Required special tool
- MS 554-01 Adapter for MS 554-05.
- MS 554-06 Adapter for MS 554-05.
- MS 554-07 Cooling system leak test kit.
1. Replace expansion tank valve with adapter MS 554-01.
2. Connect the MS 554-07 instrument to it.
3. Warm up the engine, then stop it.
4. Operate the pump to pressurize the system.
5. Stop pumping as soon as the pressure is 0.1 bar below the control pressure set on the valve.
6. The pressure must not drop, otherwise look for a leak.
7. Gradually unscrew the fitting of the MS 554-07 to relieve pressure in the cooling system, then remove the MS 554-01 adapter and replace the expansion tank valve with a new gasket under it.
8. If the fluid flows freely through the bottle valve (Brown), then it should be replaced. Screw the adapter MS 554-06 onto the MS 554-07 and install the valve to be tested on it. By pumping, increase the pressure, it should stabilize at the calibration pressure level of 1.2±0.1 bar.
Pic. 1.14