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  #1  
Old 03-11-2019, 07:38 PM
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OM642 burning oil - anyone see issues with rings?

I've got a lady that has called inquiring about help on her 240k mile 08 E320 Bluetec. Seems the check engine light is staying on and car is in limp home mode. She has taken the car to the local MB dealer for service since new and says the body is in too good a condition to write the car off. Not sure exactly right now about oil usage but seems dealer is telling her it will take $2k to get into the engine and try to ascertain whether it is the turbo or oil control ring$. I would have thought it would have been easy enough to check the "looseness" of the turbo. Anyway, has anyone been seeing issues with excessive oil consumption on this engine caused by oil ring issues?

At 240k it is going to be hard to justify putting much money into the car and I suspect it can get quite pricey digging into one of these.

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Old 03-11-2019, 08:57 PM
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If you have a CEL and limp mode, you are getting a trouble code. What is the code? Do you have a Xentry/iCarSoft? If not even a $20 cheapie code reader should at least get you pointed into the right system.

These things store massive data in the computer so it should lead you right to the problem.

Check the simple stuff first. If the crankcase breather diaphragm is shot it will suck down oil. Also if the air filters are dirty it will do that too.

How about this for a hypothesis: the breather is shot, it’s leaking oil out the turbo inlet air seal because it’s old, which dripped down on the swirl flap motor, killing it and setting the limp mode. BTDT on my 08 ML 320 (which has the identical engine as the 08 E320 BT), see the oil cooler thread.
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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #3  
Old 03-11-2019, 09:51 PM
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I have a 2008 E320 with 251,000 miles. Not adding oil between 10,000 mile oil changes. Plugged air filters can cause oil consumption -- easy to replace if dirty.
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  #4  
Old 03-12-2019, 06:03 AM
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Thanks, the car is about 80 miles from the shop so I'm unable to hook the computer to it. I will try to get the lady to get it to the shop and go from there.
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Old 03-12-2019, 06:22 AM
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I mean, if the oil oil rings are shot, wouldn't the compression rings be shot as well?

Unless this is a known issue with that the oil rings wear prematurely, other two suggestions above are great.

I advocate for a compression test, and if there are funky numbers a leak down test
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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.
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  #6  
Old 03-12-2019, 09:42 AM
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I don’t believe I’ve ever heard of a ring issue on an om642. The most common reason these start inhaling oil is a failed centrifuge on the PCV. It’s an inexpensive part so worth replacing on trial.

Do we know why the dealer is indicting the rings? Or are they basically just telling her they aren’t that interested in this business?
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  #7  
Old 03-12-2019, 01:47 PM
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In talking with her further she indicated that she got the feeling they were just trying to get rid of her and her 244000 miles 08 E class diesel. I told her to get it to the shop and let me nose around a little before saying it needs a new engine. My experience with MB is if the engines have not been totally abused the bottom ends (meaning long block) seem to hold up well.
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  #8  
Old 03-12-2019, 04:11 PM
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That engine should last longer than a 603 imo imo 300k miles and far beyond, i am positive the engine is healthy.
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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.
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  #9  
Old 03-12-2019, 10:03 PM
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Agreed, the chance that this car needs a ring job, if it has been well taken care of, oil changes on time, with proper oil, at 248k are nil.

However the chances she has a worn out breather are huge. Unless she has a super conscientious dealer service advisor, chances are they are just servicing her “by the book” and doing the A, B, C services, which do not cover replacing the breather.

The official service schedule also calls for changing the air filters at 4 yr / 40k, which I think is too long. Really should be 2 yr / 20k.

This engine will not be denied its air at high power levels, and if the filters are clogged, it will go looking for its air through the crankcase breather. Dragging oil with it.

My strategy if I were presented with this car:
First hook up scanner/Xentry and pull codes
Then pull Y-pipe and see how much oil sitting at the turbo inlet
Then pull air filter boxes and see if filters are dirty
Finally make sure it’s not the oil cooler seals that are leaking
__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #10  
Old 03-16-2019, 08:09 PM
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Pretty much did what you said jay but I also took the PCV valve apart and viola - found diaphragm messed up. Will change it and see what comes up next. The turbo does seem to have a little play but I don't see where it is rubbing or anything like that. Hard to quantify amount of play by moving it with my fingers.

The dealer replaced the diesel particulate filter with a rebuilt unit in Nov and I am getting a current/stored code for filter plugged. I'm going to give her the old PCV valve to take with her to dealer to see if they will make it good. I'll keep y'all posted as things progress. Is it possible to restore a particulate filter to proper operation just by regeneration?

thanks
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  #11  
Old 03-16-2019, 09:55 PM
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The turbo rides on pressurized oil, so it will feel just ever so slightly wobbly at rest when you rotate it.

There is a Liqui Moly product that flushes out DPFs, Roll Guy did this a while back
DIY DPF (Diesel Particulate Filter) cleaning (2009 R class- OM642)

I suspect if you have a bad breather puck it polluted the DPF with too much burnt oil. Hopefully you can flush out the DPF and get it running right again.

Be sure you are using only Mobil 1 ESP oil in this engine.
__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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  #12  
Old 03-17-2019, 05:27 AM
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Join Date: Dec 2009
Location: Bedfordshire UK
Posts: 531
I replaced breather device on my om642 engined Jeep grand cherokee.
The inside was torn half way around, oil was dripping from turbo and breather rubber pipe fittings.
The new breather could hold vacuum if you blocked one end and sucked on the other.
Replaced fuel filter yesterday so turbo hose and breather had to be removed, all clean inside.
There is a ‘new design pipe’with the valve from Mercedes for stupid money.... you do not need it just buy the pcv block on its own and fit it and all will be ok.
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  #13  
Old 03-17-2019, 07:42 AM
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Murkeybenz could you provide the p/n for just the pcv valve? Wonder if the "new design" is supposed to resolve some of the issues with the system?

Upon doing more reading it seems that as the OM642 engine wears the blow by exceeds what the pcv system can handle. There are some threads out there where ppl have added an oil catch can between the pcv valve and the turbo inlet. My plans are to replace the pcv valve, clean the dpf and then see what we've got.

Maybe MB needs to bring back the oil separator that they used to run on the 240D. Y'all remember that small coffee can looking black canister?
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  #14  
Old 03-17-2019, 08:20 AM
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Location: Newport News, Virginia
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I knew those stealers where up to crooked work. "Hey, let's tear apart your engine for no good reason and charge you thousands to fix nothing!"

Is it incompetence or something more sinister?
__________________
1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.
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  #15  
Old 03-17-2019, 10:41 AM
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Join Date: Dec 2009
Location: Bedfordshire UK
Posts: 531
Part number in listing below
https://www.pelicanparts.com/More_Info/6420101891.htm?pn=642-010-18-91-M604

Here is same with the uprated pipe !!
https://www.pelicanparts.com/More_Info/6420101891.htm?pn=642-010-18-91-MBZ

I am in Uk so ordered mine from eu.spares.com in Germany at £27.

Once the diaphragm inside tears (similar to a zenith carburettor setup ) then valve just lets fumes and oil mist through constantly , some Jeep owners just run a hose under chassis to stop it or a catch can but a new unit solved mine and I will probably change it in around another 25k.
Most seem lifed for 20-25k

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