No announcement yet.

Fan belt problems

  • Filter
  • Time
  • Show
Clear All
new posts

  • Fan belt problems

    Anybody run a fan belt that is not wrapped or a cogged belt. Mine developed a squeak that wasn't consistent with valve train noise nor crankshaft or rods.I have all three fan pulley, crankshaft, and alternator new with about 1500 miles on them. They look new. I never have had luck with the wrapped belts. Any suggestions?
    Attached Files

  • #2
    First, to insure it is the belt that is squeaking, remove it and run the engine to see if that is the problem. If it is, you can use soap or belt dressing to help remove the squeak, or just run the belt a bit looser.
    You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!


    • #3
      Already ran it off the engine. Look at the pictures Wiz. It's falling apart. The alternator pulley is just too small diameter for a wrapped belt. I need a cogged belt. I bought one from a place last year online for my truck, a cogged belt and it works perfect.


      • #4
        I actually have one from the auto parts house, narrower but works fine for my alternator. I just took a string and measured around the pulleys and got 3 different lengths, used the one that fit, took the other 2 back.
        You wana look waaay far up da road and plan yer route because the brakes are far more of a suggestion than a command!


        • #5
          Ok, who is your auto parts house? Is it a cogged belt?

          I think I found the place I ordered from the last time for my truck. $2.38 each. Shipping is more than the belt. I can't drive to a parts store that has one for that much. I'll post back when I get it and try it out.


          • DaWizard
            DaWizard commented
            Editing a comment
            Dennis, I think it was Auto Zone, and no, not a cogged belt.

        • #6
          The cog belt is a better choice when running an alternator. The gates # BX40 or BX42 works nice

          Fwiw ,,,,i don't like to use any belt soap or dressings as the noise usually gets worse or is temporary at best
          3 ~ Tudor's
          Henry Ford said
          "It's all nuts and bolts"

          Mitch's Auto Service ctr


          • Big hammer
            Big hammer commented
            Editing a comment
            When I was a teen had a mechanic offer too fix a squeaky belt if I bought him a coke. I did he drank most of it and poured the remaining on the belt :-(

        • #7
          Mitch, that has been my experience also. Rod
          Much of the social history of the Western world, over the past three decades, has been a history of replacing what worked with what sounded good.


          • #8
            Belts are sold by Car Quest now bought out by Advance Auto Parts here.

            These belts are for trucks and are a little wider than some and work well with the wide pulleys on Model A.
            The notches allow belt to go around the small pulleys on alternators without damage to belt.

            A notched belt is good idea on Alternators as it wraps tighter and slips less I think.

            Notched belts use a different number system

            Truck and Bus Series made by Gates

            This one fits the smaller alternator pulleys ... smaller than the ones on a stock Chevy V8 alternator

            Numbers on label are:
            11/16ths by 43-1/8th

            They are NOT wrapped and are cut rubber on the part that goes into the pulley groove.

            Last edited by benson; 08-07-2017, 11:15 AM.


            • #9
              Originally posted by DaWizard View Post
              First, to insure it is the belt that is squeaking, remove it and run the engine to see if that is the problem. If it is, you can use soap or belt dressing to help remove the squeak, or just run the belt a bit looser.
              You can also hit it with a squirt from WD-40, will stop the squeak immediately if that is the issue. Usually the belt is worn, thus riding inside the pulley not on top where it belongs.


              • #10
                I have used the BX40 with good results for many years. The internal cogs let it curve around the small alternator pully nicely.
                Eastern Connecticut


                Related Topics


                • BILL WILLIAMSON
                  EVOLUTION OF THE FAN BELT
                  by BILL WILLIAMSON
                  Thought we might talk about the change from the FLAT Model T belt, to the "V" type belt. START THINKING!!!
                  07-10-2017, 01:49 PM
                • fred93
                  Fan belt question
                  by fred93
                  I was detailing the engine compartment on a 29 Tudor that I have been restoring for a friend and I noticed that the fan belt was touching the lower radiator hose. I thought at first that the belt might be incorrect or old and stretched out. So I grabbed a new one off the shelf and it seems to be the same length (both belts have a "G 07" mark) . Can I buy a shorter belt somewhere?
                  05-23-2020, 02:21 PM
                • canadian
                  alternator pulley
                  by canadian
                  non authentic . But would anyone have approx diameter and width of a pulley to use on a GM Alternator. I can order one from vendor but because I am on the ass hole of the planet its 3 weeks delivery , just wondering if guys are using a pulley from some other application that I can get locally. thanks
                  04-10-2018, 08:39 AM
                • copgib
                  Recommended Belt for use with alternator
                  by copgib
                  I have decided to change my generator or for a alternator on my 1930 Model A. My question is: What is the best belt to buy for my new alternator? Is one better than another? Thanks Hugh
                  03-08-2019, 06:32 PM
                • Roadster Rich
                  Fan belt
                  by Roadster Rich
                  I am trapped with one car in Florida (with my Les Andrews Red Book) and one in Georgia. I think that my question would be answered with the book. I am working on the one in Georgia and need to buy a fan belt. Can anyone tell me the size and if I can just get this at an auto parts store?
                  06-21-2017, 11:11 AM
                • Bob C
                  Fan Belt
                  by Bob C
                  I saw this on Ebay and I assume it is a reproduction or NORS??

                  11-17-2019, 12:35 PM
                • Bfolven
                  Belt problem
                  by Bfolven
                  Hi, I’m rebuilding a 49 ford shoebox, with a 239 flathead, I’ve converted over to a 12 volt system and changed the generator to a chrome alternator, I’m having a problem finding the right wide 5/8 belt that goes around the alternator, water pumps, and down to the crank. A ford belt, period correct is to short. Any suggestions?
                  05-19-2020, 10:21 AM
                • Brian in Wheeling
                  Alternator and amp gauge and headlights
                  by Brian in Wheeling
                  I have what I believe is a 30 amp alt. I also have the higher CP standard bulbs in headlights ( 50/30)? When on - they peg the ampmeter to very near full discharge. Belt is tight. Something wrong?

                  10-18-2017, 07:17 PM
                • Apple Green Wheels Rule
                  Rotating squeak coming from fan belt/water pump???
                  by Apple Green Wheels Rule
                  Adjustment on the fan belt is at 1/2in when cold with leakless water pump. ????
                  08-07-2020, 12:00 PM
                • Tom Wesenberg
                  Thoughts on 1930 Blindback Sedan For Sale
                  by Tom Wesenberg
                  This car sure looks nice in the pictures. One thing I noticed right away is the belt riding a bit low in the pulleys. Normally the correct belt will ride higher in the aluminum fan. The seller mentions the belt slips at higher speed, and I'd try another belt.

                  11-10-2018, 03:41 PM