Mercedes V6 Balance Shaft Repair

I am going to branch out on this blog to include things I encounter running the service desk. Hopefully you will find the information interesting.

From 2005 up through around 2007 all the Mercedes V6 engines could be effected by the teeth on the balance shaft wearing out. Symptoms can be as mild as a check engine light or as severe as the one here that is very very lucky it did not need an engine.

Here is a video of the car running when it came in.
So, first you evacuate the a/c and remove the engine and transmission.


Once removed, dismount the transmission, strip accessories, and remove the timing cover.

Here is a video I took of another MB balance shaft to demonstrate the failure (I forgot to take a video of this one while we had it apart).

Once that’s done, you put it all back together, and run through two oil changes, and in theory that’s the end of it.


Here is a video of the car running once the repair was done 

Some will cry foul for Mercedes, and maybe that’s warranted, but this is just another example of long term faults showing up as a vehicle ages. Mercedes did originally have a fairly generous extended warranty on this, but at this point probably all effected are outside of warranty. It’s a big job that takes close to 30 hours to perform, but Prolix Auto, aka L&B Auto, has done this repair many times, bring the car to me and my highly skilled staff can save you over 50% over dealer prices!

One thought on “Mercedes V6 Balance Shaft Repair

  1. Balance shafts are most commonly utilized in inline four-cylinder engines, Due to its design asymmetry, It have an inherent second order vibration. This vibration is generated because the movement of the connecting rods in an even-firing four-cylinder inline engine however it is not symmetrical throughout the crankshaft rotation; thus during a given period of crankshaft rotation, the descending and ascending pistons are not always completely opposed in their acceleration. However if you want to solve your crankcase problem please visit .


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s