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W246 diesel b class 180d 2016 engine noise

darenGR

New Member
Joined
Apr 15, 2025
Messages
1
Location
Welwyn garden city
Car
B180d
Hello,

I have this intermittent noise from the engine (like tap, tap, tap) during revving down in neutral (ie raise rpm to 1500, then foot off gas).
I heard it a few days ago very loudly (helicopter noise like), and again yesterday.
I have attached the audio recording, with noise repeated 3 times (@seconds 1, 5, and 9)
Engine has 80000 miles and runs perfectly otherwise, no engine lamps on.

Any ideas please, would be highly appreciated.
regards,
Dimitri
 

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