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Range Rover Viscous Coupling


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Product Information

This is a rebuilt Range Rover Viscous Coupling supplied on an exchange basis.

A common problem with the Range Rover BW transfer case is a "seized viscous coupling". This can easily be identified by the effect it has on cornering, the tyres will "chirp" or "scrub", as the vehicle is effectively permanently in diff lock. As a confirming check, put transfer case in "neutral", handbrake on, jack up one front wheel and try to turn it, it should turn slowly with resistance, if locked solid the viscous coupling is seized, and will need changing before any damage to the diffs or CV joints occur.

A more comprehensive check of the unit is in the Technical info section below.

The coupling can be replaced with the transfer case in the vehicle but the case will need securely supporting, as the RH mounts are part of the coupling housing.

This is the same part in the Classic and P38 Range Rover, RTC6044

Please note that if the vehicle is approaching its century, i.e. 100k miles it will be well worthwhile considering a replacement transfer box as the chain, output shaft, and pump will almost certainly need attention. Please refer to transfer box section for further details.

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Product Code: VCREB

Installation Information » (Click to Expand Collapse)

How to fit a viscous coupling unit

1) Remove front prop shaft

2) Drain oil from transfer box

3) Support gearbox and remove right hand gearbox mount

4) Remove bolt holding Viscous Coupling housing to transfer box

5) Rotate, to break silicone, and remove Viscous Coupling housing

6) Remove flange nut and flange and press out Viscous Coupling

7) Clean all joint faces

8) Replace Viscous Coupling and reassemble in reverse order

Technical Information / FAQ's » (Click to Expand Collapse)

RRC, Workshop Manual, Section 41 Transfer Gearbox, Overhaul, Dismantle, Inspection & Overhaul.

You can either do this test on the bench or in the car with the handbrake on and one front wheel lifted.

Viscous unit - rolling resistance Bench check NOTE: Testing should be carried out in an ambient of 20 deg C.

1) Secure the output shaft ...

2) Apply a clockwise torque of 27 Nm to the (front propshaft) output flange nut. If no resistance to turn is felt, unit requires replacing.

3) If resistance to turn is felt, apply a clockwise torque of 20Nm to the (front propshaft) output flange nut for 1 minute, this should result in a rotation of approximately 25 deg - 30 deg. If no rotation or a greater force is required, unit requires replacing.

27 Nm = 20 lbf-ft 20 Nm = 15 lbf-ft

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