MLBFC

I found this Bulletin in a MB UK Forum...I have no idea if MB should pay for the fix, or how to approach this. I do have this noise at start up on my 2013 ML 350, 60K -MLBFC

Basically they are very good engines although some had issues with rattling or noisy timing chains on start up. The issue is to do with oil not get to the chain quickly enough and was addressed by Mercedes in the attached bulletin that tells you everything that you need to know.


The engines affected are :

Engine 157:

1) From engine number 157 9xx 60 009368 up to engine number 157 9xx 60 017984 install check valves and chain
tensioners

2) From engine number 157 9xx 60 017985 up to engine number 157 9xx 60 022333 (December 2012) install check
valves (optimized tensioners installed in this production range)
08-12-2013 1:44 AM d7recast

Engine 2768:

1) Up to engine number 276 8xx 30 000790 install check valves and chain tensioners

2) From engine number 276 8xx 30 000791 up to engine number 276 8xx 30 001281 install check valves only
Engine 2769:
1) Up to engine number 276 9xx 30 365996 install check valves and chain tensioners
2) From engine number 276 9xx 30 365997 up to engine number 276 9xx 30 406603 (February 2013) install check
valves only (optimized tensioners installed in this production range)
Engine 278:
1) Up to engine number 278 9xx 30 073273 install check valves and chain tensioners
2) From engine number 278 9xx 30 073274 up to engine number 278 9xx 30 103675 (February 2013) install check
valves only (optimized tensioners installed in this production range)
Note:
When performing repairs and only the check valves are supposed to be installed, the tensioners must still be checked
according to WIS documentation. If optimized tensioner is found to be defective it must be replaced

JRHolt

MLBFC,

There is an old post about this: Making a weird noise on startup. Please help!

Normally Service Bulletins are not covered after the warranty expires but you can always just go talk to them about it and see what they say

Here is a YouTube video showing how it is done:
Here is .PDF file copy of the service bulletin itself:

MLBFC

Thanks for the PDF.Jack. ....One of those jobs I just don't to think about..but one that will have to be addressed if I'm going to get this engine to last 200K.....

MLBFC

Looks ez enough...What could go wrong? Right? I bet this is why the dealership has been sneaking in an oil additive with oil changes....( I do my own since then).

JRHolt

It actually looks really easy. All you would have to do is measure the existing holes to ensure you order the correct check valves. You could easily make a tool to press them in

peter2772000

My 2013 doesn't make any noise on start-up. Should I assume that the check valves aren't needed?