Range Rover Workshop Manual - System Description and Operation ...

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ENGINE – TD6The annular channel extends over approximately 300 degrees. Due to the length of the annular channel and the smallnozzle orifice hydraulic oil flows between the upper and lower hydraulic chamber only in the case of vibrations up tothe natural frequency of the engine (approximately. 10 Hz), thus producing a vibration absorber effect.At higher frequencies, the equalisation between the hydraulic chambers is inhibited by the length of the annularchannel and the small nozzle orifices. In practical terms, equalisation between the upper and lower hydraulic chamberdoes not take place.Diaphragms (5) are fitted in the holes (7) of the nozzle plates in order to achieve good acoustic characteristics at highfrequencies with small amplitude."Soft" Engine MountAt idling speed and in the speed range close to idling, the spring (13) is pulled down by applying vacuum at vacuumconnection (1). The channel (14) in the centre of the upper nozzle plate now acts as a bypass between the upper andlower hydraulic chamber. This allows the hydraulic fluid to flow unrestricted between the upper and lower chambers.The increase in the fluid flow rate softens the damping action of the hydraulic mount, reducing the dynamic rigidity ofthe engine mount.EDC ParametersThe ECM controls the engine mounts based on the following parameters:Engine SpeedVehicle speedSwitching Value900 RPM60 km/h (36 MPH)DESCRIPTION AND OPERATION 12-1-17
ENGINE – TD6Vacuum SupplyDistributorThe vacuum necessary for activating the engine mounts is obtained via a distributor located in the vacuum linebetween the vacuum pump and brake booster.For this purpose, the vacuum line of the damping-controlled hydraulic mount is connected to the long outlet of thedistributor.The vacuum varies within the pressure range from 0.5 to 0.9 bar. It is switched by means of a damping controlactuator.12-1-18 DESCRIPTION AND OPERATION
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Page 6 and 7: ENGINE - TD6Oil Pressure SwitchThe
Page 8: ENGINE - TD6Camshaft Timing Compone
Page 11 and 12: ENGINE - TD6Cylinder Head GasketThe
Page 13 and 14: ENGINE - TD6Belt Drive1234756M12 77
Page 15 and 16: ENGINE - TD6The oil pump is driven
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Range Rover Workshop Manual - System Description and Operation ...

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