S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

Engine knocking noise please help

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Old Dec 8, 2021 | 08:35 PM
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Dozzer's Avatar
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2005 S430
Engine knocking noise please help

Engine knocking noise please help any suggestions would be highly appreciated please and thank you on a cold start up the noise is barley audible but one car is warm this is what happens
https://youtube.com/shorts/PSs92ebqJh8


Last edited by Dozzer; Dec 8, 2021 at 09:46 PM.
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Old Dec 9, 2021 | 02:10 AM
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Mercedes
There’s nothing to fix . It’s an internal engine knock .

Drive it till it needs a new engine . You aren’t going to spend $8000 to open up the engine and rebuilt it , it’s way cheaper to buy a good used engine and have someone swap it in
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Old Dec 9, 2021 | 06:51 PM
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001 s600, 94 sl600
Angry engine knock(s)

Originally Posted by Dozzer
Engine knocking noise please help any suggestions would be highly appreciated please and thank you on a cold start up the noise is barley audible but one car is warm this is what happens
https://youtube.com/shorts/PSs92ebqJh8
There are two different (but related? sounds. First is a valve train maladjustment a loose tappet, possibly from worn thrust piece. The second is much deeper and more difficult (and costly) to repair.
It is something with a piston--either hitting combustion deposits or connecting rod bearing.
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Old Feb 8, 2022 | 03:43 PM
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S430
You just might have an exhaust leak somewhere. Even a minor leak will cause engine ticks and knocks to escape. The bigger leak the more it sounds like a tractor.
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