Discovery 2. Manual — part 11
GENERAL DATA
04-9
Cooling system - Td5
Type
Pressurised, spill return partial flow, thermostatically controlled
Cooling fans
11 blade axial flow on viscous coupling and 11 blade axial flow electric
Electric cooling fan switching points:
For A/C system:
⇒
On
When vehicle speed is 50 mph (80 km/h) or less and ambient
temperature is 28
°
C (82
°
F) or more
⇒
Off
When vehicle speed increases to 62.5 mph (100 km/h) or ambient
temperature decreases to 25
°
C (77
°
F)
For engine cooling during normal running:
⇒
On
110
°
C (230
°
F)
⇒
Off
105
°
C (221
°
F)
For engine cooling at ignition off (to counteract heat
soak):
⇒
On
If, within 10 seconds of ignition off, engine coolant temperature is 105
°
C (221
°
F) or more
⇒
Off
After 10 minutes or if engine coolant temperature decreases to 100
°
C
(212
°
F)
Coolant pump
Centrifugal impeller, belt driven from crankshaft
Thermostat
Waxstat with pressure relief valve
Thermostat opening temperature:
⇒
Initial opening
82
°
C (179
°
F)
⇒
Fully open
96
°
C (204
°
F)
Expansion tank cap relief valve - system operating
pressure
1.4 bar (20.3 lbf.in
2
)
Fuel cooler thermostat opening temperature
82
°
C (179
°
F)
GENERAL DATA
04-10
Cooling system - V8
Type
Pressurised, spill return, thermostatically controlled water and
antifreeze mixture. Vertical flow radiator with remote header tank and
pump assisted
Cooling fans
9 blade axial flow on viscous coupling and 11 blade axial flow electric
Electric cooling fan switching points:
For A/C system:
⇒
On
When vehicle speed is 50 mph (80 km/h) or less and ambient
temperature is 28
°
C (82
°
F) or more
⇒
Off
When vehicle speed increases to (62.5 mph (100 km/h) or ambient
temperature decreases to 25
°
C (77
°
F)
For engine cooling during normal running:
⇒
On
100
°
C (212
°
F)
⇒
Off
94.5
°
C (202
°
F)
For engine cooling at ignition off (to counteract heat
soak):
⇒
On
If, within 10 seconds of ignition off, intake air temperature is 60
°
C (140
°
F) or more and engine coolant temperature is 110
°
C (230
°
F) or more
⇒
Off
After 10 minutes or if engine coolant temperature decreases to 100
°
C
(212
°
F)
Coolant pump
Centrifugal impeller, belt driven from crankshaft
Coolant pump drive ratio
1.293 : 1
Coolant pump output at 1000 rev/min
10 litres/min (2.64 US galls/min) at 0.7 bar (10 lbf.in
2
)
Thermostat
Waxstat with pressure relief valve
Thermostat operating temperature:
⇒
Initial opening
82
°
C (179
°
F)
⇒
Fully open
96
°
C (204
°
F)
Expansion tank cap relief valve - system operating
pressure
1.4 bar (20 lbf.in
2
)
GENERAL DATA
04-11
Clutch - Td5
Type
Diaphragm spring, hydraulically operated with self-centering,
preloaded release bearing
Drive plate diameter
267 mm (10.5118 in)
Pressure plate diameter
267 mm (10.5118 in)
Clutch plate friction material
Verto F202
Diaphragm finger height when clamped on a 8.5 mm
(0.33 in) thick gauge plate
42.5 to 48.5 mm (1.673 to 1.904 in)
Diaphragm finger clearance (service limit)
1.00 mm (0.040 in)
Clutch plate thickness under 6500 N (1461 lb) axial
load:
⇒
New
8.2 to 8.8 mm (0.33 to 0.34 in)
⇒
Service limit
7.0 mm (0.27 in)
GENERAL DATA
04-12
Clutch - V8
Type
Diaphragm spring, hydraulically operated with self-centering,
preloaded release bearing
Clutch plate friction material
APTEC 385
Drive plate diameter
267 mm (10.5118 in)
Pressure plate diameter
268 mm (10.5512 in)
Clutch plate thickness (clamped state)
⇒
New
8.4-8.9 mm (0.33-0.35 in)
⇒
Service limit
7.1 mm (0.28 in)
Rivet depth:
⇒
New
1.73 mm (0.07 in)
⇒
Service limit
0.25 mm (0.01 in)
Clutch plate runout:
⇒
New
0.5 mm (0.02 in)
⇒
Service limit
0.5 mm (0.02 in)
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