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Old 04-14-2018, 03:24 PM   #1
1930.68B
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Default Fan belt size
I would like to know the correct size of the Model A fan belt. We are using the original generator and water pump pulleys. They are in all the Model A parts catalogs but the shipping doubles the cost of the belt.
Thanks
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Old 04-14-2018, 04:26 PM   #2
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Default Re: Fan belt size
Bx40
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Old 04-14-2018, 05:24 PM   #3
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Default Re: Fan belt size
Ditto B 40
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Old 04-14-2018, 05:32 PM   #4
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Default Re: Fan belt size
After looking up B 40 fan belts on eBay, it appears the belt is 43" in diameter. It is strange the B 40 would be 43", verses 40" like the name. Is the correct belt 43"?
Rusty Nelson
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Old 04-14-2018, 06:00 PM   #5
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Default Re: Fan belt size
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Originally Posted by wrndln View Post
After looking up B 40 fan belts on eBay, it appears the belt is 43" in diameter. It is strange the B 40 would be 43", verses 40" like the name. Is the correct belt 43"?
Rusty Nelson
That sounds weird! One time, when I was too far from another supply, I used a B43 to get me out of trouble. It was as close as I could get. To tension it, the generator was so far out to the left that the belt touched the rubber part lower water outlet near the radiator. I laid a piece of aluminium under the hose clip to prevent it wearing through and replaced the belt some 4,000 miles later.
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Old 04-14-2018, 07:21 PM   #6
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D&D PowerDrive B40 NAPA AUTOMOTIVE Replacement Belt https://www.amazon.com/dp/B00NUQE4I0..._eQP0Ab9R5MV51


This is the belt I got from amazon. It works fine for me. It’s been on for a few years.
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Old 04-14-2018, 10:19 PM   #7
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Default Re: Fan belt size
The "X" in the part number I mentioned above (post #2) is a cogged belt. The 43" that Rusty referred to in post #4 is the Outside diameter. I suspect that the "40" refers to the inside diameter, although I don't have one handy to measure to verify that.
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Old 04-14-2018, 10:43 PM   #8
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Default Re: Fan belt size
Add things to your parts order, and buy from a dealer so you get the correct belt. The belt angle needs to be correct as well as the width and length. The belt I bought from Bratton's in the 90's for my 28 still looks like new.
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Old 04-15-2018, 12:57 AM   #9
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The Napa one doesn’t fit very well. I and several othe people have had trouble with it.
The ones I have ordered from Snyders fit perfect.
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Old 04-16-2018, 01:52 AM   #10
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Default Re: Fan belt size
What about B fan belts. Are they the same as the A?

Manuel in Oz
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Old 04-16-2018, 05:16 PM   #11
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Default Re: Fan belt size
Nope - http://www.biedlers-belts.com/single...r-ii-belt.html
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Old 04-17-2018, 11:48 PM   #12
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Default B Fan belt size?
The chart doesn't show makes & models BP. What diameter/size is the B belt?

Manuel in Oz
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Old 04-18-2018, 05:10 PM   #13
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To be SAFE, get the one it calls for & one slightly shorter & one slightly longer! It's a LOOOOOONG walk to PEP BOYS!
Bill Tired
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Old 04-18-2018, 05:40 PM   #14
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Default Re: Fan belt size
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What about B fan belts. Are they the same as the A?

Manuel in Oz
A and B belts are the same size and, the same as used for 1940's era Chevrolets.
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Old 04-21-2018, 01:15 AM   #15
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Thanks Ursus. Never knew that....

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