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  #1  
Old 09-27-2021, 08:53 PM
jay_bob's Avatar
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Location: Columbia, SC
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OM642 Oil Leaks

My son’s 2008 E320 was consuming oil at the rate of about a quart every 1500 miles. Bottom was wet and the tail pipe dry (not oily, just a very light soot) so it was a likely a leak. 235 k miles and counting.

Things I did, it finally took doing all of these to get it to stay dry. It’s been dry for the last month and probably 1000 miles and level hasn’t moved off of full.

Oil filter tower - replaced both the tower to head and the mid of the neck gasket. There’s a Dorman kit that has both gaskets.

Crankcase breather puck. If the diaphragm is torn it sucks oil down the turbo.

The adapter on the back of the right bank cam the breather plugs into. The seal gets old and lets oil blow by into the breather.

And finally the oil cap! The easiest fix of all!

I did replace the turbo about a year ago, not sure how much that played into it. But since I wasn’t burning it I am not sure.

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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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  #2  
Old 09-28-2021, 02:32 PM
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Join Date: Jul 2021
Location: Texas
Posts: 55
Good work! Thanks to all your help and others on the forum I now have my 235k OM642 dry as well. I had a leaking oil filter housing, fuel filter, and a split charge pipe that was seeping oil as well.

I also replaced the PCV as mine was still the old design. I never had an oil burn issue but I am curious to see how stable the oil level is over the next several thousand miles.
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  #3  
Old 10-18-2021, 11:13 AM
jay_bob's Avatar
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Join Date: Oct 2011
Location: Columbia, SC
Posts: 3,941
Son came home this weekend, he’s probably gone at least 1500 miles since last time, he’s still just shy of full.

Good to see that other thread about chain stretch, looking forward to many more miles for this car for him. High 230s and hanging tough.
__________________
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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  #4  
Old 10-18-2021, 12:31 PM
87tdwagen's Avatar
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Join Date: Aug 2005
Location: Sunny Ft. Lauderdale
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Good observations, I have noted the same list and have not found new ones. FWIW the crankcase puck and supporting cam brace behind it leaks are exacerbated by the turbo suction on the PCV breather hose connected to the puck. Changing the seals buys you some time, but the engine is always trying to suck oil through these connections, and so leakage there will be an ongoing issue, let alone the known problem of that oil drawn into the intake just before the turbo and leaking onto the variable intake flap motor thus frying it. Best solution thus far has been plumbing in a oil catch can and venting it to atmosphere and plugging the port to the intake tube.

Some may not like the venting approach, but with suitable filter media in the catch can, very little oil vapors (visible at least) are vented. Any oil should be captured in the can, and your cam seal and breather puck will last significantly longer not having to deal with the turbo suction. You can also get fancy and plumb the oil catch can outlet to your exhaust so the vapors exit via the exhaust system. Up to you, but this approach works well and solves several issues with this engine. Also worth noting, the OM642 has significantly more blowby than prior MB OM engines. Not sure as to why, but they do. I capture 4x the amount of oil in my OM642 with half the miles on it even without the intake suction side connected, than I do on my OM603 with more than twice the mileage and still has the oil catch can connected to the turbo suction side.
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  #5  
Old 10-18-2021, 12:33 PM
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Location: Soperton, Ga. USA
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Sounds like a good idea.

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