NR Series COOLING RADIATOR ON-VEHICLE INSPECTION
CAUTION / NOTICE / HINT
- CAUTION:
-
-
Do not remove the reserve tank cap and air release valve while the engine and radiator assembly are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.
PROCEDURE
16475A
1.INSPECT RESERVE TANK CAP
- CAUTION:
-
Do not remove the reserve tank cap and air release valve while the engine and radiator assembly are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.
| *a | O-ring |
| *b | Rubber Packing |
Measure the valve opening pressure.
If there are water stains or foreign matter on the O-ring, clean it with water and finger scouring.
Check that the O-ring is not deformed, cracked or swollen.
Apply engine coolant to the O-ring and rubber packing before using a radiator cap tester.
Install a radiator cap tester to the reserve tank cap.
| *1 | Reserve Tank Cap |
| *a | Radiator Cap Tester |
| *b | 30° or more |
When using the radiator cap tester, tilt it upwards 30° or more.
Pump the radiator cap tester several times, and check the maximum pressure.
- Pump Speed:
1 pump per second
- Result:
Item Specified Condition Standard pressure
(for brand-new reserve tank cap)93 to 123 kPa (0.9 to 1.3 kgf/cm2, 13.5 to 18.0 psi) Minimum pressure
(for used reserve tank cap)79 kPa (0.8 kgf/cm2, 11.5 psi)
- HINT:
-
Even if the reserve tank cap cannot maintain the maximum pressure, it is not a defect.
If the maximum pressure is less than the minimum pressure, replace the reserve tank cap.
Remove the radiator cap tester from the reserve tank cap.
2.CHECK RADIATOR ASSEMBLY FOR CLOGGING
- CAUTION:
-
To prevent burns, do not touch the engine or other high temperature components while the engine is hot.
Remove the fan with motor assembly.
Shine an electric light at the radiator assembly and cooler condenser assembly from the front of the cooler condenser assembly and check the radiator assembly for clogging using a mirror.
| *a | OK | *b | NG |
| *c | Electric Light | *d | Mirror |
- OK:
The radiator assembly is not clogged.
If the radiator assembly is clogged, clean it.
Install the fan with motor assembly.
3.CLEAN RADIATOR ASSEMBLY
- CAUTION:
-
To prevent burns, do not touch the engine or other high temperature components while the engine is hot.
Remove the fan with motor assembly.
Cover the opening of each air duct with a piece of cloth.
Clean the cooler condenser assembly.
Check that the washer nozzle is not clogged.
Insert the washer nozzle into the space in front of the cooler condenser assembly and spray it.
- NOTICE:
- ·
Clean the fins of the cooler condenser assembly by spraying the entire area for 150 seconds. Repeat this process twice.
·Set the air pressure to 0.4 MPa (4.1 kgf/cm2, 58 psi).
·Check that water sprays in mist form from the nozzle.
·Keep the nozzle parallel to the cooler condenser assembly.
·Do not allow the nozzle to contact the fins of the cooler condenser assembly.
·Keep the nozzle moving while spraying water.
·Do not spray the cooler compressor assembly or generator assembly excessively.
Leave the cooler condenser assembly as is for 10 minutes to let the water penetrate the dirt.
Clean the cooler condenser assembly again.
- NOTICE:
- ·
Clean the fins of the cooler condenser assembly by spraying the entire area for 150 seconds. Repeat this process 4 times.
·Set the air pressure to 0.4 MPa (4.1 kgf/cm2, 58 psi).
·Check that water sprays in mist form from the nozzle.
·Keep the nozzle parallel to the cooler condenser assembly.
·Do not allow the nozzle to contact the fins of the cooler condenser assembly.
·Keep the nozzle moving while spraying water.
·Do not spray the cooler compressor assembly or generator assembly excessively.
Using an air blow gun, dry the cooler condenser assembly for 3 minutes.
Clean the radiator assembly.
Insert the washer nozzle into the space in rear of the radiator assembly and spray it.
- NOTICE:
- ·
Clean the fins of the radiator assembly by spraying the entire area for 150 seconds. Repeat this process twice.
·Set the air pressure to 0.4 MPa (4.1 kgf/cm2, 58 psi).
·Check that water sprays in mist form from the nozzle.
·Keep the nozzle parallel to the radiator assembly.
·Do not allow the nozzle to contact the fins of the radiator assembly.
·Keep the nozzle moving while spraying water.
Leave the radiator assembly as is for 10 minutes to let the water penetrate the dirt.
Clean the radiator assembly again.
- NOTICE:
- ·
Clean the fins of the radiator assembly by spraying the entire area for 150 seconds. Repeat this process 4 times.
·Set the air pressure to 0.4 MPa (4.1 kgf/cm2, 58 psi).
·Check that water sprays in mist form from the nozzle.
·Keep the nozzle parallel to the radiator assembly.
·Do not allow the nozzle to contact the fins of the radiator assembly.
·Keep the nozzle moving while spraying water.
Using an air blow gun, dry the radiator assembly for 3 minutes.
Check the fins of the radiator assembly for clogs again.
If the radiator assembly is clogged, clean the cooler condenser assembly and radiator assembly again.
Remove the piece of cloth from the opening of each air duct.
Install the fan with motor assembly.