Does my M7040 have a EGR engine? Pictures to help!

[MHarryE]

MHarryE - did you find threads here on TBN with damage related to removing the egr? Just curious as I would like to read them.

No, I found truck engine forums plus references in engine troubleshooting guides referencing the result and probable cause. I was somewhat surprised on engines showing this cause and effect in that I thought they would have software that would have put the engine into a "limp home" mode if something like this was detected. Also before retiring I was part of an engine development team and this was a failure mode of which we were aware and by knowing the problems resulting from various exhaust gas sensor outputs we de rated the engine in stages. By this I mean if a normal 175 HP engine reached exhaust temperatures outside safe parameters we limited fuel to 160 HP. If it still ran outside doe then we refueled it to a 145 HP engine and kept stepping down.

 

[kuboman]

I know dozens of truckers that have deleted the emissions on their engines with 0 problems, in fact the engines ran better and likely lasted longer than with emissions garbage on. The internet is full of misinformation.:2cents:

 

[wmonroe]

No, I found truck engine forums plus references in engine troubleshooting guides referencing the result and probable cause. I was somewhat surprised on engines showing this cause and effect in that I thought they would have software that would have put the engine into a "limp home" mode if something like this was detected. Also before retiring I was part of an engine development team and this was a failure mode of which we were aware and by knowing the problems resulting from various exhaust gas sensor outputs we de rated the engine in stages. By this I mean if a normal 175 HP engine reached exhaust temperatures outside safe parameters we limited fuel to 160 HP. If it still ran outside doe then we refueled it to a 145 HP engine and kept stepping down.

Thanks for the info.

 

[MHarryE]

Not saying it can't be done because I don't know every engine and application. What I can say is that in development I have seen the failures I described on engines and know the software solution to prevent it from happening.

 

[The Fred]

When an EGR is deleted combustion temps rise. The reason EGR was invented was to cool combustion temps and the formation of oxides of nitrogen, the fifth bad gas according to EPA.

Nitrogen Dioxide | Air & Radiation | US EPA

Fred

 

[jkornbread]

Im rather curious where everyone is coming up with combustion temps being higher with egr defeated. Diesels operate a little different than gasoline engines. It would make more sense that combustion temperature would drop. When a diesel is lacking oxygen, then exhaust temps rise. This is why in trucks its so common to upgrade to a bigger turbo to keep the temps in check. So by defeating the EGR and not introducing the oxygen deficient air into the intake of the head, it would seem that you would have more oxygen available for combustion, resulting in more power, better fuel economy, and a LOWER combustion temperature. Not that any of these would be huge differences on such a small motor.
Another thing is egr loves to gunk up and choke the intake tract over time............

 

[kuboman]

Im rather curious where everyone is coming up with combustion temps being higher with egr defeated. Diesels operate a little different than gasoline engines. It would make more sense that combustion temperature would drop. When a diesel is lacking oxygen, then exhaust temps rise. This is why in trucks its so common to upgrade to a bigger turbo to keep the temps in check. So by defeating the EGR and not introducing the oxygen deficient air into the intake of the head, it would seem that you would have more oxygen available for combustion, resulting in more power, better fuel economy, and a LOWER combustion temperature. Not that any of these would be huge differences on such a small motor.
Another thing is egr loves to gunk up and choke the intake tract over time............

As you introduce more oxygen the fuel burns hotter not cooler. As stated before reducing the oxygen with the egr lowers the exhaust temps but increases the soot hence the need for a dpf. A vicious circle all payed for by the consumer to satisfy an out of control government agency that has no accountability. Sorry for the rant.

 

[Dave M7040]

As another Canadian with a an 2012 M7040DTHSCC1 I too am of same position as kuboman i.e. when EGR is present cylinder temps are reduced to reduce the formation of oxides of Nitrogen.
Dave M7040

 

[m5040]

The external EGR system was added to an already existing engine family to comply with emission standards. How can there be a risk of engine damage if the pre-EGR engines didn't have them? The injection pump does not have a boost sensor, so it doesn't add move fuel as the boost rises (like on-road truck engines). That indicates the turbo just adds more air to burn for less smoke and the turbo boost causes the EGR to open and add exhaust to the mix to reduce NOX. Half the time the EGR is closed anyways.