105 rear diff oil change

mike smith Feb 12, 2018

  1. mike smith

    mike smith Member I am in australia

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    I am about to tackle the rear diff oil change. Before i bugger this one up, is there anything i should know. Yes i have warmed it up.

    Go the mighty Terriers.
     
  2. Firewout

    Firewout Well-Known Member I am in belgium

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    Before you let all the oil out, make sure the filling plug hasn't seized. Makes filling it up again so much easier.
     
    flint likes this.
  3. mike smith

    mike smith Member I am in australia

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    Yes mate, thanks.
     
  4. mike smith

    mike smith Member I am in australia

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    Ok so smart buttocks me went under the vehicle, i huffed and i puffed but for the life in me, i cannot open the fill bolt. I had it hot , a couple of burns will tell you that, but guys the dam thing will not shift. No i did not undo the drain plug yet, i think i may have a similar problem there.

    Does anybody have any suggestions what to do. I was thinking heating it with a blow torch, but that may very well effect the metal housing, if there is somebody out there with a good idea, please tell me. It also tells me that the previous richard head who owned the vehicle, hasnt change the diff oil.
     
  5. Firewout

    Firewout Well-Known Member I am in belgium

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    A spray of wd40 every day during a week. And then try again.
     
  6. Chris

    Chris Super Moderator Supporter I am in europe

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    Mike really important to be careful with that plug. Easy to get a rag-on and just bash at it in frustration. Keep calm. First thing it to get a really really good fitting tool. Many of us will take a 24mm socket and face it off in the lathe to get rid of the bevel. The nut is so flat, you can just spin off it. Also when you use a big bar, it effectively places an uneven twist on the plug. Better to use an impact gun and faced off socket and give it a blast of vibration. Heat certain is your friend here too. OK you might worry about setting fire to the oil inside. I wouldn't worry too much about that. Just give it local heat then cool it with a spray like WD40 a few times. If all else fails you might have to weld a nut onto it. That certainly works. Oh and order a new plug.

    The drain plug usually gives up without such a fight.
     
    flint likes this.
  7. Ben Stratford

    Ben Stratford Well-Known Member Supporter I am in england

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    Had the same issue Mike. Had to weld a big nut on there. Make sure it is central though. The new plugs have a 10mm hex key which has proven to be very reliable. Changed all 8 to the same now (diffs, gbox, tbox)
     
  8. Animal Mother

    Animal Mother Well-Known Member Supporter I am in wales

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    Try Plusgas rather than WD40. It's a much more effective penetrant.
     
  9. flint

    flint Well-Known Member Supporter I am in great_britain

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    Mine was stuck fast and someone had rounded it off before me trying to shift it. I had to hammer on the next size down impact socket and use an impact gun in the end.
     
  10. Chris

    Chris Super Moderator Supporter I am in europe

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    I agree fully with AM. WD40 is pants. I just didn't know what they had down under. I don't use it for anything other than to keep in my outdoor kit because at least they do miniature cans of the stuff.
     
  11. Towpack

    Towpack Well-Known Member I am in england

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    Agree 100% on the wd40. I use Corrosion Block just about everywhere now.
    I managed to round off the plug in my rear diff but got away with tapping on the next smaller size socket. When it was off I carefully re-filed the flats to make it a very snug fit in a smaller socket.
     
  12. flint

    flint Well-Known Member Supporter I am in great_britain

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    +1 on WD40. When I looked to see what Plus Gas was made of, it's mostly kerosene. I remembered seeing something on an engineering site about using kero with a bit of ATF mixed in to free up things, gave it a try and it seemed to work quite well. Another swore by acetone with ATF, haven't tried that yet.
     
  13. Towpack

    Towpack Well-Known Member I am in england

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    I tried the acetone and aft but it didn’t seem to mix that well.
     
  14. moggy1968

    moggy1968 Well-Known Member

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    I had to get a long bar on mine, twatting a short bar with a hammer will just shag the nut because it’s too shallow. Slightly bizarrely an af socket fitted better than the metric ones.
     
  15. Chris

    Chris Super Moderator Supporter I am in europe

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    Must've been a Milner's nut Moggy. Ha ha
     
  16. moggy1968

    moggy1968 Well-Known Member

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    Nah, it didn’t actually break!!
     
  17. chapel gate

    chapel gate Well-Known Member Supporter I am in england

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    make sure your using a 8 point socket, makes a huge difference.
     
  18. StarCruiser

    StarCruiser Well-Known Member Supporter Guru I am in uk

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    8 point? I thought they only existed on immersion heaters! :think:
     
  19. chapel gate

    chapel gate Well-Known Member Supporter I am in england

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    sorry, 6..
    whats two points amongst friends..:icon-biggrin:
     
    StarCruiser likes this.
  20. chapel gate

    chapel gate Well-Known Member Supporter I am in england

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    or is it 8? I'm gonna have to count the points on my 8/6 point socket set..
     
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