M-Class (W166) Produced 2012-2015

W166 Clunk in engine bay

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Old Feb 27, 2026 | 11:00 PM
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Lyndsay's Avatar
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W166 Clunk in engine bay

2013 ML350 Bluetec, auto, 230kklm, Bought from Auction last week (Qld, Australia).
Loud clunk from engine bay on hard acceleration (foot to the floor) from standstill.
No codes, great acceleration and no noise when foot is not fully 'shoved' to the floor.
Previous experience, on different brand cars, suggest the fault lies with engine mount failure.
No Diagnosis tool (yet).
Car looks well cared for otherwise.
Id rather procure additional parts that are likely to fail in the near future that could be replaced while I am dismantling sturrfff around the engine mounts.

Any suggestions on additional areas / parts to measure / look for?


Last edited by Lyndsay; Feb 27, 2026 at 11:02 PM.
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Old Feb 28, 2026 | 10:54 AM
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From: In the Shadow of the Tetons
2013 ML350 Bluetec
Fluids are the life blood of an automobile. If in doubt, change it out.
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Old Mar 16, 2026 | 01:22 PM
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2011 GL450
Preventive

Originally Posted by Lyndsay
2013 ML350 Bluetec, auto, 230kklm, Bought from Auction last week (Qld, Australia).
Loud clunk from engine bay on hard acceleration (foot to the floor) from standstill.
No codes, great acceleration and no noise when foot is not fully 'shoved' to the floor.
Previous experience, on different brand cars, suggest the fault lies with engine mount failure.
No Diagnosis tool (yet).
Car looks well cared for otherwise.
Id rather procure additional parts that are likely to fail in the near future that could be replaced while I am dismantling sturrfff around the engine mounts.

Any suggestions on additional areas / parts to measure / look for?
Higher mileage vehicles generally need the serpentine belt system (belt,pulleys and tensioner) replaced. I'm not sure, but I think you may have to remove the alternator to replace the right side mount(on left hand drive). It would also be a good time to replace the water pump and hoses, if they haven't been already.
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Old Mar 20, 2026 | 08:06 PM
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Thank you, Appreciated

Last edited by Lyndsay; Mar 20, 2026 at 08:08 PM. Reason: spelling error- (sticky keyboard)
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