Range Rover Classic. Manual — part 53
26
COOLING SYSTEM
RANGE ROVER
2
REPAIR
WATER PUMP
Service repair no - 26.50.01
Remove
WARNING: Disconnect battery negative
terminal to prevent engine being started
before removing drive belts.
1. Drain engine cooling system.
See Adjustment,
Coolant
2. Remove top hose radiator to thermostat.
3. Remove top hose intercooler to induction
manifold.
4. Slacken water pump and power steering pump
pully retaining bolts.
5. Remove drive belt.
6. Remove centre nut from belt tensioner.
7. Manoeuvre pulley upwards and withdraw
tensioner from retaining stud.
8. Disconnect hose thermostat to bottom hose,
release hose from clip on water pump and move
aside.
9. Remove water pump pulley.
10. Remove power steering pump pulley.
11. Remove 8 bolts securing water pump, noting
location of 3 through bolts.
12. Withdraw pump and gasket, clean all gasket
material from mating surfaces.
Refit
13. Refit water pump in reverse order to removal
using new gasket.
RADIATOR
Service repair no - 26.40.01
Remove
1. Drain cooling system.
See Adjustment,
Coolant
2. Disconnect radiator top hose.
3. Remove fan blade assembly.
4. Remove cowl.
5. Disconnect engine oil cooler connections and
turbo intercooler connections from radiator ends.
NOTE: Oil spillage will occur when
connections are loosened. Blank off
exposed oil connections.
6. Disconnect expansion tank bleed hose from
radiator.
7. Remove radiator securing brackets from each
side.
8. Remove radiator unit by lifting from its location.
Check condition of rubber mounting pads.
Refit
9. Check radiator sealing strips are securely
located.
10. Transfer oil cooler adaptors if fitting new radiator.
11. Reverse removal procedure. Tighten oil cooler
connections to
30 Nm, before fitting fan blades
and cowl.
12. Check all connections for leaks.
V8i
1
DESCRIPTION AND OPERATION
ENGINE COOLING
Description
The V8i engine uses a pressurised cooling system
and cross flow radiator which is supplied from a
separate header tank. The coolant radiator also
incorporates a section at the left hand end for cooling
the transmission oil and a section at the other end for
cooling the engine oil.
The belt driven viscous fan and centrifugal water
pump is located in the engine front cover with ports for
circulation of coolant to both banks of cylinders and
cylinder heads. Coolant returns to the top of the
radiator via ports in the inlet manifold where the
thermostat is mounted horizontally.
Coolant also circulates through the vehicle heating
system and is used to heat air entering the inlet
manifold plenum chamber.
Coolant circulation (engine hot)
1. Cross flow radiator
2. Header tank
3. Viscous fan and water pump
4. Heater pipes
5. Plenum chamber connection
6. Thermostat
26
COOLING SYSTEM
RANGE ROVER
2
DESCRIPTION AND OPERATION
COOLANT CIRCULATION
Operation
When the engine is started from cold the thermostat
prevents any coolant circulation through the radiator
by closing off the top hose. During the engine warm
up period, the water pump, pumps coolant around the
cylinders to the rear of the cylinder block along the
main galleries in both cylinder banks. At the rear of
the cylinder block the coolant rises through a large
port in each cylinder head/block joint face, and then
flows forward to connect with ports at the front of the
inlet manifold. From the manifold the coolant is carried
by an external pipe to the heater unit and from the
heater through another external pipe to the pump
inlet.
The coolant circulation through the cylinder block and
heads, does not change when normal running
temperature is reached and the thermostat opens. But
with the thermostat open, coolant flows through the
top hose to the radiator where it is cooled and drawn
back into the pump via the bottom hose.
V8i
3
DESCRIPTION AND OPERATION
Plenum chamber heating
Air entering the plenum chamber is heated by a flow
of coolant from the inlet manifold which returns
through a long hose, to the top right corner of the
radiator.
1. Hot water supply
2. Cold return to radiator
VISCOUS FAN
Description
The viscous drive unit for the engine cooling fan,
provides a means of controlling the speed of the fan
relative to the running temperature of the engine. The
viscous unit is a type of fluid coupling, which drives
the fan blades through the medium of a special
’silicone fluid’ injected into the unit during
manufacture.
1. Drive in from water pump spindle
2. Drive out to fan blades
3. Bi-metal
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