A journey into the the infamous Om642 oil cooler leak! - Page 12 - PeachParts Mercedes-Benz Forum

Miatanerd · #**166** 11-14-2018, 01:15 AM

I have successfully finished my oil cooler leak job. I want to thank you for posting pictures and sharing your experience. I am getting whistle sound when I drive the car. The noise get's louder when the RPM increases, it's hard troubleshoot since it's happens at 3k rpm higher. I think it's vacuum or turbo leak. Can you please help me? Car runs great after the job. I am getting following error code: p0098, p0472

I can remove the hood and let a friend sit on the engine and drive it around my local street. (j/k).

I am getting extremely frustrated with this car, I have spend so much money and time getting it put back together. All the carbon cleaning was no fun

Info about my car:
2008 GL 320
134k miles

jay_bob · #**167** 11-14-2018, 09:55 PM

Sounds like a leaking seal somewhere past the turbo outlet, down the silver charge air pipe, into the EGR mixing chamber, to the intake manifolds. Did you replace all the o-rings and gaskets when reinstalling the mixing chamber?

If it was me I would pull the charge air pipe and mixing chamber and look for a bad seal or something not put together correctly.

Rollguy had this problem, go back to the posts in the 11x range on page 8...He forgot to reinsert a sensor in the mixing chamber.

Don't get discouraged, it should be easy to find.

There is no vacuum to speak of on this engine other than the feed to the brake booster. Everything else is electrically actuated that would have been vacuum actuated in days gone by in the OM 61x/60x engines. So I'm pretty sure you don't have a vacuum leak, if you did, you would have hard brakes.

ROLLGUY · #**168** 11-15-2018, 10:34 AM

Quote:

Originally Posted by jay_bob

Sounds like a leaking seal somewhere past the turbo outlet, down the silver charge air pipe, into the EGR mixing chamber, to the intake manifolds. Did you replace all the o-rings and gaskets when reinstalling the mixing chamber?

If it was me I would pull the charge air pipe and mixing chamber and look for a bad seal or something not put together correctly.

Rollguy had this problem, go back to the posts in the 11x range on page 8...He forgot to reinsert a sensor in the mixing chamber.

Don't get discouraged, it should be easy to find.

There is no vacuum to speak of on this engine other than the feed to the brake booster. Everything else is electrically actuated that would have been vacuum actuated in days gone by in the OM 61x/60x engines. So I'm pretty sure you don't have a vacuum leak, if you did, you would have hard brakes.

jay_bob- your memory is better than mine, I had forgotten about that. Yes I remember having the same problem as Miatanerd- "I am getting whistle sound when I drive the car. The noise get's louder when the RPM increases, it's hard troubleshoot since it's happens at 3k rpm higher. I think it's vacuum or turbo leak. Can you please help me? Car runs great after the job. I am getting following error code: p0098, p0472"
The sensor was left out, and it caused a whistling sound. Snapping it back in the hole, and clearing the codes fixed it!

Miatanerd · #**169** 11-19-2018, 08:45 PM

I replaced the large green seals that go on the intercooler pipes. My air sensor was unplugged so I plugged it. All of the error codes went away. I still have the whistle noise, not sure where else to look. Any help you guys can offer will be appreciated.

jay_bob · #**170** 11-20-2018, 06:25 PM

Double check all your fittings, you have an air leak somewhere.

It could be on the supply side too, make sure you have the bellows between the air filter boxes and the Y-tube to the turbo inlet seated correctly. If you have the bellows folded over on the bottom I can see where it could suck air in there and make a whistle.

Blandt · #**171** 12-06-2018, 08:06 AM

Hi all, thank you for the well documented write up.
I have finally finished this painful job. My issue is that I didn’t document the wiring routes, and now I have a sensor that for the life of me I can’t remember where it goes.
Part # A0011531532
Googling that part comes up with “ tumble flap switch “ ....
Anyone familiar with this engine point me to where this sensor hooks up? (Picture attached)
Thank you all, and have a nice day.

mjeepwh · #**172** 02-21-2019, 09:42 AM

Hello guys,
I am new around here and I need some help if possible...
I am about to change the termoflot gaskets (Jeep Grand Cherokee WH) and while working on it, I found this whole that is unkown to me, it's function especially.

Can you please tell me what is all about?

https://imgur.com/a/nymlSnO

Thank you in advance

ROLLGUY · #**173** 02-21-2019, 02:37 PM

Quote:

Originally Posted by mjeepwh

Hello guys,
I am new around here and I need some help if possible...
I am about to change the termoflot gaskets (Jeep Grand Cherokee WH) and while working on it, I found this whole that is unkown to me, it's function especially.

Can you please tell me what is all about?

https://imgur.com/a/nymlSnO

Thank you in advance

That appears to be the drain hole for the oil when the cooler seals leak. It allows the oil to be seen dripping underneath. If you have it apart that far, I would replace the oil cooler seals and the screws.

jay_bob · #**174** 02-21-2019, 02:41 PM

Yep you’re almost to the halfway point! Remove the 10 screws and pull up the cooler.

Replace the orange seals with the new purple ones, put it all back together, enjoy your leak free Benz.

ROLLGUY · #**175** 02-21-2019, 03:30 PM

Quote:

Originally Posted by jay_bob

.......... enjoy your leak free Benz.

He means Jeep Cherokee

jay_bob · #**176** 02-21-2019, 03:56 PM

Ok, errr, his Jeep with a Benz engine...was over in Europe a couple years back, and someone I was visiting had a Chrysler 300c with OM642. One of the legacies of the Daimler-Chrysler days. Alas the 300c diesel never made it to the US.

ROLLGUY · #**177** 02-21-2019, 05:43 PM

Quote:

Originally Posted by jay_bob

Ok, errr, his Jeep with a Benz engine...was over in Europe a couple years back, and someone I was visiting had a Chrysler 300c with OM642. One of the legacies of the Daimler-Chrysler days. Alas the 300c diesel never made it to the US.

That's interesting, I wonder if any Chrysler parts (other than the OM642) cross over to MB models? (E class?).

engatwork · #**178** 02-21-2019, 06:50 PM

I'm not that familiar with the trannies but I'd suspect some of the them are interchangeable. I know the Crossfire uses a MB transmission.

Murkybenz · #**179** 02-22-2019, 04:11 AM

Quote:

Originally Posted by Blandt

Hi all, thank you for the well documented write up.
I have finally finished this painful job. My issue is that I didn’t document the wiring routes, and now I have a sensor that for the life of me I can’t remember where it goes.
Part # A0011531532
Googling that part comes up with “ tumble flap switch “ ....
Anyone familiar with this engine point me to where this sensor hooks up? (Picture attached)
Thank you all, and have a nice day.

Comes up as a camshaft position sensor when I google it .

https://www.ebay.co.uk/itm/MERCEDES-BENZ-M-CLASS-W164-Camshaft-Position-Sensor-A0011531532-New-/264047343531

https://mbworld.org/forums/m-class-w164/622352-w164-om642-diesel-camshaft-cmk-position-sensor-replacement-diy.html

mjeepwh · #**180** 02-25-2019, 11:33 AM

Quote:

Originally Posted by jay_bob

Yep you’re almost to the halfway point! Remove the 10 screws and pull up the cooler.

Replace the orange seals with the new purple ones, put it all back together, enjoy your leak free Benz.

Hello again,
Thank you all for the reply.
I've managed to change the orange seals, put all back on and the problems started to appear:

1.First, the car started after more than 10 minutes of cranking
2. After the engine started eventually, I changed the oil and fuel filter. Again, the engine didn't start
3. I had the rail cleaned and the engine started again
4. After 30 minute or so , I started again the engine and it stays way below 600rpm and whan tried to throttle up, the engine went dead.
5. At this moment I cannot start the engine

I connected the interface and I have these errors:
P0471 Exhaust pressure sensor A circuit range/performance
P0473 Exhaust pressure sensor A circuit high

What could it be?

Thank you in advance

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