Viscous coupling unit problem?
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Thread: Viscous coupling unit problem?

  1. #1
    SOPHOMORE ROVER
    Join Date
    August 16th, 2005
    Location
    Pacific Palisades CA
    Posts
    288

    Viscous coupling unit problem?

    I have searched on this topic and found quite a bit of interesting info, but a question still remains. The usual test for the viscous coupling unit (VC) is to put transfer case in neutral, jack up one front corner and see if you can turn the wheel by hand (with some force). In the past, I could do this. The car now has 130,000 miles, and I can no longer move the wheel. Took it to the local Indy, and he has another test, which it passed. His test is to let the car idle while turning a tight circle; if it stops, you have a VC problem, if not all is OK. So, she passes one test but not the other. Anyone have any insight here? Should I just replace the VC considering the mileage? Some earlier posts seem to indicate that these things should go out around 100,000 miles.

    Any comments appreciated.

    Wayne
    1999 4.6HSE ("Emma")
    1983 Porsche 944 (mint)
    1987 BMW 325i convert
    2002 ML 320
    1988 Jeep Cherokee (highly modified)

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  3. #2
    JUNIOR ROVER
    Join Date
    January 29th, 2007
    Location
    Toronto,Canada
    Posts
    972

    Re: Viscous coupling unit problem?

    Although I can't be sure I believe ours is original also. I think the tight turn is the best indicator. I tried the elevated test 10k ago and only got very slight movement. No noises on the periodic tight turns so I have actually not worried....yet. Jeff was kind enough to run our vin and a few prior owners put on a lot of miles in short order and the rest of the time she was sitting in numerous dealer/body shop lots. I assume the vc only gets a minor workout on the highway provided the front and rear tires are equal in circumference.
    2004 Epson green 112k miles few records latest diff folly also 1952 Hough payloader 1959 Nuffield 4DM
    2000 kent green 4.0 SE 180,500 miles and working EAS no service records prior to 121,900 and nov 06
    2003 GMC 1500 AWD window van 5.3 L love it in the snow & rain-anytime [on mich cross-terrains] 165 plus K miles.

  4. #3
    JUNIOR ROVER
    Join Date
    February 9th, 2005
    Location
    Fairmont, NE.
    Posts
    567

    Re: Viscous coupling unit problem?

    The Viscous coupling is the blood sucking heart and sole of your full time four wheel drive. If you got over 100,000 miles on your rover I will guarantee you that the Viscous coupling unit is shot. I changed my myself and if you take your time and study it out it is not that big a deal. I bought my new one from the ????? I cant think of the name of the place right now but it is in UK. I had about $600.00 to $ 700.00 in it by the time I got it here and paid duty on it. Drive your rover in a tight circle a couple of times, stop it right there, shut it down and jack up the outside front wheel and if is in bad condition the wheel will kick back. I should not kick back at all if it is in good condition.
    1999 4.0 se Bosch http://www.rwaytools.com

  5. #4
    SOPHOMORE ROVER
    Join Date
    August 16th, 2005
    Location
    Pacific Palisades CA
    Posts
    288

    Re: Viscous coupling unit problem?

    Thanks for the reply guys.

    OK Skip, I will try the jack-up test. I have done this after just driving around a bit, and no kick back, but I have not really stressed it by driving in circles first (hard to find a place to do this that will permit you the time to jack up your car!).

    Wayne
    1999 4.6HSE ("Emma")
    1983 Porsche 944 (mint)
    1987 BMW 325i convert
    2002 ML 320
    1988 Jeep Cherokee (highly modified)

  6. #5
    FRESHMAN ROVER
    Join Date
    June 25th, 2009
    Location
    Calgary, Alberta, Canada (Whole city smells like cow turd, I worry, 'cuz I can't smell it anymore)
    Posts
    217

    Re: Viscous coupling unit problem?

    Do you have a Walmart close by, They usually have acres of asphalt. Just go after they close.
    2001 Range Rover 4.6 HSE, 84 Lincoln Town Car, Signature Series, 95 Ford Escort (Ford POS) 83 Pontiac Firebird (The Firechicken)

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