This writeup is to fix the supercharger pulley bearing.
If you hear god awful noises coming from the supercharger pulley which sound like grininding your bearing is going out.(dont confuse this with the supercharger squeak).
Replacing the bearing will probably not fix the supercharger squeak, but for some reason when i replaced the bearing on mine the squeak stopped. but this is only day 1.

Last week the bearing inside my supercharger pulley went bad making all kinds of noises. I have a 2003 sl55, but this writeup applies to all amg 55 compressor engines. I called up the dealership here in houston and as just for the bearing itself. Dealership said i have to purchase the whole supercharger pulley assembly they do not sell the bearing. I politely hung up the phone. If you open your hood and take off the engine cover you can clearly see the bearing held by a lock ring inside th supercharger pulley.
I am fortunate to have access to the oem bearing that mercedes uses on these pulleys. they are made by nachi. You may be able to order them at bearing supply shops cost any where from $50 to $75 for the bearing. I can get them for $65 but it take about a week for them to come in.


Tools needed
1. Torch
2. strap wrench
3. 15/16 socket and breaker bar
4. bench vise
5. 26mm socket (i think thats the size)
6. rubber mallet
7. keep old bearing you will need it to install the new on.


Step one
Open hood lol

Step two
pull off engine cover

step 3
Remove outer drive belt

step 4

Fire up the torch and heat the supercharger pulley bolt.
The bolt has loctite the heat will melt the loctite to make bolt removal easier.
be very careful with the torch in the engine bay area. target just the bolt heat for 30-45 secs. Keep fire exsingusher on standby just in case.

step 5

use strap wrench and 15/16 socket to undo supercharger pulley bolt.
remember righty tighty lefty lucy.

step 6
remove supercharger pulley

step 7
Remove the snap ring with some pliers at the from of the pulley.

Step 8
place pulley between bench vise, (grooves facing down, backplate facing your face)
vise does not have to be tightened to much just enought to hold in place for the beating you about to give it. MAKE SURE PULLEY IS RESTING ON THE SHINY SILVER PART NOT THE DARK METAL PART AS THE DARK METAL PART HOLDS TENSION)

step 9

place 26mm socket inside pulley and hammer out the bearing with a mallet.

step 10
clean the inside of the pulley

step 11
rub inside with a light film of grease

step 12
place new bearing inside then put a towel on top then put old bearing on top of that and hammer in the new bearing half way. take the old bearing off, then continue hammering in with the towel on top till the bearing is seated.

step 13
put snap ring back in

step 14
install pulley back into supercharger

step 15
put loctite on supercharger bolt thread then bolt on.
40lb torq or 60 nm

step16
put cover on the close hood.

step 17
go grab a drink and a snack
wait 30min for loctite to set

step 18

crank the benz up
mission accomplished

takes only 30 min at most