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Thread: Tutorial - Replacing the bearing in a 300TDi airconditioning compressor pulley.

  1. #1
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    Post Tutorial - Replacing the bearing in a 300TDi airconditioning compressor pulley.

    Skill Level (1-10):
    3 (basic workshop skills)

    Time Taken:
    40 minutes

    Tools required:

    10mm, 13mm Sockets and ½” or 3/8” rachet to suit
    Small Breaker Bar ½” drive
    Bent External Circlip Pliers
    Hammer
    Vice (100mm / 4” jaws required)
    Center Punch
    Assorted Larger sockets to drift bearing from pulley.

    Parts Used:
    NACHI bearing No 30BGS10DST2 or 30BGOSS2DS

    Pulley and bearing removal procedure:
    Remove top of radiator cowl
    Remove compressor cover plate
    Turn ignition and air conditioning on (don’t start the motor!)
    Start to undo 10mm bolt retaining pulley
    Turn off ignition.
    Undo drive belt idler pulley by undoing but not removing the 3 10mm bolts.
    Remove the center retaining bolt on compressor, being careful to note and not lose any shim washers on the bolt.
    Slide the end cover of the pulley toward the front the vehicle and carefully remove, once again taking careful note of any shim washers that may be present up the spline in the center of the end plate.
    Using the bent circlip pliers carefully remove the circlip retaining the pulley and bearing.
    Slide pulley forward and off the center shaft.


    Bearing replacement:
    Find a socket that has a small end that will just fit into the center hole of the bearing. Sit the pulley on a flat support or vice jaws, making sure they are just wide enough apart for the bearing to be pushed out without hitting the jaws. Place the socket into the bearing and using a 2lb hammer proceed to carefully drift the bearing from the pulley. Do not use excessive force, use just what you need to get the job done. As the bearing is moving, make sure you drift it so it remains straight in the pulley.

    Once removed you get to clean the pulley and make sure you remove any burrs that may make it hard to fit the new bearing.

    Carefully line up and gently start pushing the new bearing up into the pulley using very light taps with the hammer. DO NOT hit the center of the bearing! Always only apply pressure to the outer shell of the bearing during this part of the job. You are just trying to line it up straight and push it in enough to hold it before the next stage of the job. Make sure you get it as straight and evenly centered as you can. Using the old bearing, place the pulley, bearing and old bearing in the vice and use the vice pressure to push the bearing into the pulley. All the while ensuring it is straight and even. Try to use continuous and even force and ensure you push the bearing fully into the pulley. When you are sure you have it, remove it from the vice and check to see the bearing is hard up against the shoulder of the pulley. You will notice some small dints on the pulley. These were there to retain the bearing. Using a center punch, lightly pop in these dints to spread them back over the edge of the bearing to retain it as before. One pop in each dint will do just fine.


    Reassembling the pulley to the compressor etc is just the reverse of the dismantling procedure.

    Make sure you get those shims back where they originally came from.

    DO NOT over tension the drive belt or you will be doing this again in a few months time.

    You have just saved your self a swag of money!

    Gallery of larger pics etc is here
    http://www.aulro.com/app/showgallery.php?cat=671
    Last edited by incisor; 26th January 2007 at 08:20 AM.
    1998 Discovery 300TDi Manual SE7
    1996 Discovery 300TDi Auto
    2012 SZ Territory TX 2.7TDCi

    "Make the lie big, make it simple, keep saying it, and eventually they will believe it." -- a warning from Adolf Hitler
    "If you don't have a sense of humour, you probably don't have any sense at all!" -- a wise observation by someone else
    'If everyone colludes in believing that war is the norm, nobody will recognize the imperative of peace." -- Anne Deveson
    “What you leave behind is not what is engraved in stone monuments, but what is woven into the lives of others.” - Pericles
    "The happiness of your life depends upon the quality of your thoughts." Marcus Aurelius

  2. #2
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    Well Done!

  3. #3
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    Update,
    Nachi have updated the bearing, same bearing different number and colour.
    Old 30BGS10DST2 and it's green.
    New 30BGOSS2DS and it's a browney orangey colour.

    Old number was not even on their computor anymore. Hope this helps.

  4. #4
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    Thanks incisor
    Have just replaced the bearing in mine!
    When I contacted Allied Bearings at Nerang QLD, they finally tracked down the right bearing with the corrected code as 30BG05S2G-2DS, that's with the brown coloured seal.
    Thanks again, works treat!

  5. #5
    pdrayton Guest

    Fantastic!

    I pulled the pulley off my 93 toyota and it has the same bearing, so I searched the internet and this tutorial popped up.

    Up til then I was confused about where to push the bearing out or if can be done.

    Problem solved! Awesome! thanks for that.

    Paul

    EDIT: The correct identity of the bearing is as tcgooge said , ie 30BG05S2G-2DS. Those suckers can be hard to read....

  6. #6
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    Thanks Inc, my only prob is that the pics are too small
    Carlos
    1994 Land Rover Discovery 300tdi
    1996 Land Rover Discovery 300tdi
    1963 Land Rover Series 2a 88
    Youtube Channel: https://www.youtube.com/channel/UCu3...BtsNIuTyGkAo5w
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  7. #7
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    even the bigger ones i put in this link

    Message - AULRO Photo Gallery
    1998 Discovery 300TDi Manual SE7
    1996 Discovery 300TDi Auto
    2012 SZ Territory TX 2.7TDCi

    "Make the lie big, make it simple, keep saying it, and eventually they will believe it." -- a warning from Adolf Hitler
    "If you don't have a sense of humour, you probably don't have any sense at all!" -- a wise observation by someone else
    'If everyone colludes in believing that war is the norm, nobody will recognize the imperative of peace." -- Anne Deveson
    “What you leave behind is not what is engraved in stone monuments, but what is woven into the lives of others.” - Pericles
    "The happiness of your life depends upon the quality of your thoughts." Marcus Aurelius

  8. #8
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    Hi - thanks - useful information

    I´m Henry Miles, from Argentina. I own a Discovery 1996. Excellent information posted. I´ll put hands on to replace that bearing.
    Best regards

  9. #9
    harry's Avatar
    harry is offline ForumSage Silver Subscriber
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    oh bugger, i should have known someone would have done this already.

    thanks dave.
    Safe Travels
    harry

  10. #10
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    Just doing my MY95 V8 compressor and it is the same bearing. Seems to be a very common bearing.

    My local bearing shop said that part number didn't exist any more and sold me a Narchi with an updated part number of 30BG05S2G2DS and cost $31.68.

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