Service manual

Cooling System 12
87
 Sealing performance of the cooling system
1. Change the water tank cover with a specific water tank cover for leakage tests.
2. Connect a specific air pump with a pressure gauge attached.
3. Pump air into the tank until the pressure reaches 1.1 kg/cm
2
; repeatedly pump air up to 1.1 kg/cm
2
after
reducing the pressure for several seconds.
4. No pressure drop is indicated on the gauge within one minute; if any, check each connector of the
cooling hoses for any leakage.
 Check the water tank cover
1. Connect the water tank onto the connector of the leakage tester.
2. Connect the specific air pump for pressure tests.
3. Standard rated pressure: 1.1 kg/cm
2
. The pressure drop should be within the range of rated pressures for
the pressure cap.
4. Check the pressure drop within the standard range, or change the pressure cap for the pressure drop
beyond 0.1 kg/cm
2
from the standard value.
※ The purpose of the pressure cap is to increase the boiling point of water coolant with the minimum water
coolant evaporated. The coolant water with pressure inside the water tank lifted beyond the rated pressure
of the pressure cap will be directed into the auxiliary water tank for pressure relief.
※
Pressure high: Coolant water inside the
tank directed to the auxiliary tank.
※
Pressure low: Water coolant inside the
auxiliary tank drawn to the water tank.