The fan belt on my 1951 F1 (flathead 6) needs to be replaced. Not sure the existing belt is the right size (measures 3/4 by 42 and 3/4 best I can tell). What size belt fits this engine and where can I get it?

 

Welcome to the forum!

NAPA and many other stores carry it. Looks like yours is the right one.

https://www.napaonline.com/Catalog/C...+50028+2028079

 

I work at a CAQUEST
I used a gates belt green stripe

TR28423 nice heavy belt that fills the pulley

I had a 5/8 belt tha t would slip
Joe

 

My son (15 years old) and his stepdad are doing the work on the truck. They got a fan belt that fits. Thanks to you both for the info. I bought an alternator from Mac's that has the same shape as the generator. Unfortunately, the brackets are not sturdy enough, and one of them bends when you tighten the tension. I have a call into Mac's. In the meantime, we might have to use a piece of angle iron behind part of the bracket so it won't give.

 

Ease up on the tension, the water pumps don't like a lot of force. As long as it isn't squealing under load, it's enough.