Injector Solenoid Loose???

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Scrapper, Mar 10, 2012.

  1. Scrapper

    Scrapper Light Load Member

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    Jan 19, 2010
    Nashville, AR
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    KW T600 CAT NXS Accert.

    Posted this already for information but found something odd. This is the truck with the questionable #6 injector. Took valve cover off wallago to check wiring and ohm out harness. Was about the loosen the nut off the top and the solenoid spun. Well this was odd. Had an old E model injector laying around so I put it in the vice to get the solenoid off...its very tight. Got it off and it has an oring inside of it. Never seen the inside of one.

    Well I figure it was sucking air from around that causing the questionable injector. Do not have a height gauge right now so got it as tight as we could without taking it out. Hooked it back up and it seems better...

    Hooked up to ET right now letting the engine warm up. Going to do another cutout test and see if it got any better. She seems to be idling better. Crossing my fingers.

    Has anyone EVER seen this?? What would cause it to back off and loosen like that? I have never seen it. How tight are the solenoids supposed to be? Can you replace just the oring under the solenoid and retighten and be okay? Seems like would be the logical thing for us to do. Just odd. Hope someone else has seen this. Only thing I can figure is when it was rebuilt the previous mech did it by mistake. Owner said the truck has always idled like this. Don't know if they ever did a cutout test on it.

    Any ideas?? Fixing to do cutout right now...kinda good deal to have wireless in the shop. Can post and test at the same time. lol.
     
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  3. Volvo92906

    Volvo92906 Light Load Member

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    Jan 14, 2011
    Ohio
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    Can I have the serial number and arrangement on the engine? I might be able to get you a spec on the torque for it.
     
    Scrapper Thanks this.
  4. Scrapper

    Scrapper Light Load Member

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    Jan 19, 2010
    Nashville, AR
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    NXS11194

    Its all stock.

    Thanks alot. Running test right now.
     
  5. Volvo92906

    Volvo92906 Light Load Member

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    Doesnt look like the solenoid itself is serviceable. No spec on it and no part numbers for it.
     
  6. Scrapper

    Scrapper Light Load Member

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    Jan 19, 2010
    Nashville, AR
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    They all passed this time.

    Other five are not working nearly as hard now.

    #1 2.07
    #2 2.09
    #3 2.09
    #4 2.05
    #5 2.09
    #6 2.05

    Looks way better...still just tightened the solenoid with a crescent. Thats all we could get in there to it. Can't take it out until we get a height tool. CAT didn't have one today.

    Will probably get a new oring for the solenoid and retighten it...think we found our culprit...totally a suprise though.
     
  7. Scrapper

    Scrapper Light Load Member

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    Jan 19, 2010
    Nashville, AR
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    Well the solenoid will come out all together. One large orange oring on it. The old E model I took apart was really tight. I guess we'll just have to pull it and get it as tight as we can....it has large course threads on it. I'm sure it was sucking air around it. Thanks again. Maybe someone thats had these injectors apart will chime in. I wish I could find FarCall...I know he had done alot of injector work.

    Was alot cheaper than that 500 dollar injector!! lol.

    Thanks again Volvo for trying...will get some pics soon and post what I'm talking about.
     
    EverLuc Thanks this.
  8. Volvo92906

    Volvo92906 Light Load Member

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    Yeah, id like to see. Glad you seem to be figuring it out.

    Sorry I couldnt do more.
     
  9. underpsi

    underpsi Road Train Member

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    Toronto, Ont
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    Did the side of the injector have evidence of fuel running down or leaking? The solenoid must have been loose when the injector was installed if the wiring was still connected.
     
  10. Scrapper

    Scrapper Light Load Member

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    Jan 19, 2010
    Nashville, AR
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    No evidence of fuel leakage, never found any or smelt any in oil or under valve cover.

    Seems to run much better now, company bought the truck new and it has never idled quite right. We'll see monday if the driver notices the differnce. Should be much easier pull. He is close to 80,000 so it will be a good test. All the injectors passed test but if you look at the numbers they still are not withing specs. I think spec calls for them to be within .02 of one another.

    I also adjusted the wastegate a little. It was pinched off...I cut the zip ties...wanted to check it today. Was awfully tight, didn't seem like the low psi turbo kicked in early enough. Loosened it some...maybe a turn and half and the low psi turbo now kicks in about 1400 seems like...you can feel and hear it when it kicks in. Before seemed it didn't really get everything till 1800 or so. I was bobtail so we'll see what happens next week. Going to do fuel temp mod on it soon. Want to get it all right before I started tinkering with it.

    Wanted to get Haney on the ECM's but if fuel does what its supposed to do we may not get to....its a double edged sword...he could get us more milage...but gotta be making the money to get it done. Hard to do with 4-5 dollar diesel. :biggrin_2557:
     
  11. Mr. Haney

    Mr. Haney Road Train Member

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    Dec 17, 2008
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    Take the injector out and tighten the solenoid and actuator housing to the body of the injector. You don't have to be critical about injector height as you're installing the same injector back in the same cylinder and everything will most likely still be within specs afterwards.

    There are aftermarket companies that you can purchase a new O-ring if you need to. CAT will not sell you the internal O-rings for an injector that I know of.

    The reason you were getting a questionable injector with the cut out test is, the actuator wasn't responding correctly to the magnetic field of the solenoid correctly. With the housing being lose, vibration, along with the air gap where hindering the actuator from closing the spill port and holding it shut tightly, it also was effecting how it modulates after injection pressure rises.
     
    EverLuc and Scrapper Thank this.
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