C-12 Jake question

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by circle h, Apr 14, 2024.

  1. circle h

    circle h Light Load Member

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    Oct 22, 2020
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    I have a 2004 mbl c-12 in a w900b daycab. It always idled a little rough so I finally pulled the jakes and copied all the injector trim codes and got them set. I adjusted the injectors and valves since I was there. It now idles smooth. When I put the jakes back on I found conflicting information on the lash setting. I have always run them at. 045 I found something that said mbl should be .055 . I set them at .055 and I don't have the engine braking that I used to. So my question is can I run the .045 setting? Or was that possibly part of my rough idle.
     
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    I do not know about those Jake settings but I do not thank that would affect idle. It would affect how your Jakes work when applied. Do not thank they are in play at idle.
     
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  4. circle h

    circle h Light Load Member

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    Oct 22, 2020
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    Thanks. All six trim codes were wrong. Runs much better now.
     
    BoxCarKidd Thanks this.
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