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  #1  
Old 01-12-2011, 03:36 PM
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Air Pump Bearing removal 92 400E

diagnosed a burned up bearing on air pump. I have it off the car and cleaned. How do I get the bearing out of the pulley? DO I need to use a bearing press?

What about the small indents on the back of the pulley that appear to hold the bearing in place?

I'd really like to replace the bearing vs. the whole clutch or whole pump considering the STUPID cost for a device that really doesn't do much for the car.

Advice is appreciated. I will add a picture of the pulley with the burned up bearing.

Jeff

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'87 300E
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'06 ML350
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Old 01-12-2011, 03:47 PM
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picture 1 of pulley and bearing

hope this picture attached shows the back side of the pulley well enough for you to see the 6 indentions that hold the bearing in..
Attached Thumbnails
Air Pump Bearing removal 92 400E-imag0115.jpg  
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'87 300E
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  #3  
Old 01-12-2011, 04:23 PM
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Jeff, I just did that job last month. Pretty easy job.
You can take a big socket and press the bearing out, or knock it out with a big hammer. The little stake marks will just fold in and don't present too much resistance. When you get ready to install the new bearing, work the stake marks a bit with a small hammer and dremel tool, just to smooth out the area so the new bearing will slip in.
Place the bearing in your freezer for a few minutes, and put the pulley in the oven at 250 degrees. Slop a little oil on the pulley surface, and the bearing will almost drop in. Work quickly and give it a fews solid taps, using a large socket again to contact the outer race, not the inner bearing race. When the temps equalize, the bearing seizes pretty tight in the pulley, so there appears to be little need for re-staking it in. However, I did it just to be sure. Slip the washer back in on top of the bearing, and bang around on the staked areas with a punch. You'll get enough bite to hold the washer in tight and stop the bearing from moving for sure.

DG
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Old 01-12-2011, 08:09 PM
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I just did this job a couple months back on my 300E. Take a Dremel tool and carefully grind off the stakes. Don't nick the bore while grinding otherwise you'll have a tough time pressing in the new bearing. The bore must be smooth. If you do nick it, dress it down with the Dremel so it is smooth again. Once the stakes are ground out, use a socket to knock out the old bearing.

As DG said, use a socket to press in the new one, pressing ONLY on the outer race of the new bearing. Do not press on the inner race - it will destroy the bearing. There is an exact fit el cheapo socket for this job. I got it at AutoZone and I mean it is an exact fit, like it was made for the job. It is a Great Neck el cheapo socket - I think the size is 2" or 2-1/16" or something like that - I will get it if you need it, but just take the bearing to AutoZone and find a socket that exactly matches the diameter of the outer race of the bearing.

Then place the bearing in the freezer and the pulley in the oven, again as DC said. Stick the bearing in the freezer the night before you do the job. I used red Loctite to set the bearing in place - that might have been overkill. It was a mess, trying to handle the cold bearing, hot pulley, and the Loctite all at the same time. Put the pulley in a vise while doing this or get a helper and the job is much easier. Good luck!
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  #5  
Old 06-15-2013, 07:37 PM
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I'm trying to remove the air pump clutch in the car (92 400e) and I'm not sure how to. The allen key goes in the centre and I've tried to fit a socket over the allen onto the hex nut shape to hold it, the clutch, while I turn the allen. Really hard to do but I'm not sure if I need to put force on the nut or the allen key. Which one am I trying to turn and in what direction? Is it left handed? I really hope I can get the clutch off without removing the whole pump. It sure looks like I should be able to.....but how? Help!! Thanks...... Oh, and does anyone have a part number for the replacement bearing? Thanks again.
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  #6  
Old 06-17-2013, 02:14 PM
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The Chinese sourced bearings are readily available on ebay for $70.

IIRC I held the allen and removed the nut with wrench but this was with the unit removed from the car.

I have an extra bearing that you can have for a lot less. I will check the size.

The bearing is marked C&S 320-2001 China. It is 52mm OD, 32mm ID, 18mm outer ring height, 20mm inner ring height.

Last edited by glenmore; 06-18-2013 at 12:27 AM.
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  #7  
Old 06-18-2013, 01:25 PM
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Quote:
Originally Posted by glenmore View Post
The Chinese sourced bearings are readily available on ebay for $70.

IIRC I held the allen and removed the nut with wrench but this was with the unit removed from the car.

I have an extra bearing that you can have for a lot less. I will check the size.

The bearing is marked C&S 320-2001 China. It is 52mm OD, 32mm ID, 18mm outer ring height, 20mm inner ring height.
I'll PM you.......

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