Doing a rack job on dd13 engine.

Discussion in 'Freightliner Forum' started by All out Trucking, Jan 25, 2022.

  1. All out Trucking

    All out Trucking Bobtail Member

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    Jan 25, 2022
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    I have 2013 cascadia dd13 with 714,000 miles. What does that mean, the effect on the engine, consist of and how often should this be done.
     
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  3. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    It means adjusting the valve lash to manufacturer specs. If you don't know when it was last done, do it. Should be good till 1 million.
     
  4. Bean Jr.

    Bean Jr. Road Train Member

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    Running the rack is a misnomer. 2 cycle Jimmies controlled the throttle with a rack gear, ala rack and pinion steering. As setting that was part of doing the overhead on them, they calledit "Running the rack" to differentiate from tuning a Cummins.
     
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  5. AModelCat

    AModelCat Road Train Member

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    As mentioned above, no rack on anything on-road built in the last 20-25 years.
     
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  6. msh

    msh Light Load Member

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    DD says first valve lash adjustment must be done after 100k, then after 500k miles. I do adjustments every 250k miles...
     
  7. Dino soar

    Dino soar Road Train Member

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    I see you guys talking about rack jobs and DD I thought you were talking about something like this:

    Eo6lrsHUwAcyLVa.jpg

    e95b79856a87652d7adb89d9cef1809f.jpg
     
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  8. MAMservices

    MAMservices Light Load Member

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    Bean Jr. Thanks this.
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