Land Rover Defender 90 Workshop 2nd Edition Nas Rover Manual

COOLING SYSTEM
1
FAULT DIAGNOSIS ENGINE OVERHEATING
Before conducting any cooling system diagnosis:
See
Description and operation, Engine Cooling
1.Is coolant level correct?
NO - Allow engine to cool, top up level to
expansion tank seam.
YES - Continue.
2.Is coolant in radiator frozen?
YES - Slowly thaw and drain system.
See
Adjustment, Coolant Requirements
NO - Continue.
3.Is air flow through radiator restricted or blocked?
YES - Apply air pressure from engine side of
radiator to clear obstruction.
NO -...

26COOLING SYSTEM
2
FAULT DIAGNOSIS ENGINE RUNS COLD
Before conducting any cooling system diagnosis:
See
Description and operation, Engine cooling
1.Check operation of viscous unit.See
Description and operation, Viscous Fan
Is viscous unit operating correctly?
NO -
See Repair, Viscous coupling
YES - Continue.
2.Is thermostat correct type and operating?
See
Repair, Thermostat
If problem is not diagnosed: Continue.
3.Are the air conditioning fans operating
continuously?
YES -
See Electrical Trouble...

COOLING SYSTEM
1
ADJUSTMENT COOLANT REQUIREMENTS
Frost precautions and engine protection.
Cooling systemMUST ALWAYSbe filled and
topped-up with solution of water and anti-freeze,
winter and summer.NEVERuse water alone, this
may corrode aluminium alloy.
CAUTION: Do not use salt water otherwise
corrosion will occur. In certain territories
where only available natural water supply
has some salt content use only rain or distilled
water.
Recommended solutions
Anti-freeze:Universal anti-freeze or permanent...

26COOLING SYSTEM
2
ADJUSTMENT
NOTE: It is not possible to drain all coolant
retained in heater system.
7.Remove engine drain plugs beneath exhaust
manifolds and allow coolant to drain from
engine.
Refill
1.Fit drain plugs to engine.
2.Connect hose to coolant pump and secure with
clip.
3.Fit viscous coupling.
See Repair, viscous
coupling
4.Pour correct solution of water and anti-freeze
into expansion tank until radiator is full.
5.Start engine and run until normal operating
temperature is reached.
6.Top...

COOLING SYSTEM
1
REPAIR EXPANSION TANK
Service repair no - 26.15.01
Remove
WARNING: Do not remove expansion tank
filler cap when engine is hot. The cooling
system is pressurised and personal
scalding could result.
1.Remove expansion tank filler cap by slowly
turning it anti-clockwise. Pause to allow pressure
to escape then continue to turn in same direction
and remove.
2.Position container to collect any coolant spillage.
3.Loosen clip securing radiator hose to expansion
tank.
4.Release radiator hose...

26COOLING SYSTEM
2
REPAIR
5.Position toolLRT-12-093to hold coolant pump
pulley.
6.Loosen viscous coupling nut using tool
LRT-12-094.
7.Remove toolLRT-12-093.
8.Remove viscous coupling assembly.
Do not carry out further dismantling if component
is removed for access only.
9.Remove 4 Allen screws securing fan blades to
coupling.
10.Remove fan blades from coupling.
Refit
11.Clean mating faces of fan blades and coupling.
12.Fit fan blades to coupling and secure with Allen
screws.
13.Position coupling...

COOLING SYSTEM
3
REPAIR RADIATOR
Service repair no - 26.40.01
Remove
1.Disconnect battery negative lead.
2.Drain cooling system.
See Adjustment, drain
and refill
3.Remove 8 screws securing front grille to body.
4.Remove front grille.
5.Remove 4 bolts securing radiator top mountings
to bonnet locking panel and collect nuts.
6.Remove radiator top mountings.
7.Remove fan cowl upper mounting brackets.
8.Loosen clip and disconnect top hose from
radiator.
9.Remove 2 clips securing fasn cowl to radiator. 

26COOLING SYSTEM
4
REPAIR
10.Remove fan cowl.
11.Loosen clip and disconnect throttle body to
radiator hose.
12.Loosen clip and disconnect expansion tank to
radiator hose.
13.Position container beneath engine oil cooler pipe
unions.
14.Loosen engine cooler pipes and disconnect from
radiator.
15.Remove and discard O rings from oil cooler
pipes.
16.Plug oil cooler pipe connections.
17.Loosen clip and disconnect bottom hose from
radiator.
18.Release radiator from lower mounting rubbers
and remove...

COOLING SYSTEM
5
REPAIR THERMOSTAT
Service repair no - 26.45.01
Remove
1.Disconnect battery negative lead.
2.Drain cooling system.
See Adjustment, drain
and refill
3.Loosen clip and disconnect radiator top hose
from coolant outlet elbow.
4.Remove 2 bolts securing coolant outlet elbow to
engine.
5.Remove coolant outlet elbow and collect gasket.
6.Remove thermostat.
Refit
7.Fit thermostat ensuring jiggle pin/vent hole is
uppermost.
8.Fit coolant outlet elbow with new gasket.
9.Fit and tighten bolts...

26COOLING SYSTEM
6
REPAIR
8.Noting their fitted positions, remove 9 bolts
securing coolant pump.
9.Remove coolant pump.
10.Remove gasket.
Refit
11.Clean coolant pump and timing cover mating
faces.
12.Lightly grease NEW gasket and position to
timing cover.
13.Clean threads of all long bolts and coat with
Loctite 572 thread sealant.
14.Position coolant pump, fit bolts and tighten to
28
Nm, 21 lbf ft.
15.Fit coolant pump pulley, fit bolts but do not
tighten.
16.Clean auxillary drive belt pulley grooves and...