Hi all,

My W211 engine makes tick tick sound once it's warmed up at idle. That noise comes from the bottom of the engine, I think.

In most cases, this tick tick noise comes from valve lifter at cold start, but my W211 doesn't make tick tick noise at cold start - only after the engine is warmed up like 85-degree C.

Please refer to the video clips of other owners in Youtube below;

Below is a W211 video shot in Youtube which has a same noise as mine. Please focus on the noise after 00:52 of this video. The ticking noise can be heard easier outside of the fender than inside of the engine room.

Below is another video shot in Youtube. Please hear the ticking sound 1:00 to 1:30 in this video.


Any idea to remove this noise?

Thank you in advance.