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B Class B180 petrol W245. Everytime you accelerate, the engine/gearbox makes a rattle.

JacksonT

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Joined
Nov 5, 2022
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Location
UK
Car
Mercedes B
I have a B Class B180 petrol 2009 W245. Every time you accelerate, the engine/gearbox makes a rattle no matter if the engine is cold or warm. It's a CVT. Any idea what it could be?
 
It could be something as simple as a loose heat shield or a bearing / pulley / idler / tensioner on the alternator / a/c drive belt or a cam chain tensioner problem......impossible to diagnose remotely sorry.
You could post up a video of the noise but best option is to find a local mechanic to take a look.
 
It could be something as simple as a loose heat shield or a bearing / pulley / idler / tensioner on the alternator / a/c drive belt or a cam chain tensioner problem......impossible to diagnose remotely sorry.
You could post up a video of the noise but best option is to find a local mechanic to take a look.
Thank you. I'll post a audio file when I get the time. But you are right, best to take to a local mechanic.
 
Fwiw I would add to Smiley's list the possibility of it perhaps actually being the exhaust that is rattling.
 

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