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Thread: 89 RR BW TC - how do you know when the center diff is locked?

  1. #1
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    89 RR BW TC - how do you know when the center diff is locked?

    Hi Folks,
    Hoping someone can help...

    After recently taking my newly aquired 89 Rangie for a play in the sand, which felt decidedly gooey, I was wondering if anyone has any tips on knowing when the viscous coupling locks up? I suspect mine wasnt but I'm just guessing really as there is no indication that I am aware of. I gather since they are a sealed unit they dont have any sensors inside.

    Thanks in adv,
    Taz.

  2. #2
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    theres no indicaition as such...


    however if you get a bystander to get out and get in a position to watch the roosters from the wheels if you get at least one on the front axle and one on the rear the chances are that its doing its thing..
    Dave

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  3. #3
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    At home you can test it by jacking up one wheel on one axle with a trolley jack - then VERY CAREFULLY AND SLOWLY - trying to drive forward in low range. Get someone to watch how much the wheel off the ground turns before the TC locks up.

    Or offroad, find a steep hill and get people to watch as mentioned above. I remember Trav's (Aquarangie) rangie with a worn visous t-case only locking up on the 3rd attempt on one hill at Brooklyn. The first 2 attempts it stopped with one front wheel spinning.

  4. #4
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    The test i read in a Range Rover manual was to take the front drive shaft off and try to drive forwards. If you can well it works. There was some specs but i can't remember what they are.
    84' 120" ute - 3.9 isuzu.

  5. #5
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    Coming home from work the other day I thought I saw your wife In a Rangie, now I know I did you must live a whole 600m from my place..

  6. #6
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    Hi Nigel
    Is this the said Rangie.
    It pretty tidy isnt it!!!
    http://members.optusnet.com.au/~taznkaz/mypic21.JPG

    Andrew
    DISCOVERY IS TO BE DISOWNED
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  7. #7
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    As the transfer is permanently attached to the rear driveshaft, the viscous only works on the front axle.
    As I once replied to Trav, if you had a front wheel spinning the viscous was working, you just had no traction. He didn't believe me of course.

    The official way to test is to raise a front wheel and try to turn the front driveshaft with a BIG screwdriver in the UJ. It should turn with great effort and slowly. If it doesn't turn the viscous is stuffed.If it turns easily the viscous is stuffed.
    AFAIK they usually seize as the viscous fluid dries out, and this can be ascertained by turning on shiny concrete eg a supermartket car park. It will squeal like a banshee.
    By the way I also think that my viscous 3.9 does not feel as positive in sand as my old LT95. I think it only takes a tiny bit of slip to feel like the rear is sinking. BUT a 93 4 door is also much heavier than a 77 2 door and most of the extra weight is in the back.
    Regards Philip A

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