Range Rover Classic. Manual — part 63
R380
1
SPECIFICATIONS, TORQUE
TORQUE VALUES
NOTE: Torque wrenches should be regularly checked for accuracy to ensure that all fixings are
tightened to the correct torque.
Nm
Bottom cover to clutch housing
8
. . . . . . . . . . . . . . . . ...
Extension case to gearcase
25
. . . . . . . . . . . . . . . . . ...
Slave cylinder to bell housing
25
. . . . . . . . . . . . . . . . .
Bell housing to gearbox
70
. . . . . . . . . . . . . . . . . . . .
Oil drain plug
50
. . . . . . . . . . . . . . . . . . . . . . . ..
Breather
15
. . . . . . . . . . . . . . . . . . . . . . . . . .
Oil level plug
30
. . . . . . . . . . . . . . . . . . . . . . . ..
Gear change housing to extension case
25
. . . . . . . . . . . . .
Cover to gear change housing
10
. . . . . . . . . . . . . . . . ...
Bell housing to cylinder block
40
. . . . . . . . . . . . . . . . . .
NOTE: Torque values below apply to all screws and bolts used unless otherwise specified.
METRIC
Nm
M5
6
. . . . . . . . . . . . . . . . . . . . . . . . . ..
M6
9
. . . . . . . . . . . . . . . . . . . . . . . . . ..
M8
25
. . . . . . . . . . . . . . . . . . . . . . . . . .
M10
45
. . . . . . . . . . . . . . . . . . . . . . . . ...
M12
90
. . . . . . . . . . . . . . . . . . . . . . . . ...
M14
105
. . . . . . . . . . . . . . . . . . . . . . . . ..
M16
180
. . . . . . . . . . . . . . . . . . . . . . . . ..
UNC / UNF
1/4
9
. . . . . . . . . . . . . . . . . . . . . . . . . ..
5/16
24
. . . . . . . . . . . . . . . . . . . . . . . . ...
3/8
39
. . . . . . . . . . . . . . . . . . . . . . . . . .
7/16
78
. . . . . . . . . . . . . . . . . . . . . . . . ...
1/2
90
. . . . . . . . . . . . . . . . . . . . . . . . . .
5/8
136
. . . . . . . . . . . . . . . . . . . . . . . . .
BORG WARNER
1
DESCRIPTION AND OPERATION
DESCRIPTION
The Borg Warner transfer gearbox incorporates a
single epicyclic gear set which is driven by the main
gearbox output shaft to provide high, neutral or low
gear ratios.
With high or low gear selected, power is transmitted
by a Morse Chain to the front and rear output shafts
via a differential and a limited slip viscous unit.
The gear lever allows neutral, high or low to be
selected. A differential lock is not necessary as this
function is automatically performed by the viscous
coupling unit.
Lubrication is by a low pressure plunger type oil
pump, driven by the epicyclic gear set. Oil is delivered
to the gears and bearings via oilways in the
components.
The viscous coupling though partly immersed in
lubricating oil, is a self contained and sealed unit.
Illustration RR3548M showing the component parts of
the transfer box, is a useful cross reference when
studying the following power flow diagrams.
1. Epicyclic gear set
2. Morse chain
3. Differential
4. Viscous unit/front output shaft
5. High,neutral,low selection sleeve
6. Rear output shaft
41
TRANSFER GEARBOX
2
DESCRIPTION AND OPERATION
Power flow - operation
Broken lines in the following Illustration indicate
gear or sliding splined connections.
High ratio
Moving the gear lever to the high position seen in
RR3551M causes the sleeve 3 to engage directly with
the sun gear 2, allowing the power to by-pass the
planetary gear set 5 and provide a direct drive to the
drive sprocket 7, and Morse chain 8 to the differential
and output shafts.
BORG WARNER
3
DESCRIPTION AND OPERATION
Low ratio
In low gear the selector sleeve 3 connects with the
planet carrier 6 and planet gears 5 to provide low
ratio.
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