We have seen some early M271 engines with broken chains, these are single row chains. In-line 4 engines have many merits when compared to engines with more cylinders, such as low cost, excellent gas mileage, low weight and compactness. I really want to get this motor repaired as I plan on keeping this car till the wheels fall off, and quite honestly, its embarrassing trying to explain a loud, consistent sitting for 30+ minutes hot engine knock to friends and family. It, like others have said, should be fixed without having to jump through hoops with your dealer like I did. The only thing it cannot be is moderately important. The engine pulls hard and sounds fantastic at speed after new spark plugs old ones were factory items at 157,000 miles I leave it be as the nature of the car, same with the new 3.
For those of you who are experiencing this, I highly recommend you press the issue and use the resources of this forum to get it fixed. Thanks for all the help and the explanation. This past summer it was so bad it retarded the timing and zapped the power. I had a vortec before, and never experienced this. You need a dependable shop that has the right know-how in order to fix the problem and make the necessary repairs. However, they might still try sleeping through.
Unfortunately they could not give me a time frame. These symptoms are concerning for Mercedes drivers, as well they should be. Let them know you mean business! Will let you know what happens. This problems can appear with the balance shaft gears affect up to 10% of Mercedes equipped with the M272 engine from 2004-2008. What would I tell the parts department to get the proper bearings I need? The customers didn't have to do anything other than bring the car in and complain about the noise! It's loaded with all the goodies ,but leather which I don't like anyway! That is what they are there for and believe me, the dealer doesn't want to hear from them. On an installed engine this centering can be subjective with limited room using a mirror particular on a V8.
Andy One thing I forgot to ask, if nothing is done, what is your opinion on the longevity of the motor? Just to update this scenario: The car is at the dealer. I have no fight left in me with this dealer for any type of warranty or even non warranty repairs. With this engine, for the first time, continuous variable valve timing was implemented, as well as electronic control of coolant flow replacing a mechanical thermostat. Kind of sounds like a loose rocker arm on the older small blocks. Balancing the movement of the components of the engine simultaneously requires a balance shaft gear to offset the disproportionate weight of the motion that is specifically created when your vehicle accelerates to higher speeds. This vibration can be canceled by applying a 2nd order balance shaft.
It is quite an expensive fix that , so make sure you cover your bases before you invest in one of these affected models. My mechanic, that does most of the water pumpers in town, uses the 180 degree twist method and I have never heard of any failures and he does a lot of belts, including race cars. Unfortunately, the gear itself is not a replaceable item. Balance shaft gear problems are most typical among V6 piston engines, primarily the Mercedes M272 in models manufactured between the years 2004-2008. Furthermore, the manufacturer may only cover a portion or percentage of the costs. Who thought up that one? This is not a fix you can do yourself.
You will get there attention. I've driven it twice on long trips pulling a small utilty trailer and average 18 mpg. After some time the lifters all quieted down and now after 2 weeks the noise is back. Apparently that was quite common on those. For the sake of argument, say I had no warranty and was going to do this job myself, say over the winter. Once we had the answer it was simply a matter of contacting the owners of the problem cars yes, we keep track of stuff like that and scheduling appointments to make the repairs. Maybe your dealer has a short memory? I am soon getting my truck inspected, so I will have the dealer check it out.
Our warranty is 3 year 36,000 miles nationwide. I like the comfort of the interior. Let us know how you make out. We are close enough to Weaverville, and Asheville, to make it worth the drive. The main bearings are the cause of the noise. Now down to my issue.
Please or to join the conversation. So if any of you believe that, you'll need to bring your trucks in every 10000 miles for it's quarterly cleaning. I am concerned obviously for when the warranty is up and question the longevity of this engine. If this issue is not fixed, it can lead to costly engine damage if the timing chain jumps. M, doesn't have a fix and won't authorize attempting to repair it! Check engine light just came on and from what I have found it can go from simply replacing the camshaft sensor to replacing the balance shaft, and I'm kinda freaking out.
There was even a class action lawsuit filed against the car company, which claimed that Mercedes-Benz was making the engines on these models with defective gears, according to of Law360. Any help would be greatly appreciated! Other people have told me the noise is coming from the front balance shaft bearing. While these issues are common, they are certainly frustrating for Mercedes drivers who expect quality and reliability from such luxury performance vehicles. If your Mercedes have over 50k you should check it at every oil change. Once the engine is apart they can see which bearings were fitted from the factory. Their lack of communication is appalling, as is their service dept.