Results 1 to 6 of 6

Thread: Air Pump Pulley Bearing and Filter Replacement

  1. #1
    Senior Member
    Join Date
    Dec 2014
    Location
    Norcal
    Posts
    138

    Air Pump Pulley Bearing and Filter Replacement

    I'm in the process of changing the pulley bearing on my '95 E420 air pump. Anyone done this lately and available to offer any tips?

    I'm planning to grind away the small, displaced metal tabs at the back of the pulley, press the bearing out and replace it.

    Also, I discovered that the box on the back of the pump contains a filter! I had no idea. I cannot find a part number for this filter. Anyone know it?
    Last edited by luckymike; 09-07-2017 at 11:27 PM. Reason: typo

  2. #2
    .036 Hoonigan™
    E500E Boffin
    gsxr's Avatar
    Join Date
    Dec 2008
    Location
    Boise, ID, USA
    Posts
    18,880

    Re: Air Pump Pulley Bearing and Filter Replacement

    I don't think the filter is available separately.

    I thought there was a thread here already for the bearing, but I can't find it... here's my notes on the topic:

    Smog pump bearing, MB # 001-981-42-27
    INA # L32/52 2RS AH03


    As of Nov-2014:

    INA currently has no stock on this bearing , it has not been produced since 2006.
    It will have to be quoted from INA Germany, I will let you know as soon as I hear back from INA.

    Motion Industries 03009493 (appears to be NLA by 2017):
    https://www.motionindustries.com/pro...p?sku=03009493


    Aftermarket bearing ($20)
    32BG05S18G-2DS A/C Compressor Ball Bearing 32x52x18+20
    http://bearingsdirect.com/automotive...2x52x1820.html


    ...try replacing the bearing instead of buying a replacement pump. Read this thread, see post #4:
    http://www.benzworld.org/forums/w124...smog-pump.html

    I couldn't find any detailed bearing replacement threads, this one had a decent photo and some more information:
    http://www.peachparts.com/shopforum/...l-92-400e.html

    Another thread:
    http://www.peachparts.com/shopforum/...g-removal.html

    I just saw another good writeup with photos, here's the link (Photos gone 10/2016)
    http://124forum.dk/w124/files/viewto...t=2005&start=0
    Dave M.
    1997 E420 (Bugeyes)
    1994 E420 (Blondie)
    1994 E500 (Q-ship)
    1992 500E (Mach 5)
    1987 300D (Sportline Stage 2)
    Click here for my website
    Click here for my YouTube channel

  3. #3
    Senior Member
    Join Date
    Dec 2014
    Location
    Norcal
    Posts
    138

    Re: Air Pump Pulley Bearing and Filter Replacement

    Thank you. I've seen some of those, too.

    We'll see how it goes...

  4. The Following User Says Thank You to luckymike For This Useful Post:

    nocfn (09-08-2017)

  5. #4
    Junior Member
    Join Date
    Sep 2013
    Location
    Springfield, OR
    Posts
    10

    Re: Air Pump Pulley Bearing and Filter Replacement

    If it's the same pump as the ones on the M104 engine cars it's not a difficult task. I'm sorry I can't remember where I ordered the bearing from, but it was one of those peachparts links that pointed me to the seller. Let us know how your project goes.

  6. #5
    Junior Member Steve119's Avatar
    Join Date
    Jun 2017
    Posts
    18

    Re: Air Pump Pulley Bearing and Filter Replacement

    My bearing also was making a slight noise on idle.
    I took off the pulley, opened the bearing and sprayed 2 cans of brake cleaner in it. Fully regreased it after that and it's been running quiet and smooth for already over a year

  7. The Following 3 Users Say Thank You to Steve119 For This Useful Post:

    Christian_K (09-08-2017), doolar (09-08-2017), gsxr (09-08-2017)

  8. #6
    Senior Member
    Join Date
    Dec 2014
    Location
    Norcal
    Posts
    138

    Re: Air Pump Pulley Bearing and Filter Replacement

    Closing the loop on this thread:

    I could not find the proper bearing in the United States. My 1995 E420 requires a bearing with dimensions 30mm x 46mm x 18mm. It appears this bearing is proprietary, at least in the U.S.

    I understand, per post #10 in this thread: https://www.500eboard.com/forums/show...628#post150628, that this size bearing is available in Poland. So European owners may have more luck.

    I wound up finding and purchasing a used air pump at a dismantler. I bought it with the intention of swapping the pulley/bearing to my pump but it actually sounds smoother than mine so I'm just going to install the whole thing.

  9. The Following 3 Users Say Thank You to luckymike For This Useful Post:

    gsxr (09-19-2017), maw1124 (09-19-2017), nocfn (09-19-2017)

Similar Threads

  1. Water pump replacement
    By rockingchairmotors in forum Heating and Cooling
    Replies: 83
    Last Post: 03-05-2017, 07:48 AM
  2. Replies: 3
    Last Post: 10-28-2016, 06:00 AM
  3. Rear wheel bearing replacement
    By samiam44 in forum Brakes, Suspension and Steering
    Replies: 19
    Last Post: 10-30-2014, 12:24 PM
  4. Oil filter housing check valve replacement
    By david hendy in forum M119 Engine
    Replies: 1
    Last Post: 09-18-2011, 09:36 AM
  5. HOW-TO: 1994 E500 Air Intake Filter Replacement
    By gerryvz in forum M119 Engine
    Replies: 1
    Last Post: 09-14-2010, 06:58 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •