Mass Damper (Td6 models only) On Td6 engine models, amass damper is fitted to the front casing assembly. The damper is located next to the front output flange and secured to the casing with bolts. The damper absorbs vibration and resonance inherent with diesel engines, reducing passenger compartment noise and vibration. The front casing assembly houses amounting bush which differs in its material between engine variants. The bushes are identified by a colour code red is for V engine models and blue is for Td6 engine models. The construction of the bushes is visually identical. The material from which the bushes are constructed differs to absorb the differing vibrational frequencies between the engine variants. Drive is passed from the input shaft and via the Torsen® differential to the mainshaft and the drive sprocket assembly. The mainshaft rotates and passes the rotational motion to the rear propshaft. The drive sprocket assembly rotates and passes this rotation, via the chain, to the front propshaft. The drive sprocket carries a 3/8” pitch drive chain which drives a sprocket which is integral with the front output shaft. Because both sprockets are the same, with the same number of drive teeth, the rotational motion of the drive sprocket is identical to that of the front output shaft sprocket. The 50:50 torque output ratio is produced from the Torsen® differential unit. This unit can drive the output to the main shaft and the drive sprocket assembly at a 50:50 ratio during normal driving conditions. The transfer box requires a unique oil developed with NVG and Burmah-Castrol specifically for the Land Rover transfer box. The oil is a fully synthetic with the following specification BOT 26 FMB 1 W. The oil contains unique additives which enhance the transfer box operation. No other oil must be used in the transfer box. Should the transfer box require repair, the only serviceable items are the input and two output shaft seals, the drain and filler plugs, the actuator and gearbox assembly and the breather tube. Any repairs beyond the items listed requires a replacement transfer box. A filler/level plug is provided to ensure that the correct oil level is achieved after a service repair has been carried out. The level must be checked and adjusted with the transmission fully assembled and the vehicle on level ground. The transfer box contains 0.996 litres of oil. The transfer box is a fill for life unit and no level check is required at service unless a leak is present.