Vehicle & Technical > Range Rover

Do I change the Viscous Coupling or Transfer Box?

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Dr Strangeglove:
I think my viscous coupling has gone on my 3.9 EFi (1991).  I need to know a definite test to make sure that the one on it is duff before I go taking it off so can anyone tell me for definite how to check?

I have already purchased a transfer box and coupling from ebay.  It has the hand break cable etc. attached.  Do I change the full unit or shall I just change the viscous unit.

Thanks

Mick

pongo_bob:
I'm sure mine is seized. I'm on 110K miles. I jacked up the front two wheels , put a large screwdriver through the front propshaft UJ and it moves slowly about 1/16 of a turn either way using all the force I can muster. The steering feels heavy and it doesn't seem to coast at all.

I bought a VC from http://www.legs.co.uk/ . The only difference between theirs and LR is £600 and the box it comes in :shock:

Because I don't have  a hoist or a pit I keep putting this job off. If anyone has got any tips I'm all ears.

Skibum346:
Typical symptom is scrabbling on full lock at slow speed from front wheels think there is also a test involving jacking the front but not sure.

I'd change the whole lot. if the VC has siezed then it'll be a fair bet the chain and various other components will need to be looked at as well soon so your just putting off the inevitable.

Change it and refurb it... stick it in the garage on the spares shelf for next time!

Good luck

Skibum

Dr Strangeglove:
I will attempt the whole unit then.  I will need to fit a new breather pipe and I think I will also have a look at the hand-break before I put it on.  Is it worth doing anything else to it whilst it is off the vehicle?

It has the hand break cable on it which seems in decent condition, I presume it is better to leave that on and connect that to the hand-break!

Any tips please let me know.

Skibum346:
Not sure if it affects your vehicle but I remember hearing something about some gearboxes do not have a cross drilled output shaft leading to drying and accelerated wear.

Good chance to check the state of it though if it's in need of TLC I'd suspect it's a change the gearbox job.

Skibum

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