Disintegrated fan pulley 1967 427 - NCRS Discussion Boards

Disintegrated fan pulley 1967 427

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  • Steven L.
    Infrequent User
    • March 22, 2019
    • 12

    Disintegrated fan pulley 1967 427

    Last week I asked if a repair might have had something to do with a fan pulley exploding. It seems that this was just a case of bad luck. I had my oil pan gasket and intake manifold gasket replaced due to leaking oil. 10 minutes after leaving the shop, this is what happened to my fan pulley. The piece on the top left lodged itself into the hood, coming through the other side at the front of the scoop. The car is at the body shop this week for repair.

    Thanks to those who replied letting me know the mechanic did nothing to cause this. The photo is prior to the incident.

    Attached Files
    Steve

    1967 Ermine White/Red 427/400 Convertible
    2005 Magnetic Red Coupe (previous)
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43221

    #2
    Re: Disintegrated fan pulley 1967 427

    Originally posted by Steven Levin (65754)
    Last week I asked if a repair might have had something to do with a fan pulley exploding. It seems that this was just a case of bad luck. I had my oil pan gasket and intake manifold gasket replaced due to leaking oil. 10 minutes after leaving the shop, this is what happened to my fan pulley. The piece on the top left lodged itself into the hood, coming through the other side at the front of the scoop. The car is at the body shop this week for repair.

    Thanks to those who replied letting me know the mechanic did nothing to cause this. The photo is prior to the incident.

    Steve------


    I have NEVER seen or heard of a pulley "disintegrating" like this. It does appear, though, that this pulley suffered from some corrosion damage which may or may not have been "painted over".
    In Appreciation of John Hinckley

    Comment

    • Steven L.
      Infrequent User
      • March 22, 2019
      • 12

      #3
      Re: Disintegrated fan pulley 1967 427

      Originally posted by Joe Lucia (12484)
      Steve------


      I have NEVER seen or heard of a pulley "disintegrating" like this. It does appear, though, that this pulley suffered from some corrosion damage which may or may not have been "painted over".
      Joe, the mechanic that did the gaskets has worked only on Corvettes for 42 years and said the exact same thing. Also, not the kind of thing you ever want to hear from your doctor. (I've never seen anything like THAT before)
      Steve

      1967 Ermine White/Red 427/400 Convertible
      2005 Magnetic Red Coupe (previous)

      Comment

      • Domenic T.
        Expired
        • January 29, 2010
        • 2452

        #4
        Re: Disintegrated fan pulley 1967 427

        I had the same thing happen to a fan pulley that was on a 235 6 cylinder engine.
        I contribute it to metal fatigue over the years caused by flex. Oil canning was a term used, and after time the metal gets brittle.
        That pic brought back bad memories as it stranded the whole family in the desert. Drove for a mile then stopped and let cool, until I found a ranch with a welder.

        Dom

        Comment

        • Steven L.
          Infrequent User
          • March 22, 2019
          • 12

          #5
          Re: Disintegrated fan pulley 1967 427

          Originally posted by Domenic Tallarita (51287)
          I had the same thing happen to a fan pulley that was on a 235 6 cylinder engine.
          I contribute it to metal fatigue over the years caused by flex. Oil canning was a term used, and after time the metal gets brittle.
          That pic brought back bad memories as it stranded the whole family in the desert. Drove for a mile then stopped and let cool, until I found a ranch with a welder.

          Dom
          Sorry for the bad memories. At least I was only 10 miles from the mechanic and waited an hour for a tow.

          Steve
          Steve

          1967 Ermine White/Red 427/400 Convertible
          2005 Magnetic Red Coupe (previous)

          Comment

          • Joe L.
            Beyond Control Poster
            • February 1, 1988
            • 43221

            #6
            Re: Disintegrated fan pulley 1967 427

            Originally posted by Domenic Tallarita (51287)
            I had the same thing happen to a fan pulley that was on a 235 6 cylinder engine.
            I contribute it to metal fatigue over the years caused by flex. Oil canning was a term used, and after time the metal gets brittle.
            That pic brought back bad memories as it stranded the whole family in the desert. Drove for a mile then stopped and let cool, until I found a ranch with a welder.

            Dom
            Dom-----


            I don't know how a pulley in the condition of the one shown above could be weld-repaired even for a very temporary repair.
            In Appreciation of John Hinckley

            Comment

            • Joe L.
              Beyond Control Poster
              • February 1, 1988
              • 43221

              #7
              Re: Disintegrated fan pulley 1967 427

              Originally posted by Steven Levin (65754)
              Sorry for the bad memories. At least I was only 10 miles from the mechanic and waited an hour for a tow.

              Steve
              Steve------


              Does this car have C-60? Also, can you see any portion of a GM part number on the fragments?
              In Appreciation of John Hinckley

              Comment

              • Steven L.
                Infrequent User
                • March 22, 2019
                • 12

                #8
                Re: Disintegrated fan pulley 1967 427

                Yes it does have C-60, and the only marking I can find is the letter S on the back of the pulley. I don't know if the missing fragment might have had a number on it.
                Steve

                1967 Ermine White/Red 427/400 Convertible
                2005 Magnetic Red Coupe (previous)

                Comment

                • Gary J.
                  Extremely Frequent Poster
                  • April 1, 1980
                  • 1241

                  #9
                  Re: Disintegrated fan pulley 1967 427

                  The reproduction 3 groove pulley is made out of Aluminum now, not correct for judging.

                  Comment

                  • Steven L.
                    Infrequent User
                    • March 22, 2019
                    • 12

                    #10
                    Re: Disintegrated fan pulley 1967 427

                    I'm okay with that, as long as it doesn't explode
                    Steve

                    1967 Ermine White/Red 427/400 Convertible
                    2005 Magnetic Red Coupe (previous)

                    Comment

                    • Ronald L.
                      Extremely Frequent Poster
                      • October 18, 2009
                      • 3248

                      #11
                      Re: Disintegrated fan pulley 1967 427

                      With all the loading on a very small surface area, a three groove pulley - well - you certainly would not want to over tighten the belts. Over tightened belts would definitely cause fatigue failure.
                      Joe - is the part number 3995644BF? Should be also shown in the 67 AIM under the C60 pages.

                      Comment

                      • Joe L.
                        Beyond Control Poster
                        • February 1, 1988
                        • 43221

                        #12
                        Re: Disintegrated fan pulley 1967 427

                        Originally posted by Ronald Lovelace (50931)
                        With all the loading on a very small surface area, a three groove pulley - well - you certainly would not want to over tighten the belts. Over tightened belts would definitely cause fatigue failure.
                        Joe - is the part number 3995644BF? Should be also shown in the 67 AIM under the C60 pages.
                        Ronald------


                        The original pulley for the 1967 big block with A/C was GM #3889372. That pulley was discontinued from SERVICE in June, 1971 and replaced by GM #3995644.
                        In Appreciation of John Hinckley

                        Comment

                        • Joe L.
                          Beyond Control Poster
                          • February 1, 1988
                          • 43221

                          #13
                          Re: Disintegrated fan pulley 1967 427

                          Originally posted by Steven Levin (65754)
                          Yes it does have C-60, and the only marking I can find is the letter S on the back of the pulley. I don't know if the missing fragment might have had a number on it.
                          Steven------

                          The "S" manufacturer's ID is commonly found on original GM pulleys of the period. The original pulley was GM #3889372.
                          In Appreciation of John Hinckley

                          Comment

                          • Joe L.
                            Beyond Control Poster
                            • February 1, 1988
                            • 43221

                            #14
                            Re: Disintegrated fan pulley 1967 427

                            Originally posted by Gary Jaynes (3503)
                            The reproduction 3 groove pulley is made out of Aluminum now, not correct for judging.
                            Gary------


                            Personally, I'd be very leery of using a stamped aluminum reproduction pulley. A machined aluminum pulley would be OK but, of course, its configuration would be totally non-original.
                            In Appreciation of John Hinckley

                            Comment

                            • Dick W.
                              Former NCRS Director Region IV
                              • June 30, 1985
                              • 10483

                              #15
                              Re: Disintegrated fan pulley 1967 427

                              Originally posted by Joe Lucia (12484)
                              Gary------


                              Personally, I'd be very leery of using a stamped aluminum reproduction pulley. A machined aluminum pulley would be OK but, of course, its configuration would be totally non-original.
                              I don't understand how they could stamp an aluminum pulley. The pulley would require deep draw dies and I don't think aluminum would not crack or break during the process. Long Island Corvette has the 3 grove w/AC pulley for $215.00
                              Dick Whittington

                              Comment

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