Attention: on a hot engine, this operation must be carried out with care to avoid burns from hot water jets or steam.
2. Check the radiator cap using a radiator tester.
Note:
- If there are traces of liquid and / or foreign deposits on the cap, rinse and blow the cap.
- When performing the tests below, it is necessary to hold the radiator tester mounted on the radiator cap at an angle of at least 30°from the horizontal, as shown in the figure.
By moving the tester piston evenly and slowly (1 tester piston stroke in 3 seconds or more) pressurize the steam valve of the radiator cap and check that the valve opens with air pressure.
Otherwise, replace the radiator cap.
Valve opening pressure:
- KZ series - 0.95-1.25 bar
- EJ series - 0.75 - 1.05 bar
If the valve opening pressure is less than the minimum, replace the radiator cap.
3. Check the cooling system for leaks.
A) Fill the system with coolant and connect the tester with a hose to the radiator neck as shown.
Series K3
EJ-series
b) Warm up the engine.
V) Using a tester, pressurize the system to 1.2 bar and check that the pressure does not drop.
If pressure drops, check hoses, radiator and pump for leaks.
If no leaks are found, check the condition of the radiator core, cylinder block and head.
4. Install the radiator cap.