Replacing rotors on '85 300D
 

I plan to replace the rotors on my 85 300D. Since, I am in Mexico, I am having the rotors sent to a friend who is driving down next week. When replacing rotors are there other parts that should be replaced at the same time? While the wheels are disassembled, should i check other items such as hubs, bearings, etc.? Thanks for any advice!
dave

On a 123 you will have to remove the wheel bearings to get the rotors off. So it's not only a good time, but sort of required that you repack and adjust the wheel bearings.

thank you, Paul. that is just the kind of heads-up i was hoping for :)

You'll need a set of seals (1 each side) for the bearings as well, as they are one time use and will be destroyed when you remove them to get to the bearings. Also, if you have never packed bearings before look up a video on how to do it. Not hard, but if you've never seen it done you probably won't do it properly.

You will also need some cleaning solvent to clean the bearings before repacking them. Never use gasoline as it will leave a film on the bearings that will attract dirt/grime. If you cannot get any solvent a very good wipe down with a clean rag will work also.

Thank you everybody for your valuable advice!
Mush appreciated. :)

I would just go to a drug store and buy some isopropyl alcohol if I couldn't get solvent or brake cleaner....

Two sets of bearings for the fronts, as mentioned you must remove the outer bearings, but the inner ones only if you want.

A good idea, also as mentioned, this is where you need new seals.

better to stop by home depot/lowes or a walmart and get a container of acetone, use a metal can to wash the bearings in - acetone melts some plastics.

I changed front rotors on my 1985 10 years ago and don't recall having to remove the hub. Indeed, I checked the wheel bearings several years ago and know that was the first time because I noticed the "clamp nut" instead of the "cotter-pin castle nut" on my old Mopars.

Like many Euro cars, the rotor is secured to the front of the hub w/ a large Phillips-head screw. You might need penetrating oil and an impact screw-driver to free it. If you end up having to drill it out, I doubt that screw is needed and was just a factory aid. Most American factories used a thin push washer you can break off and toss. The wheel studs secure the rotor. A missing screw would very slightly affect wheel balance though.

nope...

the rotor is bolted to the hub from the inside... the hub has to come off.

the 201 and 124 were the first mb's with the rotor held on with a set screw.

I was in Home Depot to day and they had a section with Automotive Stuff and Brake and Cab. cleaner were on the shelf.

The first time I adjusted the Front Wheel Bearing play I did not use a Dial Indicator and ended up overheating the Grease after a short drive.

Since that time I have had the Front Hubs off several times and always used a Dial Indicator to adjust the play and have never had any negative issues.

http://www.peachparts.com/shopforum/diesel-discussion/236897-how-guide-replace-front-brake-pads-rotors-w123.html


http://www.peachparts.com/shopforum/diesel-discussion/214123-how-replace-front-rotor-w123.html



Charlie


sent from my pos computer

You will need a big hammer....... trust me.... almost ripped my arms off trying to get those old ones off mine.