Check Leaks Between Cooling System and Combustion Chamber

Warning:
Danger of scalding
Only perform this work after engine has cooled down.

Caution:
When engine is running with cooling system depressurized, this can create steam bubbles.
These cause the engine to overheat.
Observe coolant temperature.

Carry out test with CO leak tester for cylinder head leak test in accordance with operating instructions of equipment manufacturer.





In the event of a leak, the color of the test liquid turns yellow by the carbon dioxide (combustion gas) entering the cooling system.


Transparent expansion tank





Allow engine to cool down before checking coolant level. Coolant temperature must not exceed 30°C. If ambient temperature exceeds 30°C, allow engine to cool down at least to ambient temperature.
Check coolant level, top up coolant if necessary until fluid level is in line with marking on expansion tank.

Note: The tank mark indicates the fluid level at approx. 20°C.

Use only recommended coolant.

Black expansion tank





Allow engine to cool down before checking coolant level. Coolant temperature must not exceed 30°C. If ambient temperature exceeds 30°C, allow engine to cool down at least to ambient temperature.

Check coolant level, top up coolant if necessary until fluid level is in line with marking on expansion tank.

Note: The tank mark indicates the fluid level at approx. 20°C.

Use only recommended coolant.