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Weak PACBRAKE on 1995 12.7 S60

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by blairandgretchen, Dec 23, 2022.

Page 2 of 3
  1. Dec 24, 2022 #11
    blairandgretchen

    blairandgretchen Road Train Member

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    South west Missouri
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    They have a good site - I'll do some reading.

    The CEL issues were with the Jacobs set - and noticeably worse the colder ambient temperatures became. Jacobs are off - PAC is back on. No codes, everything working as it should, just awful weak.

    Did you pull the P63 off the VIN or the engine serial?
     
    blairandgretchen, Dec 24, 2022
    blairandgretchen, Dec 24, 2022
    #11
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  3. Dec 24, 2022 #12
    blairandgretchen

    blairandgretchen Road Train Member

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    South west Missouri
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    Yes - my mechanic. It's close to Christmas and both his shop heaters went down, and a hot water leak at his house, so I'm not pressuring him , but he'll have to look back and start searching where the rebuild kit came from.

    Mechanics dad mentioned a while back that engine brakes were a dealer installed option many years ago - @pushbroom picked off the P63 , so I guess they were Detroit factory installed.
     
    blairandgretchen, Dec 24, 2022
    blairandgretchen, Dec 24, 2022
    #12
    singlescrewshaker Thanks this.
  4. Dec 24, 2022 #13
    blairandgretchen

    blairandgretchen Road Train Member

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    South west Missouri
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    Why did you replace? Unless the Jacobs set that went on were faulty, the PAC performed a lot better.

    Unfortunately I'm not at an apples to apples comparison, or have much of a datum point to reference at this stage. Frustrating.
     
    blairandgretchen, Dec 24, 2022
    blairandgretchen, Dec 24, 2022
    #13
    IH9300SBA and singlescrewshaker Thank this.
  5. Dec 24, 2022 #14
    pushbroom

    pushbroom Road Train Member

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    chrome_XiHzxhHLDa.jpg
     
    pushbroom, Dec 24, 2022
    pushbroom, Dec 24, 2022
    #14
    jamespmack, IH9300SBA, singlescrewshaker and 1 other person Thank this.
  7. Dec 24, 2022 #15
    little cat 500

    little cat 500 Road Train Member

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    pac brake was not near as strong as a jake
     
    little cat 500, Dec 24, 2022
    little cat 500, Dec 24, 2022
    #15
    blairandgretchen Thanks this.
  8. Dec 25, 2022 #16
    blairandgretchen

    blairandgretchen Road Train Member

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    Dec 9, 2011
    South west Missouri
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    blairandgretchen, Dec 25, 2022
    blairandgretchen, Dec 25, 2022
    #16
    IH9300SBA, pushbroom and singlescrewshaker Thank this.
  9. Dec 25, 2022 #17
    IH9300SBA

    IH9300SBA Road Train Member

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    What head work was done? Being unable to achieve proper lash makes me think you have bigger issues going on with the valvetrain and it's showing up in engine brake performance.
     
    IH9300SBA, Dec 25, 2022
    IH9300SBA, Dec 25, 2022
    #17
    blairandgretchen Thanks this.
  10. Dec 26, 2022 #18
    OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    Good morning my friend, in all honesty I’m not familiar with this style of Jakes. I’m thinking @jamespmack runs a DD and may have some knowledge of them….?
     
    OLDSKOOLERnWV, Dec 26, 2022
    OLDSKOOLERnWV, Dec 26, 2022
    #18
    blairandgretchen and jamespmack Thank this.
  11. Dec 26, 2022 #19
    jamespmack

    jamespmack Road Train Member

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    I have zero on a pac brake. The Jacobson yes. Normally as long as the solenoids and harness are good, they are pretty trouble free. Mine physically put you back in the seat.

    There are a few models, wrong model could possibly cause issues.

    Any CEL is wiring/solenoid or ecm related.


    This is a wild hunch. I dont really know the answer. But Paccar esp KW like to use ground side to control stuff, even on ecm side of a Detroit. Any chance jake solenoids are Normally open on one, and Normally close on the other? Thoughts from my couch.
     
    Last edited: Dec 26, 2022
    jamespmack, Dec 26, 2022
    jamespmack, Dec 26, 2022
    #19
    blairandgretchen and IH9300SBA Thank this.
  12. Dec 27, 2022 #20
    blairandgretchen

    blairandgretchen Road Train Member

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    Dec 9, 2011
    South west Missouri
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    I think it was leaking oil from the head gasket, when he removed head we found one scored liner, so replaced that cylinder pack. I don't think head was resurfaced, but I'll ask.

    Morning sir!

    The CEL was throwing when we had the Jacobs on - with the PAC on there is no codes. I'll ask him about the ground control issue.
    Kinda difficult for me to figure it out because I'm not the one that worked on them - I appreciate the input from you guys that have fooled with this stuff a lot longer.
     
    blairandgretchen, Dec 27, 2022
    blairandgretchen, Dec 27, 2022
    #20
    IH9300SBA and OLDSKOOLERnWV Thank this.
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