2020 Mercedes Benz Truck ML 350 Technical Service Bulletin # LI33-25_P-0514013 Date: 130409
Wheels/Tires - Hard Metallic Knock from Front Wheel Bearing Are
Hard, metallic knock from area of wheel bearing on front axle when cornering slowly or while parking
Topic number L133.25-P-051401
Version 1
Design group 33.25 Axle housing, stub axle
Date 04-09-2013
Validity Model 164 as of VIN 164 ###.#A 557 500
Model 251 as of VIN 251 ### #A104835
Reason for change
Complaint:
When negotiating a gentle corner at walking pace (5-8 km/h) or while parking / maneuvering, a single, loud metallic knock is heard from the area of
the wheel bearing on the front axle.
Cause:
Wheel bearing bore in steering knuckle may not have sufficient press fit, therefore insufficient overlap between wheel bearing outer race and steering
knuckle.
Micro-movements result in the relevant noises.
Remedy:
Replace steering knuckle with wheel bearing.
In the case of follow-up repairs (steering knuckle already replaced), only replace the wheel bearing and secure it using "Loctite 648"
Note:
Use the Chassis Ear to facilitate diagnosis.
Experience has shown that in many cases the noise is caused only by the steering knuckle on the left-hand side in the direction of travel.
For this reason repair the left-hand side first.
To date we are only aware of problems occurring on vehicles produced from October 2009 onwards.
2020 Mercedes Benz Truck ML 350 4MATIC (164.186) V6-3.5L (272.967) Page 348
