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What causes failure in ird unit of freelander?

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2008-02-21 19:08:46

The best answer to this question I have ever seen is on It reads:

QUOTE The Freelander has 3 main drivetrain problems areas, the

Intermediate Reduction Drive (IRD), Viscous Coupling (VC) and the

rear differential. The reason for this is the front wheels on the

Freelander are driven faster than the rear wheels so it handles

well, like a front wheel drive car. To accommodate this ratio

difference, a VC is fitted inline with the rear propshaft which

thus is constantly slipping. On the earlier models this ratio

difference was too great resulting in the viscous coupling working

overtime and failing by siezing solid. When the viscous coupling is

too tight or seized solid the front tyres are fighting the rears as

the transmission is "winding up", initially this just wears the

tyres (causing a "saw tooth" effect) but it also puts increased

load on the IRD and rear diff as they are fighting each other

causing rapid wear on both and ultimately failure of one or both.

UNQUOTE The source of this comment is the Ashcroft Transmissions


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