Anyone ever cleaned out the EGR/intake pipe?

Discussion in 'Engine' started by TeddyRuxpin, Jan 16, 2020 at 4:38 PM.

  1. TeddyRuxpin

    TeddyRuxpin Hardcore MB Enthusiast

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    Hi,

    I've removed/cleaned the EGR valve from my OM642 engine (W212 231BHP). Wasn't badly coked up, no massive amounts of build up (like in the pipe/intake pics below), just a stubborn layer of carbon over everything. I replaced the gasket and the rubber seal and put it back. No problems.

    However, I/my OCD wants me to clean the EGR pipe at the front of the engine (might be called the 'EGR admission hose'), and possibly the entire throttle body pipe/intake.

    Has anyone done this? I can only find one thread about it online, and it's more OM642 for the w211 specific, I think things are a bit different on a W212.

    Included some pics pinched from another forum showing the area, and the gasket.

    Doesn't look to be too difficult, just need to make sure that I have all the correct gaskets before starting the job.

    Anyway, just wondering if anyone here has done this job, has any pictures, or advice etc. I'm also going to be replacing the green and black o-rings at either end of the turbo inlet pipe and the camshaft sensor too, so I'm gonna make a day of it.

    Cheers!

    Ed
     
  2. Larkone

    Larkone Hardcore MB Enthusiast

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    Or you could just get it deleted from the ECU - best result for the OCD as it never bothers you again.
     
  3. neilrr

    neilrr MB Club Veteran

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    Isn't that illegal & an MOT fail? Greta will be taking you off her Xmas card list too.
     
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  4. OP
    OP
    TeddyRuxpin

    TeddyRuxpin Hardcore MB Enthusiast

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    I've thought about it as I'll likely be remapping the car soon and you can get an EGR software removal, but I'd like to keep the EGR in place.

    These cleaning jobs seem relatively easy so I have no problem cleaning these components once every couple of years.

    I wouldn't be surprised if NOx levels are tested as part of the MOT in the next couple of years anyway:

    Yes, it is illegal to remove any emissions related gear that came with the car when manufactured - but in the case of an EGR software based removal, it's hard to detect as the car will still (currently) pass an MOT based on the simple tests on the only thing that's tested on diesels is a 'smoke emissions test', where the only thing measured is the density of the smoke: Vehicle test procedures | nidirect

    As of 2018 it is a fail if the EGR is visually missing or modified (same for DPF obviously), but a software delete means all the parts are in place, so basically impossible to detect.

    This may change in the future, and I'd rather clean some parts every now and again and spare the world of some NOx and soot.

    Potentially you're putting more soot into the DPF, too.

    Anyway, anyone done this job EGR pipe cleaning job?!?! :)
     
    Last edited: Jan 16, 2020 at 6:47 PM
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  5. OP
    OP
    TeddyRuxpin

    TeddyRuxpin Hardcore MB Enthusiast

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  6. bob6600

    bob6600 MB Club Veteran

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    Friend of mine has the same car and engine. On the weekend he decided to change the turbo seal as it was leaking residue. He stumbled across a video for the PCV valve and changed this too. Car drives much better in his opinion
     
  7. OP
    OP
    TeddyRuxpin

    TeddyRuxpin Hardcore MB Enthusiast

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    Already changed the PCV and turbo seal (actually changed the turbo seal a few times), cheers! I've made my way around most of the engine replacing as many seals as possible, as long as they're easily accessibly by a muppet such as myself, and I don't end up making new problems! :)
     
    Last edited: Jan 16, 2020 at 6:49 PM
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  8. ullwn

    ullwn New Member

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    Ed,

    FWIW I cleaned mine on a R320 CDI.

    I used GUNK degreaser{ GUNK Engine Cleaner & Degreaser with Trigger Spray ] and a heated ultrasonic cleaner for the tube. The EGR valve, GUNK degreaser and a small nylon bristle brush a{a car detailing brush] I did not use a metal bristle brush as it would scratch the aluminum surface of the EGR. Also took off the black plastic cover {carefully as the plastic break very easily] to clean the plunger cam mechanism. Also change the O ring seal on the EGR valve.
     
  9. OP
    OP
    TeddyRuxpin

    TeddyRuxpin Hardcore MB Enthusiast

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    Hi mate,

    I cleaned the EGR already, thanks - I used carb/EGR cleaner and I changed the seal and gasket. I am talking mainly about the pipe and throttle body in the front of the engine. Check out the pics.

    However I didn’t take the plastic off the EGR valve itself. I didn’t want to break the plastic and didn’t know what was under there. Do you think it’s important to do?

    Attached pics of my EGR after cleaning.
     

    Attached Files:

  10. amazighman

    amazighman Hardcore MB Enthusiast

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    Hi.
    You see them little tabs at the bottom of the black cap? Pry em gently and cap comes off, you ll see the actuator arm .
    My problem was inside that black cap, there was so much crap in there that the actuator arm has no space to move even though the EGR bottom was just a bit dirty
    Cleaned that ,put a little drop of oil on the shaft and the actuator and it was moving free . So far so good
     
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  11. OP
    OP
    TeddyRuxpin

    TeddyRuxpin Hardcore MB Enthusiast

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    Thanks!

    I did see them and wondered if it should come off, but I am not sure I am brave enough to do that. I know what these things are like - on my old BMW E39 (albeit a much older car), anytime you touched any plastic, it would break. Especially tabs like these!

    Just trying to figure out if it's worth the risk!

    So is what I've done essentially pointless, as I didn't clean the actuator/arm?
     

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