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Cat 7FB, pinning the engine fan

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Aug 11, 2025.

  1. Aug 11, 2025 #1
    mile marker 27

    mile marker 27 Road Train Member

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    What size and length bolt to pin the fan? Does bolt thread into the hub? Can’t see the hole but it feels like a 1/4” bolt hole? IMG_6972.jpeg
     
    mile marker 27, Aug 11, 2025
    mile marker 27, Aug 11, 2025
    #1
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  3. Aug 11, 2025 #2
    mslashbar

    mslashbar Medium Load Member

    601
    808
    Jul 22, 2009
    elizabeth,co
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    5/16 x 1 grade 8
     
    mslashbar, Aug 11, 2025
    mslashbar, Aug 11, 2025
    #2
    Oxbow, Deere hunter, wore out and 1 other person Thank this.
  4. Aug 11, 2025 #3
    wore out

    wore out Numbered Classic

    16,081
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    Jun 5, 2013
    CHASIN THE DEVIL'S HERD
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    Preferably an Alan head some hubs are sorta tight to get a 1/2 inch head to turn
     
    wore out, Aug 11, 2025
    wore out, Aug 11, 2025
    #3
    mslashbar, Oxbow and Deere hunter Thank this.
  5. Aug 11, 2025 #4
    mile marker 27

    mile marker 27 Road Train Member

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    I noticed the hole in the hub, is real close to where the cast curves and a hex head won’t be giving up much room for a wrench. Preciate ya, sir. This truck doesn’t have a manual override switch to turn the fan on and I ain’t saying it needs it but I wouldn’t mind having one. I’m gonna carry a couple bolts with me just in case.
     
    mile marker 27, Aug 11, 2025
    mile marker 27, Aug 11, 2025
    #4
    Oxbow, Deere hunter and wore out Thank this.
  7. Aug 12, 2025 #5
    dirthaller

    dirthaller Road Train Member

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    Sep 22, 2011
    Coloratah
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    I tried pinning mine once and it snapped the bolt first time I accelerated. 3ZJ
     
    dirthaller, Aug 12, 2025
    dirthaller, Aug 12, 2025
    #5
  8. Aug 12, 2025 #6
    mile marker 27

    mile marker 27 Road Train Member

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    Not sure if it make a difference but mines a plastic fan.
     
    mile marker 27, Aug 12, 2025
    mile marker 27, Aug 12, 2025
    #6
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