Question about Mercedes-Benz 420-Series

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Need to replace front wheel bearings on a mercedes 420 sel 1991. Are they pressed on?

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Procedure for front wheel bearings replacement and related jobs
Remove wheel hub from steering knuckle:
1. Remove wheel.
2. Remove brake assembly, and hang it on suspension spring with wire. (wire brush the caliper outer covering, rag cleaning the surface with pre-all solution; let it dry, brush on a thin coat of rust encapsulator if required).
3. Remove brake disk;
4. Clean the caliper bolt holes threads in the hub using an old bolt with a slot cut in its threads.
5. Clean the removed bolts, apply Thread Locker Blue to end section so they can be reused.
6. Remove contact spring for radio interference suppression.
7. Slacken the clamping screw with a 5mm hexagon socket.
8. Unscrew the hub nut with adjustable wrench;
9. Remove the thrust washer.
10. Pull the hub assembly away from the steering knuckle.

Remove old outer races and insert new ones:
1. Remove the bearings from hub.
2. Remove the outer races of both inner and outer bearings.( you will need a drift and hammer to remove )
3. Clean the hub thoroughly, clean center mating surface with brake cleaner.
4. Pre-cool the races in freezer, and pre-heat the hub body up to 400?°F for easy installation.
5. Insert new outer races of both inner and outer bearings.
6. Clean the center hole thoroughly after both outer races are in place.
7. Pack the bearings with high-temp grease thoroughly and insert into the races.
8. Add the sealer ring to the inner bearing.hope this is what you needed and yes they are pressed in but are relatively easy to knock out..be sure to knock them back evenly into the hub...hope this helps

Posted on Sep 07, 2010

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