Cummins 400 Jake brake

Discussion in 'Trucks [ Eighteen Wheelers ]' started by herbiemin, Oct 31, 2015.

  1. Oct 31, 2015 #1
    herbiemin

    herbiemin Light Load Member

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    How hard is it to add a jake brake to a mid 70s Cummins 400 big cam? And any ideas on approximate cost from a salvage yard? Looking at a 78 Peterbilt 359 with a 400 swapped in place of a 350, and it doesn't have a jake....
     
    herbiemin, Oct 31, 2015
    herbiemin, Oct 31, 2015
    #1
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  3. Oct 31, 2015 #2
    FinkPloyd

    FinkPloyd Light Load Member

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    Depends entirely on what your definition of hard is... It could be done in a day if the right person is working on it.
    Just make #### sure you have the right CPL number before you do go salvaging.

    I don't know if this is allowed but ATHS would be the best place to get info on that big cam, that site is full with nothing but guys and girls who live and breathe the old iron.

    If you do end up getting it post some pics, everybody loves a 359
     
    FinkPloyd, Oct 31, 2015
    FinkPloyd, Oct 31, 2015
    #2
  4. Oct 31, 2015 #3
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Or www.tecbrake.com. If you can get a used one you may still want a new wiring harness and switches. The tec set up will work with jake or cbrakes( Cummings version that came out in about 86).
     
    BoxCarKidd, Oct 31, 2015
    BoxCarKidd, Oct 31, 2015
    #3
  5. Oct 31, 2015 #4
    blairandgretchen

    blairandgretchen Road Train Member

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    @double yellow added a jake to his Detroit, I think - may havve a pointeer or two.
     
    blairandgretchen, Oct 31, 2015
    blairandgretchen, Oct 31, 2015
    #4
  7. Oct 31, 2015 #5
    OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    If you buy a used set make sure you get the rocker box bolts with it. Will be a micro switch on the fuel pump throttle shaft that you will need, and a micro switch on the clutch pedal as well. Used to be around 105.00 years ago for a Jake rebuid kit, have no clue what it would be now. Finding someone local that you can trust and can do the job is your best bet. Only takes a few 0.001 of incorrect adjustment and you have a recipe for a big problem. Good luck.
     
    OLDSKOOLERnWV, Oct 31, 2015
    OLDSKOOLERnWV, Oct 31, 2015
    #5
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