Replacement front cover for Big Cam 1

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Apr 14, 2026.

  1. Apr 14, 2026 #1
    mile marker 27

    mile marker 27 Road Train Member

    1,419
    1,739
    Dec 4, 2019
    0
    Needing a replacement front cover for a Big Cam 1. Tried sifting through several used covers off cores but the last three have hairline cracks. This company offers a new one and the description says ‘94 and older N14 and NT855. I’m assuming this is compatible with what I’m needing but it’s not my money that’s being spent. I assumed N14, all the way back to the BC1 used the same front cover and the small cams were different. 2181884279714991069.jpeg 680712333207984314.jpeg
     
    mile marker 27, Apr 14, 2026
    mile marker 27, Apr 14, 2026
    #1
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Apr 17, 2026 at 2:01 PM #2
    Nss

    Nss Light Load Member

    130
    259
    Jul 5, 2021
    0
    N14 cover has a bigger bore for assy drive. Big cam assy drive in smaller diameter
     
    Nss, Apr 17, 2026 at 2:01 PM
    Nss, Apr 17, 2026 at 2:01 PM
    #2
    W923 and mile marker 27 Thank this.
  4. Apr 17, 2026 at 2:08 PM #3
    Nss

    Nss Light Load Member

    130
    259
    Jul 5, 2021
    0
    Is smaller diameter
     
    Nss, Apr 17, 2026 at 2:08 PM
    Nss, Apr 17, 2026 at 2:08 PM
    #3
  5. Apr 17, 2026 at 5:26 PM #4
    mile marker 27

    mile marker 27 Road Train Member

    1,419
    1,739
    Dec 4, 2019
    0
    So, is their discription false?
     
    mile marker 27, Apr 17, 2026 at 5:26 PM
    mile marker 27, Apr 17, 2026 at 5:26 PM
    #4
  7. Apr 17, 2026 at 9:10 PM #5
    BoxCarKidd

    BoxCarKidd Road Train Member

    4,555
    6,643
    Aug 26, 2014
    0
    I do not know 100% but I know this. The one in my picture assy drive leaked. There are two different seals for different shafts in the N14 and I had installed the wrong one.
     
    BoxCarKidd, Apr 17, 2026 at 9:10 PM
    BoxCarKidd, Apr 17, 2026 at 9:10 PM
    #5
  8. Apr 18, 2026 at 8:50 AM #6
    mile marker 27

    mile marker 27 Road Train Member

    1,419
    1,739
    Dec 4, 2019
    0
    I’ve got a seal that came with the in frame kit. Oddly enough, the kit came with the seal but not the “L” shaped plug to stop oil from leaking through the keyway, of the shaft.
    So it’s my understanding that the accessory drive shaft is a larger diameter for any and all N14’s vs NT444, Series IV, III, II and 1?
     
    mile marker 27, Apr 18, 2026 at 8:50 AM
    mile marker 27, Apr 18, 2026 at 8:50 AM
    #6
  9. Apr 18, 2026 at 9:01 PM #7
    BoxCarKidd

    BoxCarKidd Road Train Member

    4,555
    6,643
    Aug 26, 2014
    0
    Never say always and always say maybe. However I never saw anything without an L seal on a big cam. All ready told you there are two different ones for N14's. Cummins seals have a number on them. Do you have the old one?
     
    BoxCarKidd, Apr 18, 2026 at 9:01 PM
    BoxCarKidd, Apr 18, 2026 at 9:01 PM
    #7
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.