, and some later models had a narrower belt. The problem I am having is finding a pulley to fit the almost 1 inch wide belt. I have ordered off amazon, only to return because it was made for a 3/4 inch wide belt, not 1 inch. Any ideas or advice on where to find a wider pulley to fit the GM style 10 si Alternator? Any advice is greatly appreciated.

Thanks,
Witty

[BearCreek Majors]

I believe most people just run the thinner belt.

Pat

[witty73]

Unfortunately, the other pulleys are 1 inch wide as well. Im going to try a way over priced ebay special that claims to fit a 3/4" belt. if the current belt wont fit down in deep enough, I will try going to a 3/4" belt and see how low it rides in the other pulleys.

[oehrick]

Watch out witty73, vee belts drive on the sides and an alternator will put more drag on than a dynamo, if the narrow belt rides at the bottom of the drive and w/pump pulleys it'll wear quickly and slip or break - do you know a local HSM or someone good with a lathe who could turn you up a wider pulley for the alternator ??

[Pavel]

What was your Amazon 3/4 inch pulley made of -- caste iron or pressed steel?
If the latter you could increase the gap between the flanges by pressing, or hammering, a steel rod between the flanges to widen the inner width -- not necessarily to the full 25.4 mm. If attempting this be aware that the flanges could break apart unless clamped together at their joint.
Bosch market a belt width of 22.8 mm [type 20A] which, I believe, sits fairly comfortably in the 1inch [25.4mm] crankshaft and w/pump pulleys. As a further check, the 20A belts have a depth of 13mm.

Pavel

[super6954]

Hi Witty
Just a thought here as the purists would say your" Buggering up a classic" Putting an alternator on , But it don't really bother me as for a working tractor it's better and your still saving a classic . Have you looked into changing the other pulleys to run narrow belt with used ones from a wreckers. I think all pulleys fit the crank but the front seal inside Diameter might of changed ( needs confirming one way or the other) and you would have to re mark the timing notch on the pulley outer edge, but that shouldn't be to hard .
Just kinda thinking that may be the quickest easiest way to go, instead of a nearly half right fix.
Most places stock the narrow belts so replacement might be quicker than gettin funny looks at the auto store, trying to get a wide one the right size at 4 on Sat afternoon when you need the tractor . Then waiting for someone to get it in stock as they don't carry them .

Regards Robert