Has anyone torn into the timing components of a m276 (m278) engine yet? At 253,xxx miles I've changed the timing chain tensioners but just every now and then I get a heckuva rattle. It cranks and runs fine. I get the following codes:

The pos of exh cam bank 1 deviates from the specified valve. Implausible signal.

The pos of intake came bank 2 deviates from the specified value. Commanded position cannot be reached.

The first code is not there all the time but the second is. I just purchased a GL450 to have as a spare car (needed three rows to haul grandbabies). This will give me an opportunity to get the GLK in the shop and break it down to see what is up. It is now at 253k miles, uses no oil and has always had 7500 mile oil changes using Mobil 1 changed hot. Based on what I've read I'm thinking at least the intake on bank 2 cam adjuster needs to be replaced. Once you remove the covers you can see if the adjusters have issues while turning engine over by hand. I'll start there over the next few days.

I'm thinking with the type chain design they should be good for 300k miles. Any thoughts on that. There is a kit you can purchase off ebay that has all the timing components, new tensioners, chains, guides and all four cam adjusters. I have not decided if I'm going to go with something like that because I'm assuming it is made in China. The cam adjuster from MB is $1000/each
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Jim