Infiniti QX4 (R50). Manual — part 497
Thermostat
REMOVAL AND INSTALLATION
NBLC0021
SLC329B
SLC962AA
1.
Remove under cover.
2.
Remove suspension member stay.
3.
Drain coolant from radiator.
4.
Remove drive belts.
5.
Remove water drain plug on water pump side of cylinder block.
6.
Disconnect lower radiator hose.
7.
Remove water inlet and thermostat assembly.
I
Do not disassemble water inlet and thermostat. Replace
them as a unit, if necessary.
SLC948A
8.
Install thermostat with jiggle valve facing upward.
I
After installation, run engine for a few minutes, and check
for leaks.
I
Be careful not to spill coolant over engine compartment.
Use a rag to absorb coolant.
9.
Reinstall any removed parts in reverse order of removal.
SLC949A
INSPECTION
NBLC0022
1.
Check valve seating condition at ordinary room temperatures.
It should seat tightly.
2.
Check valve opening temperature and maximum valve lift.
Standard
Valve opening temperature
76.5°C (170°F)
Valve lift
More than 8.6 mm/90°C
(0.339 in/194°F)
ENGINE COOLING SYSTEM
Thermostat
LC-16
3.
Then check if valve closes at 5°C (9°F) below valve opening
temperature.
Water Control Valve
REMOVAL AND INSTALLATION
NBLC0032
SLC330B
1.
Water outlet housing
2.
Water control valve
3.
Water outlet
4.
Water hose
5.
Cylinder block water outlet
6.
Thermal transmitter
7.
Engine coolant temperature sen-
sor
1.
Release fuel pressure.
Refer to EC-39, “Fuel Pressure Release”.
2.
Remove under cover.
3.
Remove suspension member stay.
4.
Drain coolant from radiator.
5.
Remove engine cover.
6.
Remove air duct with air cleaner assembly.
7.
Disconnect wires, hoses, harness and so on.
8.
Remove upper intake manifold corrector.
9.
Remove intake manifold corrector support bolts.
10. Remove lower intake manifold corrector.
11. Disconnect injector harness connectors.
12. Remove injector tube.
13. Remove intake manifold.
14. Remove water outlet housing and water control valve.
GI
MA
EM
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE COOLING SYSTEM
Thermostat (Cont’d)
LC-17
SLC334B
15. Install water control valve and water outlet housing.
a.
Install gum ring to thermostat.
b.
Point the arrow on the upper surface of the valve to the front
of the engine, and also be sure to install the protrusions and
the valve stopper so that they are aligned in a straight line.
16. Reinstall any removed parts in reverse order of removal.
I
When installing intake manifold, injector tube and intake
manifold collectors, refer to EM-12, “TIGHTENING PROCE-
DURES”.
I
After installation, run engine for a few minutes, and check
for leaks.
I
Be careful not to spill coolant over engine compartment.
Use a rag to absorb coolant.
SLC252B
INSPECTION
NBLC0033
1.
Check valve seating condition at ordinary room temperatures.
It should seat tightly.
2.
Check valve opening temperature and maximum valve lift.
Standard
Valve opening temperature
95°C (203°F)
Valve lift
More than 8.0 mm/108°C
(0.315 in/226°F)
3.
Then check if valve closes at 5°C (9°F) below valve opening
temperature.
ENGINE COOLING SYSTEM
Water Control Valve (Cont’d)
LC-18
Radiator
REMOVAL AND INSTALLATION
=NBLC0023
1. Remove under cover.
2. Remove suspension member stay.
3. Drain coolant from radiator.
4. Disconnect radiator upper and lower hoses.
5. Remove upper and lower radiator shroud.
6. Remove A/T oil cooler hoses.
7. Disconnect reservoir tank hose.
8. Remove radiator mounting bracket.
9. Remove radiator.
10. After repairing or replacing radiator, install any part removed in reverse order of removal.
When filling radiator with coolant, refer to MA-14, “Changing Engine Coolant”.
SLC331B
GI
MA
EM
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE COOLING SYSTEM
Radiator
LC-19
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