Crankshaft Bearing Clearance/Balance shaft/knock on startup on Mercedes-Benz ML350

Submitted by casey40510 · May 29, 2025
Published by RepairPal

Problem overview

When starting the engine after sitting for several hours, a knocking sound may be heard for several seconds. This is a common issue with the 2006-2010 Mercedes Benz ML350. There are three common problems that can cause this sound to occur:

-Oil pressure building too slowly, allowing for movement between the crankshaft and crankshaft bearings

-Stretch or wear of timing chain and components

-Balance shaft (counter rotating shaft) gear wear

The remediation for these problems can be crankshaft bearing replacement with correct size, replacement of timing components, or balance shaft replacement.

12 people reported this problem
2 comments
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Mercedes-Benz ML350 vehicles with this problem

Average mileage: 70,000 miles
(54,000 - 86,000)

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