Vehicle & Technical > Range Rover

Do I change the Viscous Coupling or Transfer Box?

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Jonny Boaterboy:
My viscus went as well, there is a test you can do which Im sure someone will come up with soon, but if its not coasting round tight bends and and you can here the wheels chaffing especially when there is gravel or grit on the road then thats a good sigh that the viscus has seized. I think the test is to jack up one wheel and see if you can turn it, if you can the viscus is working, if not its seized.

I changed mine myself and its a fairly straight forward job and have not had any other problems since. I would go with just changing the cuppling as it will be less work

good luck mate!

Jonny

Range Rover Blues:
The coupling can be swapped without removing the whole box IIRC, the front housing comes away (you loose all the oil) and in it is the Viscous unit.

The oil in the viscous is sealed in, so unless there are any horroras inside the tranfer box then there is no reaosn to suspect it's any worse than a second hand unit, after all if it's second hand the car is came from wasn't worth keeping on the road, right :wink:

Here's a few ways of checking.

With the handbrake on and the car in neutral, jack up one front wheel.

With mine I can:

Just about undo the propshaft UJ against the stiffness of the Viscous unit, if I push quick the nuts come undone, if I push slow the propshaft turns.

Undo a wheel nut, agai if you push quick the viscous fluid does it's job and locks up, if I lean on the wheel wrench it turns, very, very slowly. That's all you need to happen.

I have heard about Visocu units locking up, it's caused by the Thermo-vicous fluid inside overheateing and turning to a hard rubber like substance that jams the fins within the unit, but I've never seen one, even in all the cars we used to break at my mate's place.

Any one need a transfer box, I have too many spare units here but they do hold their money, I've seen just the Viscous unit go for £150 on flea-bay :o

Dr Strangeglove:
I have been lucky - I got the full unit for £19.  The guy was working on a light weight with a RR chassis and had another two LR's outside.

He was a really nice guy and certainly knew what he was doing - a fantastic set-up and a restored 3l Capri under a dust cover in the corner! =P~

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