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Motor Mount Bolts

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Austin264, Jul 22, 2024.

  1. Jul 22, 2024 #1
    Austin264

    Austin264 Bobtail Member

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    Ok hoping to maybe get some answers here as I can not figure out why a Peterbilt 567 keeps breaking rear motor mount bolts. Truck is a 2019 Pete 567 Super tag, with a ISX12 with a 10spd Eaton ultrashift transmission. The driver side bolts have shears 3-4x and the passenger side bolts have shears once. All motor mounts have been OEM and 10.9 reverse hex head bolts.
     
    Austin264, Jul 22, 2024
    Austin264, Jul 22, 2024
    #1
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  3. Jul 22, 2024 #2
    AModelCat

    AModelCat Road Train Member

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    Do the new bolts just drop into place or do you have to pry on stuff to get them to line up?
     
    AModelCat, Jul 22, 2024
    AModelCat, Jul 22, 2024
    #2
    W923 and Lav-25 Thank this.
  4. Jul 22, 2024 #3
    Austin264

    Austin264 Bobtail Member

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    Jul 22, 2024
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    Everything has to be loosened in order to put the new bolts in as well as prying on stuff to get the bolts to go in as if the frames too narrow but once everything is in place everything is fine
     
    Austin264, Jul 22, 2024
    Austin264, Jul 22, 2024
    #3
    W923 Thanks this.
  5. Jul 22, 2024 #4
    AModelCat

    AModelCat Road Train Member

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    That's likely your issue. The bolts are probably shearing off due to misalignment of the holes.
     
    AModelCat, Jul 22, 2024
    AModelCat, Jul 22, 2024
    #4
    W923 Thanks this.
  7. Jul 23, 2024 #5
    W923

    W923 Road Train Member

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    How are the new bolt being tightened?
     
    W923, Jul 23, 2024
    W923, Jul 23, 2024
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    Oxbow Thanks this.
  8. Jul 23, 2024 #6
    Goodysnap

    Goodysnap Road Train Member

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    Goodysnap, Jul 23, 2024
    Goodysnap, Jul 23, 2024
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    Rideandrepair, wore out and W923 Thank this.
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