Back to Library

Range Rover Viscous Coupling

(View Product)

  • Technical

    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

  • Installation

    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