Pre emission vs Emission engines

Discussion in 'Ask An Owner Operator' started by KullenTrucking, Apr 4, 2021.

  1. roundhouse

    roundhouse Road Train Member

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    What kind of Maint does the emission system require beyond def fluid ?
    I’ve never owned one , have no clue.

    we do have a bobcat that demands a regen twice a day when you really need it to move some dirt and the #### thing just stops working until you do a regen.
    The new bobcat is a total POS, the old bobcat is much more reliable , it never stops in the middle of a busy job site requiring a half dozen workers to stand around for a half hour waiting on the #### thing to regen.
     
    Last edited: Apr 8, 2021
    ChevyCam Thanks this.
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  3. roundhouse

    roundhouse Road Train Member

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    Good ideas ,

    Most people just never realize how bad some emission trucks can be for the owner . I never thought about it.
     
  4. AModelCat

    AModelCat Road Train Member

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    The emission system is really several parts:

    EGR on the engine. This helps regulate NOx by lowering combustion temperatures in the cylinder. There are sensor that coke up/fail, venturi pipes that can get blocked, coolers that fail etc.

    DOC and DPF. These are downstream of the turbo. The DOC and DPF work together to reduce particulates. The DOC gets "dosed" with fuel in order to generate the temperatures the DPF needs to properly regen. These have temperature and pressure sensors that can become damaged or plugged up. Every so many hours the DPF needs to be removed for cleaning out the ash. The DOC catalyst breaks down over time too.

    The SCR is the catalyst that further reduces NOx. DEF is constantly sprayed into the exhaust stream and it reacts with the exhaust gases and the catalyst. There's a DEF injector that can fail, NOx sensors that can fail etc. The catalyst itself can become face-plugged from a damaged DEF injector. Even the DEF pump usually has a filter that requires replacement at specific intervals.

    Don't forget there's an engine ahead of these catalysts. If its not healthy the aftertreatment system can hide it pretty well. Burning oil and coolant can plug up the catalysts, as can over-fuelling.
     
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