Cummins isx timing

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Electromechanic, Apr 16, 2021.

  1. Electromechanic

    Electromechanic Bobtail Member

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    How do I know my timing is correct ?
     
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  3. AModelCat

    AModelCat Road Train Member

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    Canuckistan
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    Why do you figure its wrong?
     
  4. Goodysnap

    Goodysnap Road Train Member

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    The ECM knows its in time. If not it throws a fault code.

    The CM 870 and 871 are a tad more detailed than the newer commonrail engines due to the fact that they can be dialed in by valve and injection timing. But for the most part if its not within a cerain window it will do the same.
     
    Last edited: Apr 16, 2021
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  5. Electromechanic

    Electromechanic Bobtail Member

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  6. Electromechanic

    Electromechanic Bobtail Member

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    When I insert the wedges into both cams and set timing and then rotate to A mark which valves should be adjusted first ?
     
  7. Electromechanic

    Electromechanic Bobtail Member

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    Because after I removed my wedges and rotated to mark A which cylinder must be adjusted first ?
     
  8. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    "A" will be cylinder #1 or #6. "B" will be #2 or #5 "C" will be #3 or #4. To know if you are #1 or #6 when on "A" look at the injector rocker. Whichever just started it's downstroke is the correct cylinder. The intake and exhaust valves should also be completely closed. After determining that, follow firing order 1,5,3,6,2,4
     
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  9. Electromechanic

    Electromechanic Bobtail Member

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    I am confused whether I am at tdc 1 or 6 when I am inserting my wedges
     
  10. Snailexpress

    Snailexpress Road Train Member

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    I don't understand what you trying to do. Did you use crank pin and wedges to set timing?
    Go to cummins quickserve.com for manuals.
     
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  11. Goodysnap

    Goodysnap Road Train Member

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    You do not set valve lash with the engine pinned and wedged, you set the front gear train lash first. Then Bar to "A" and start with 1 or 6 whichever valves are closed. Follow the order as @QUALITYTRUCK said.
     
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