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Thread: 93 RRC - Viscous Coupling

  1. 31st October 2006, 10:42 AM #1
    ytt105
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    93 RRC - Viscous Coupling

    I think my viscous transfer is seized. I've tried turning one front wheel but can't get it to move at all. However, I've just removed the front driveshaft and i can get a little bit of slippage if I turn the coupling with a 2 foot bar on a socket.
    Funny thing is the 30mm nut on the transfer case is surrounded by dried silicon.
    I guess that just proves the viscous is stuffed or soon will be!
    Will it be OK to drive for a while with the front driveshaft removed and if i decied to put off the viscous replacement for a while, what symptoms will I get to tell me to replace it?
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  2. 31st October 2006, 12:41 PM #2
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    rovercare
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    Quote Originally Posted by ytt105
    Funny thing is the 30mm nut on the transfer case is surrounded by dried silicon.
    ?
    Thats how you stop the oil coming out between the spline
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  3. 31st October 2006, 12:44 PM #3
    ytt105
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    So it's not totally stuffed, yet!
    Driving around without a front driveshaft for a few weeks won't do any harm will it?
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  4. 31st October 2006, 12:56 PM #4
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    rovercare
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    Quote Originally Posted by ytt105
    So it's not totally stuffed, yet!
    Driving around without a front driveshaft for a few weeks won't do any harm will it?
    Don't know alot about the VC's personally, but i can sell you a complete conversion to LT230, shame your interstate
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  5. 31st October 2006, 01:43 PM #5
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    DeeJay
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    I've forgotten more than I can remember, but if you can select 4wd then do that, and you can get around ok- i'm pretty sure
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  6. 31st October 2006, 02:09 PM #6
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    rovercare
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    Quote Originally Posted by DeeJay
    I've forgotten more than I can remember, but if you can select 4wd then do that, and you can get around ok- i'm pretty sure
    OOOOkay , he's got a VC meaning NO selectable 4wd
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  7. 31st October 2006, 02:54 PM #7
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    101RRS
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    In normal onroad use, one end of the VC is driven by the transmission and the other end is turned by the front drive shaft in turn turned by the front wheels - so on the road the car is essentially 2wd. Input shafts and output shafts of the VC are turning at about the same speed so the VC is unlocked. Off road, when the rear wheels slip a little this manifests itself as the input shaft of the VC turning at a different speed to the output shaft causing the VC to lock and provide drive to the front wheels. When both front wheels and rear wheels are turning at the same speed the VC senses its input and output shafts turning at the same speed and begins to unlock. When offroad, in reality the wheels are always turning at different speeds and the VC remains locked. Also in reality on the road, because of the difference in tyres etc the VC is partially locked and just provides enough slip to prevent transmission windup.

    What does this mean if you remove the front drive shaft? If the VC is serviceable it will detect a difference in the rotation speeds of its input and output shafts - the input is being driven by the transmission and because the output shaft is not being driven by the front driveshaft - as a result the VC will lock up and will stay locked until the car is stopped or the driveshaft is put back in. I do not know if the VC will be damaged in this condition but the most that will happen is that it will lock and stay they way. If the VC is already damaged and locked then the damage is already done.

    In both cases I suspect that driving your RR with front drive removed will be no different to driving a part time 4wd landy (series) in 4wd with the front driveshaft removed - that is the same as any rear 2wd car.

    The risk is that you might cause the current VC to fail that is all - $$$$$

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