Defender 90 NAS. Manual — part 31
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 from expansion tank.
5. Loosen clip securing coolant hose to underside
of expansion tank.
6. Release coolant hose from expansion tank.
7. Remove overflow pipe from expansion tank.
8. Remove clamping bolt from expansion tank
mounting bracket and collect nut and washer.
9. Lift mounting bracket clamp and remove
expansion tank.
Refit
10. Fit expansion tank to mounting bracket.
11. Fit and tighten nut and bolt securing expansion
tank to mounting bracket.
12. Fit overflow pipe to expansion tank.
13. Connect coolant hose to underside of expansion
tank and secure with clip.
14. Connect radiator hose to expansion tank and
secure with clip.
15. Remove container.
16. Top-up engine coolant.
VISCOUS COUPLING
Service repair no - 26.25.19
Remove
1. Disconnect battery negative lead.
2. Remove 2 screws securing radiator top
mountings to fan upper cowl.
3. Release 2 clips securing fan upper cowl to lower
cowl.
4. Remove fan upper cowl.
26
COOLING SYSTEM
2
REPAIR
5. Position tool LRT-12-093 to hold coolant pump
pulley.
6. Loosen viscous coupling nut using tool
LRT-12-094.
7. Remove tool LRT-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 assembly and start tightening
nut.
14. Position tool LRT-12-093 to hold pulley.
15. Tighten viscous coupling assembly nut using
tool LRT-12-094.
16. Remove tools.
17. Fit fan upper cowl and secure with clips.
18. Align fan cowl fixings to upper mounting brackets
and secure with screws.
19. Reconnect battery negative lead.
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.
26
COOLING 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 radiator.
Refit
19. Fit radiator and secure to lower mounting
rubbers.
NOTE: Ensure condenser lower mounting
brackets are located to radiator lower
mounting brackets.
20. Connect bottom hose to radiator and secure with
clip.
21. Remove plugs from engine oil cooler pipe
connections.
22. Clean oil cooler pipe connections.
23. Lubricate NEW ’O’ rings with clean engine oil
and fit to pipes.
24. Connect oil cooler pipes to radiator and tighten
unions to
30 Nm, 22 lbf ft.
25. Remove container.
26. Connect expansion tank hose to radiator and
tighten clip.
27. Connect throttle body hose to radiator and
tighten clip.
28. Fit fan cowl to radiator.
29. Fit fan cowl lower retaining clips.
30. Connect top hose to radiator and tighten clip.
31. Fit fan upper cowl and secure with clips.
32. Fit fan cowl upper mounting brackets.
33. Fit radiator top mountings and secure with
screws and bolts.
34. Fit front grille and secure with screws.
35. Refill cooling system.
See Adjustment, drain
and refill
36. Reconnect battery negative lead.
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