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250 Cummins Jakes

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 64Peterbilt, Jun 4, 2018.

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  1. Jun 4, 2018 #1
    64Peterbilt

    64Peterbilt Bobtail Member

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    Jun 3, 2018
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    I recently bought a Peterbilt 351 as a project and it has an old NH 250 Cummins in it. I am debating wether to fix up and keep this motor in it or repower it with a newer NTC 350 or 400. One of the things i want is jakes and my truck does not currently have them. I know that the 250 is an 855 ci same as the NTC but i dont know about the heads and stuff if they are different. I know there are many benefits to upgrading to the NTC but i am not sure on all the technical pros and cons to that swap.
     
    64Peterbilt, Jun 4, 2018
    64Peterbilt, Jun 4, 2018
    #1
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  3. Jun 5, 2018 #2
    Bean Jr.

    Bean Jr. Road Train Member

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    Mar 30, 2014
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    The 250 isn't the NH series, it's the NC series, which is the same as a 335, 350, etc. There are some difference in a 290 and big cams, but essential a 335 is a 250 with a turbo and a small cam is a 335 with an after cooler, hence NTA , turbo aftercooled.
     
    Bean Jr., Jun 5, 2018
    Bean Jr., Jun 5, 2018
    #2
  4. Jun 5, 2018 #3
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Jakes no problem but a standard 250 does not have piston cooling nozzles. Not advisable to but a hair dryer on one.
     
    BoxCarKidd, Jun 5, 2018
    BoxCarKidd, Jun 5, 2018
    #3
  5. Jun 5, 2018 #4
    slickWillie1980

    slickWillie1980 Medium Load Member

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    Mt Olive, NC
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    Pics or it don't exist!!!!
     
    slickWillie1980, Jun 5, 2018
    slickWillie1980, Jun 5, 2018
    #4
    BoxCarKidd and Bean Jr. Thank this.
  7. Jun 5, 2018 #5
    kranky1

    kranky1 Road Train Member

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    Ontario, Canada
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    If its an 855 it is an NT. NH were 743
     
    kranky1, Jun 5, 2018
    kranky1, Jun 5, 2018
    #5
    BoxCarKidd and Bean Jr. Thank this.
  8. Jun 5, 2018 #6
    DougA

    DougA Road Train Member

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    Retired,In my shop in Md.
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    NH-195,NH-220, 5 1/8 bore,743 cid.,no factory turbo charging. NHC-250 5 1/2 bore,855 cid.,N.A., was standard equipment in a lot of trucks,back in the day. Back then Cummins also made a Super 250,927 cid,never caught on,only ever saw a couple,crank issues.
    Also NTC-335 did not have an aftercooler.
     
    DougA, Jun 5, 2018
    DougA, Jun 5, 2018
    #6
    Bean Jr. Thanks this.
  9. Jun 5, 2018 #7
    SmokinCAT

    SmokinCAT Road Train Member

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    That botched attempt at the 927 scarred Cummins for life, not once after that would they ever try to go to a longer stroke in the 855.
     
    SmokinCAT, Jun 5, 2018
    SmokinCAT, Jun 5, 2018
    #7
  10. Jun 6, 2018 #8
    64Peterbilt

    64Peterbilt Bobtail Member

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    Jun 3, 2018
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    20180606_084150.jpg 20180606_084138.jpg 20180606_084132.jpg
     
    64Peterbilt, Jun 6, 2018
    64Peterbilt, Jun 6, 2018
    #8
    slickWillie1980 Thanks this.
  11. Jun 6, 2018 #9
    64Peterbilt

    64Peterbilt Bobtail Member

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    Jun 3, 2018
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    Well everything ive found researching it says its an 855. I found the manual online and it says 855 as well so im not sure.
     
    64Peterbilt, Jun 6, 2018
    64Peterbilt, Jun 6, 2018
    #9
  12. Jun 6, 2018 #10
    slickWillie1980

    slickWillie1980 Medium Load Member

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    Mt Olive, NC
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    slickWillie1980, Jun 6, 2018
    slickWillie1980, Jun 6, 2018
    #10
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