RE: Born slippy: All about limited-slip differentials
Discussion
teabagger said:
How would one go about checking the state of his viscous LSD?
For Range Rover some had viscous coupling as the centre diff locking mechanism. According to 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 ?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? - 30?. If no rotation or a greater force is required, unit requires replacing.
27 Nm = 20 lbf-ft 20 Nm = 15 lbf-ft
Clearly this may be different for other VC's but it may be of help to do a basic test.
Great article, love this stuff. It also helps when teaching how diffs work for 4x4 off-road use. And that part about Audi and Land Rover...
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