M-Class (W166) Produced 2012-2015

ML sounds like it has aluminum cans in the engine on startup

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Old 07-22-2022, 10:12 AM
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2015 SL550, 2017 GLS 550, 2010 G550, 1995 E320 Cabriolet
ML sounds like it has aluminum cans in the engine on startup

My 2015 ML has about 95,000 miles on it. Recently, when I start it up, there is a large hollow rattling sound in the engine for about 5-10 seconds before the engine returns to a normal sound. There are no error codes presently. Any idea what might be causing this?
Old 07-22-2022, 10:50 AM
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Originally Posted by JD101b
My 2015 ML has about 95,000 miles on it. Recently, when I start it up, there is a large hollow rattling sound in the engine for about 5-10 seconds before the engine returns to a normal sound. There are no error codes presently. Any idea what might be causing this?
Gasoline V6? Could be chain tensioners that are lacking check valves. Read about this on the site for affected engines.

Or could be normal direct injection sounds. Are you familiar with direct injection engines/cars?
Old 07-22-2022, 11:01 AM
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Originally Posted by chassis
Gasoline V6? Could be chain tensioners that are lacking check valves. Read about this on the site for affected engines.

Or could be normal direct injection sounds. Are you familiar with direct injection engines/cars?
I am. My concern is that this is a recent event. I've never heard these sounds before.
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Old 07-22-2022, 03:56 PM
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Originally Posted by JD101b
I am. My concern is that this is a recent event. I've never heard these sounds before.
Gasoline V6?


Read through the chain tensioner check valve threads to see if your engine is in the affected range and if the work has been done on your engine.

Old 07-22-2022, 04:03 PM
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2008 E350 (W211 @170K), 2012 ML350 (W166 @119K), 2014 E350 Sport (W212 @96K), 2015 ML350 (W166 @92K)
https://static.nhtsa.gov/odi/tsbs/20...70532-9999.pdf

and,

https://tuningpro.co/the-4-most-comm...gine-problems/

or if interested in how it is done


Last edited by juanmor40; 07-22-2022 at 04:06 PM.

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