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EFV-8 Club Forum / General Ford Discussion / 40 fan belt

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37RAGTOPMAN

09-21-2010 @ 6:15 AM

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This NAPA belt mentioned [ PART NUMBER 25-24538 ]should work from 1933 to 1938,
it also is a little tight, but not bad once you have the generator in the up right position,
its worth a try, these belts are a little wider 11/16
not 3/4 or 5/8.so it fits the width of pulleys corectly.
hope this helps some of the V8 FORD MEMBERS,
37RAGTOPMAN an KEEP on FORDIN,,,!!!!!

torpedo

09-21-2010 @ 1:42 AM

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Hello Flatheadfan,
Warmest thanks for the advice & pictures. This was very informative and helpful.
Since I am not aiming at restoring the car to show condition but nevertheless concerned with efficiency and reliability I had to compromise on buying a "modern" B belt.
Probably due to the fact that some of the components of my engine may not be US stock (block is canadian-built) + unconfirmed origin of pulleys except generator, a B55 was fitted to the car.
That is certainly more than previously advised but pumps pulleys' shape also influenced this (they are narrower than originals).
With that length, the gen is about halfway on its support arm so belt tension can be adjusted as time passes.
Once again kudos to all who helped on this matter. Hopefully this little report will help other flathead enthusiasts in their restoration projects.
Best regards.

flatheadfan

09-17-2010 @ 12:58 AM

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picture #3

flatheadfan

09-17-2010 @ 12:58 AM

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Picture #2

flatheadfan

09-17-2010 @ 12:57 AM

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B” belts will work on a flathead but they are not the best choice. “B” belts are not made for automotive use. They are designed for electric motor applications. When you compare a original Ford belt to a "B" belt the differences can be easily seen. Measurement-wise the Ford belt top width is 0.650", the "B" belt is 0.602" The bottom Ford is 0.461 and the "B" belt is 0.406". These measurements are with new belts one of which is an original Ford belt. Of course belt widths can vary slightly between different manufactures but not to extremities noted. However, without having to delve into micro-measurements the most obvious is the different slope angles of the belts created by these differences which makes for a different belt shoulder. It is this shoulder that significantly alters the efficiency of the two belts. Note pictures. When placed in a water pump pulley the Ford belt actually sits up slightly higher than the "B" belt. This is because the slope angle of the "B" belt does not have a full contact with the pulley sheaves whereas the Ford belt does. The actual "B" belt contact with the pulley is only with the top 1/8" of the belt (note chalk mark) whereas the Ford belt has full contact. Less contact, less efficiency.

What should you do if you need a belt and can't find a correct one? "B" belts will work as a "substitute" belt for the correct belt on an early flathead. However, users will find the "B" belt will need more frequent belt adjustments and tend to be somewhat noisier than an original belt. In competitive show judging the "B" belt will be easily noticed which may be a concern for those seeking a high-point restoration. There are still lots of correct belts still available but the problem is they are often age-harden from years of non-use. To complicate things even more, belts at swap meets are often found in large unmarked piles with lost identification marks or labels which can make all belts look the same after a few minutes of searching. So, if you are on a belt-hunting mission you best go with something that you can use for comparison. Oh yes, The "B" belts do have a couple of advantages over old automotive belts. They are cheaper and 'fresher."

Tom

40fordor

09-16-2010 @ 11:52 AM

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A B-51 fanbelt was a perfect fit for my stock 40 Ford.
Don

torpedo

08-26-2010 @ 12:34 PM

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Hi 37RAGTOPMAN
Thanks for your informative answer. NAPA do have an online store but I think I can source the right belt thanks to the tips you have given.
To answer your questions:
I live in France now. I bought the car when I lived in the UK (RG 127).

Thanks to all who have taken a bit of their time to answer my questions.

Cheers

This message was edited by torpedo on 8-26-10 @ 12:44 PM

TomO

08-25-2010 @ 7:47 AM

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The 33 belt is 54" inside length. A B54 would probably fit, but you may want to try a larger size to give you some adjustment.

The B on the belts describes the width x depth of the belt and the number describes the inside diameter in the USA.

Tom

kubes40

08-25-2010 @ 6:03 AM

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What size pulley do you have on your generator? There were two pulleys in 1940. Thus, two different belts.
This topic was hashed over pretty well under the '40 section' in the Club forum just a couple of weeks ago.
There are a couple of very helpful answers within it (that thread.

37RAGTOPMAN

08-25-2010 @ 5:13 AM

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hi
the NAPA belt I use part number 25-13350 this is the old part number,
I went to NAPA and the new number is 25-24538
cost $20.00 plus tax,did not have in stock,so did not see if the size was exactly the same but believe so,
said it fit 37 to 1948 FORDS and MERCURYS,various models and years,so you might want to measure to see if for you,
the old belt measured as follows
53 1/4 long,
34 degree pulley angle
11/16 wide.
its a little tight but not crazy tight to get on,
this is for a 37 85HP ENGINE,

sorry no NAPA dealers in you country.did you try Napa auto parts on line,
place a old belt around your pulleys and take a measurement on the outside,also measure your pulley width.
did you try any farm tractor dealers,
this also might be a option,
was wondering were you live,
and what V8 CHAPTER you belong to?

HOPE THIS HELPS , 37 RAGTOPMAN an KEEP ON TRUCKIN,!!!

This message was edited by 37RAGTOPMAN on 8-25-10 @ 8:51 AM

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