Acert injector removal procedures

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Katz, Feb 10, 2011.

  1. Katz

    Katz Medium Load Member

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    Jun 21, 2009
    Commiephonya
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    A little help, please. I need to remove injectors from my MXS Acert. Could someone tell me proper procedures on how to take them off?

    I do OK turning wrenches. Just never worked on big diesels before. Thank you!

    EDIT: Some of my specific questions include...
    - Do I need to time the cam/crank to a specific location before I unbolt the rocker assembly?
    - How are the injectors retained in the head? I don't really see any retaining bolt/clip (maybe hidden under the rocker?)
    - Torque specs on bolts/studs, and tightening sequence (if there's any) on the rocker assembly.
     
    Last edited: Feb 10, 2011
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  3. Katz

    Katz Medium Load Member

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    Jun 21, 2009
    Commiephonya
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    Well, never mind. A friend's friend who works at a local Pete dealer gave me some pointers, and I got all injectors out without any problem.

    I had a bad O-ring on #1 injector. Hopefully that was the cause of the problem, but I'm getting all injectors tested at a local injector shop.
     
  4. Mr. Haney

    Mr. Haney Road Train Member

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    Dec 17, 2008
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    They're easy to remove........but you've found that out. Now when you reinstall them use the old bolts to seat them and then remove them and install new bolts and torque to 30Ft-Lbs. The reason foir this is if you use the old bolts there is a very good possibility they can stretch later and the injector can become loss in the head.

    The local injector shop.........Signal Diesel? If you let them rebuild these injectors..........you're going to have problems. The injector needs to have it's own trim file.........not trim number input into the ECM for the engine to run properly. Make sure you install the injector in the same cylinder.........if they rebuild them........they will not match flow
     
    Katz Thanks this.
  5. Katz

    Katz Medium Load Member

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    Jun 21, 2009
    Commiephonya
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    Hey Mr. Haney, I didn't see your reply. I appreciate it.

    I wish I saw your comment about injector hold-down bolts. I'll replace them when I go home the next time.

    The local injector shop I mentioned is a part of E.M. Tharp Peterbilt dealership. They have a dedicated shop to do fuel system, though I'm not sure if they actually rebuild injectors. All I had them done was test and clean since I wasn't sure what the problem was. And I reinstalled each injector back into the cylinder it came from.

    The broken O-ring (at #1 injector) was the culprit. I'm guessing the fuel was unable to get to the rest of injectors, as it appears fuel goes into the injector rail from the front side.

    It's a little embarrassing to tell this, but I was experimenting with different fuel pressure relief springs (to get rid of a shim and reduce pressure fluctuation) and went a little too far. I put the stock CAT spring and a shim back in.
     
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