OM642 Oil change procedure
Thread Starter
Junior Member
Joined: Aug 2019
Posts: 38
Likes: 5
From: uk
Jeep 3.0crd
Never heard about such TSB for Mercedes.
I am pretty sure I don't know all the versions, but I do know that OM642 has dozens of models. Not only filters and piping come different on different vehicles, but I know the engine is tuned from 168 HP in Sprinter vans to 250 HP in newer sedans. That's pretty wide spread in tuning.
So I just wonder if for Jeep application they modify the engine (again) and side effect is weak bearing? What's HP rating in Jeep?
I am pretty sure I don't know all the versions, but I do know that OM642 has dozens of models. Not only filters and piping come different on different vehicles, but I know the engine is tuned from 168 HP in Sprinter vans to 250 HP in newer sedans. That's pretty wide spread in tuning.
So I just wonder if for Jeep application they modify the engine (again) and side effect is weak bearing? What's HP rating in Jeep?
It is a OM642.980 if that means anything?
It is 218bhp and 375ftlb torque.
I am not aware of any differences in the basic engine of the OM642 in different models. Odd indeed though that Jeep issued the TSB but Mercedes did not.
Many thanks.
Senior Member
Joined: Apr 2012
Posts: 356
Likes: 66
2012 ML350 Bluetec, 2015 GL350 Bluetec
There are several differences as far as I know. The 642.826 on my cars have water cooled turbo while older versions have oil cooled turbo. Also there's a plate installed under the oil filler port while older versions don't. The plate blocks the vision to the timing chain tensioner. 642.856 is tuned to 240hp in US and 255hp in Europe.
MBWorld Fanatic!
Joined: May 2015
Posts: 4,037
Likes: 1,011
From: Miami, FL
2003 CL 600
That TSB was back from 2008 and probably had to do with a difference in oil specs and bearing tolerances between Jeep and MB, that was when the engine was brand new to the company. I'm sure after 12 years they figured out a better option than replacing one bearing to prevent a noise.
Thread Starter
Junior Member
Joined: Aug 2019
Posts: 38
Likes: 5
From: uk
Jeep 3.0crd
That just means it's one variant of OM642. Both my 2012 ML350BT and 2015 GL350BT have 642.826 variant installed in them. There are many other variants available, for example a 642.856 variant in a W212 E350BT.
There are several differences as far as I know. The 642.826 on my cars have water cooled turbo while older versions have oil cooled turbo. Also there's a plate installed under the oil filler port while older versions don't. The plate blocks the vision to the timing chain tensioner. 642.856 is tuned to 240hp in US and 255hp in Europe.
There are several differences as far as I know. The 642.826 on my cars have water cooled turbo while older versions have oil cooled turbo. Also there's a plate installed under the oil filler port while older versions don't. The plate blocks the vision to the timing chain tensioner. 642.856 is tuned to 240hp in US and 255hp in Europe.
Yes indeed. My Jeep has an oil cooled turbo. Mine you can see the timing chain from the oil filler cap. Some jeep owners found out it can fire oil out with gay abandon if you fire it up without the cap on.
Thread Starter
Junior Member
Joined: Aug 2019
Posts: 38
Likes: 5
From: uk
Jeep 3.0crd
That TSB was back from 2008 and probably had to do with a difference in oil specs and bearing tolerances between Jeep and MB, that was when the engine was brand new to the company. I'm sure after 12 years they figured out a better option than replacing one bearing to prevent a noise.
Jeep had used the OM642 since 2005-2011 in Europe.Jeep had used that engine for three years by then. Incidentally from 2000-2005 jeep used the OM612.
Would Mercedes really have made the OM642 with different bearings just for a Jeep? I am not saying you are wrong it just seems counter intuitive to me.
As an aside they shipped the Engines as a unit with the 722.6 transmission (Jeep called it a W5J400) to American assembly line. European ones were made in Austria by Magna Steyr
Thanks.
MBWorld Fanatic!
Joined: May 2015
Posts: 4,037
Likes: 1,011
From: Miami, FL
2003 CL 600
Might be an issue with the oil at a Jeep dealership not being the right stuff for the MB bearings, as it says after a first service. Maybe when the original fill is drained and now a thinner oil is run and you have a knocking, the clearance of the first bearing was too loose and causing a drop in oil pressure somewhere else in the engine. Pure speculation for me, but I can't imagine it was a batch of bad bearings that only affected Jeeps and only one bearing out of all the crank mains.
Thread Starter
Junior Member
Joined: Aug 2019
Posts: 38
Likes: 5
From: uk
Jeep 3.0crd
Might be an issue with the oil at a Jeep dealership not being the right stuff for the MB bearings, as it says after a first service. Maybe when the original fill is drained and now a thinner oil is run and you have a knocking, the clearance of the first bearing was too loose and causing a drop in oil pressure somewhere else in the engine. Pure speculation for me, but I can't imagine it was a batch of bad bearings that only affected Jeeps and only one bearing out of all the crank mains.
The Oil that Jeep specified in the owners manual and at the dealer was MB229.51 5W/30.
MBWorld Fanatic!
Joined: May 2015
Posts: 4,037
Likes: 1,011
From: Miami, FL
2003 CL 600
Interesting, well if that's what is actually being put into the car, it's strange then why they had bearing issues. Also the diagnostic step of removing the belt and checking for the noise to stop is odd.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Thread Starter
Junior Member
Joined: Aug 2019
Posts: 38
Likes: 5
From: uk
Jeep 3.0crd
Maybe removing the belt takes tension off the bearing?
MB229.51 is a very easy spec oil to find in UK and the vast majority of Jeeps will be diesel.
I agree that it is all very strange. Mercedes owned Jeep back then so they will obviously have been aware of the bearing issues and it was happening enough to warrant a TSB. Go figure.
Thanks for taking time to help.
Last edited by Jeep driver; Jun 1, 2020 at 08:57 AM.
Newbie
Joined: Jan 2022
Posts: 1
Likes: 0
2007 GL 320 CDI
help maybe?
post deleted. found that I could send personal email to virgisr.
Last edited by AS4U; Jan 14, 2022 at 09:46 AM. Reason: didn't like
