Nissan Frontier. Instruction — part 227
WATER INLET AND THERMOSTAT ASSEMBLY
CO-55
< REMOVAL AND INSTALLATION >
[VQ40DE]
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WATER INLET AND THERMOSTAT ASSEMBLY
Exploded View
INFOID:0000000009478193
Removal and Installation
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WARNING:
Do not remove the radiator cap when the engine is hot. Serious burns could occur from high pressure
engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter
of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.
NOTE:
When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-
ing.
REMOVAL
1. Remove engine cooling fan (Motor driven type). Refer to
CO-48, "Removal and Installation (Motor driven
2. Disconnect radiator hose (lower) and oil cooler hose from water inlet and thermostat assembly.
3. Remove water inlet and thermostat assembly.
CAUTION:
• Do not disassemble water inlet and thermostat assembly.
• Replace water inlet and thermostat assembly as a unit.
INSPECTION AFTER REMOVAL
1. Check valve seating condition at room temperature. It should seat tightly.
1.
Water inlet and thermostat assembly 2.
Gasket
PBIC2839E
SLC962AB
CO-56
< REMOVAL AND INSTALLATION >
[VQ40DE]
WATER INLET AND THERMOSTAT ASSEMBLY
2. Check valve operation.
• Place a thread so that it is caught in the valve of the thermo-
stat. Immerse fully in a container filled with water. Heat while
stirring.
• The valve opening temperature is the temperature at which
the valve opens and falls from the thread.
• Continue heating. Check the full-open lift amount.
NOTE:
The full-open lift amount standard temperature is the reference
value.
• After checking the full-open lift amount, lower the water tem-
perature and check the valve closing temperature.
If out of the specification range, replace water inlet and thermostat assembly.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
Do not spill engine coolant in engine room. Use shop cloth to absorb engine coolant.
INSPECTION AFTER INSTALLATION
• Check for engine coolant leaks. Refer to
• Start and warm up engine. Visually check for engine coolant leaks. Repair as necessary.
SLC949A
Thermostat
Standard
Valve opening temperature
Refer to
Full-open lift amount
Valve closing temperature
WATER OUTLET AND WATER PIPING
CO-57
< REMOVAL AND INSTALLATION >
[VQ40DE]
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D
E
F
G
H
I
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K
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M
A
CO
N
P
O
WATER OUTLET AND WATER PIPING
Exploded View
INFOID:0000000009478195
Removal and Installation
INFOID:0000000009478196
WARNING:
Do not remove the radiator cap when the engine is hot. Serious burns could occur from high pressure
engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter
of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.
NOTE:
When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-
ing.
REMOVAL
1. Drain engine coolant from radiator. Refer to
CO-40, "Changing Engine Coolant"
.
CAUTION:
• Perform this step when engine is cold.
• Do not spill engine coolant on drive belts.
2. Remove the intake manifold collector. Refer to
EM-142, "Removal and Installation"
3. Remove engine coolant temperature sensor as necessary.
CAUTION:
Be careful not to damage engine coolant temperature sensor.
4. Remove water outlet, heater pipe, water bypass hoses and water pipe.
INSTALLATION
1.
Engine coolant temperature sensor
2.
Washer
3.
Water outlet
4.
Heater hose
5.
O-ring
6.
Water pipe
7.
Water hose
8.
Radiator hose (upper)
9.
Water hose
10. Water hose
11. Gasket
12. Heater pipe
13. Heater hose
14. Gasket
WBIA0615E
CO-58
< REMOVAL AND INSTALLATION >
[VQ40DE]
WATER OUTLET AND WATER PIPING
Installation is in the reverse order of removal, paying attention to the following.
• Securely insert each hose, and install clamp at a position where it does not interfere with the pipe bulge.
• Before inserting water pipe into water outlet, apply mild soap to O-ring.
CAUTION:
Do not reuse O-ring.
INSPECTION AFTER INSTALLATION
• Check for engine coolant leaks. Refer to
• Start and warm up engine. Visually check for engine coolant leaks. Repair as necessary.
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