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The wheel bearings on these vehicles are not adjustable. If the bearings become loose or make noise, they must be replaced.
Removal & Installation
Before servicing the vehicle, refer to the Precautions section.
On 4WD vehicles, remove wheel center cap, if equipped, and the drive axle nut and washer
Raise and support the vehicle.
Remove or disconnect the following:
Lay the hub and bearing on the wheel studs on the outboard side. This will avoid damaging the bearing seal.
Tire and wheelCaliper, leaving the fluid lines connectedBrake rotorHalfshaft from the hub and bearing on 4WD vehicles. Place a brass drift against the outer edge of the halfshaft to protect the shaft threads. Use a hammer to sharply strike the brass drift, but to do not remove the halfshaft at this time.Wheel speed sensorWheel hub and bearing-to-steering knuckle bolts and hub and bearing
Splash shield from the steering knuckleSeal from the hub and bearing
Install or connect the following:
Wheel hub and bearing sealSplash shield to the steering knuckle, making sure it-s properly alignedHub and bearing to the steering knuckle, aligning the threaded holesHub and bearing bolts and tighten to 77 ft. lbs. (105 Nm)Wheel speed sensor. Tighten the bolt to 13 ft. lbs. (18 Nm).Rotor and brake caliperTire and wheel
The Hub Bearing Torque - Front
If Torque Specs are not in the box we recommend youtorque to this setting. Axle Nut: 103 Ft/Lbs.Flange Bolts: 77 Ft/Lbs. WARNING: Failure to observe the following warningscould create a risk of death or serious injury.Proper maintenance and handling practices arecritical.Always follow installation instructions and maintainproper lubrication.Every reasonable effort has been made to ensure theaccuracy of the information contained in thiswriting, but no liability is accepted for errors,omissions or for any other reason.This information is not intended to substitute forthe specific recommendations of your vehiclemanufacturer.Always use the recommended torque requirement unlessotherwise specified in the carton.Depending on the application, type of hub unitbearing and location, the installation process mayvary.Please review the vehicle manufacturer'srecommendation before removing or installingcomponents.
Lower the vehicle
On 4WD vehicles, install the drive axle nut and tighten to 103 ft. lbs. (140 Nm), then install the center cap.
When setting the rear axle nut, tightening it with a good impact gun is very sufficient. The approximate torque is going to be around 250 ft lbs to gain adequate torque so it doesn't destroy the hub. Great little cars! Enjoy and if you need anything else, my father and grandfather were Porsche/Audi master techs and I have some experience with these so I can get some info quite easily! After tightening the nut, turn the wheel and make sure you do not have heavy drag from the bearing. Any drag should be from the normal action of the differential.
You sure can! Having worked on Volvo's, BMW's, and Audi's as an independent, I feel your pain!
3.6 hours at 125 dollars per hour dealer time and shop fees equals 600 dollars.
If the inner and outer bearing race is packed properly (with recommended grease), and torqued to specification with a torque wrench, there is no reason that you cannot perform this simple repair on your own!
Be sure to buy the bearing race(s) from Mercedes (do not skimp!), and have access to the factory manual from Stuttgart.
If you go to the Mercedes .de site, you will be able to get technical dealer assistance should you need more information. They will also provide you with a wholesale distribution outlet stateside so you can buy your parts at a 15 percent discount to that offered by the dealer.
You will need several tools to replace the bearing besides a socket set of metric and standard sizes to remove the wheel and brake caliper.
A 36mm socket (may be rented at some auto parts stores)
An Impact Wrench for the 36mm socket (air or electric should work)
A torque wrench (IMPORTANT!)- the 3 rear bearing bolts (12mm?) need to be torqued properly or else they will fail and cause the wheel to separate, i believe they need to be at 75 ft/lbs. Please check.
Do not attempt to do this yourself unless you have the proper tools and know how to use them. I recommend getting at least the Haynes manual that the stores have or buying the Dealers Service Manual (expensive but thorough and usually available on ebay!)