Taking the plunge. My journey as an O/O.

Discussion in 'Ask An Owner Operator' started by Farmerbob1, Jan 7, 2019.

  1. Farmerbob1

    Farmerbob1 Road Train Member

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    Well, first pass analysis and troubleshooting came up with this.

    The injectors which push DEF into the exhaust system are apparently okay, but there is something of a design flaw with the direction that the injectors push the DEF. Supposedly this doesn't impact all DD15 engine DEF systems, but it does impact a lot of them. Essentially I have a DEF crystal buildup around the injectors that is causing issues. There is an 'apron' assembly that can be placed next to the injector to help the DEF and exhaust mix properly and prevent DEF crystal buildup.

    I spoke to the home terminal shop, and they verified that this apron insert process was a common thing for 2016 Freightliners with dd15 engines. Not all trucks needed the DEF injector apron assembly, but a lot did. Mine never got one as a company truck.

    I am still not entirely convinced that this is going to address the problem I want fixed, but it will apparently fix at least one problem that may or may not be related. I have driven the same sorts of patterns and mileage in this truck for over 500k miles now, and this issue is new.

    So, they are doing the work, and then I'll take her out on the road and see what happens next 34.
     
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  3. runningman0661

    runningman0661 Road Train Member

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    Had the same problem, some dealerships call it an awning that helps disperse the DEF more evenly. There is a nationwide shortage of this part in the system, we did two forced regens, and then I went to DPF alternatives and had the filter baked and cleaned. Knock on wood it’s been running fine since.
     
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  4. loudtom

    loudtom Road Train Member

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    I would probably have the filters cleaned while it's taken apart unless it's been done recently. DPF alternatives did a good job with my DOC and DPF filters, it was like $250 I think and a 24 hour turnover. They ultrasonically clean it, bake it, blow it, and flow test it.
     
    Last edited: Apr 14, 2021
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  5. TallJoe

    TallJoe Road Train Member

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    This can be an endless process.
    How much would it cost to replace the whole aftertreatment system?
    I mean 100%, every filter, every sensor, every harness, every tank, every hose, every bolt and nut.
    Making it factory new like .
     
  6. Oscar the KW

    Oscar the KW No Filter

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    If you’re going to pay someone $15k plus I’d say.
     
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  7. Long FLD

    Long FLD Road Train Member

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    A new one-box is around $15k I’ve heard (no experience with DD15’s) so if you’re talking new def tank, all new sensors everywhere, new def lines, and labor at $150/hour or so.....I would bet you’d spend every bit if $25k for what you’re wanting to do.
     
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  8. Oscar the KW

    Oscar the KW No Filter

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    Last I heard a one box is $10k, maybe they have gone up with everything else.
     
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  9. Farmerbob1

    Farmerbob1 Road Train Member

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    I was told that the new One-Box I got under warrantee 230k miles ago would have cost me 12k. Not sure if that is the entire aftertreatment system though. It's at least most of it.
     
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  10. Farmerbob1

    Farmerbob1 Road Train Member

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    I plan on having the filters replaced next time I'm home. Trying to minimize time and expenses out on the road.
     
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  11. Itsbrokeagain

    Itsbrokeagain Light Load Member

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    How are your coolant temps through this whole process? I might have mentioned it on here before but my BMW X5 diesel was known for having a failing thermostat, which wouldn't get it up to operating temp, which then wouldn't allow regens and plug the DPF. Some owners reported issues with the DEF doser getting clogged up with crystals, washing it in warm water usually dissolved the mess. NoX sensors were notorious for failing across almost any diesel platform, Mercedes, BMW, Chevy, even my Freightliner M102 with a Cummins ISC in it. They are usually the main culprit for all these woes, and averaged $500 each. If you can get them from Detroit for $250 a pop, that's a steal and a half.
     
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