Yanmar Lx410 Operator's Manual page 139

2. Flush the Cooling System
1. Fill the cooling system with water and common
flushing/cooling liquid.
• Follow the manufacturer's instructions.
2. Install and tighten the radiator cap.
3. Start and run the engine until the operating
temperature is reached.
! WARNING
Avoid injury!
● Touching hot surfaces can burn skin.
● If the engine has been running for some time,
the engine components are hot including all
internal fluids.
● Before performing maintenance or working
near the engine and engine parts:
• allow the engine to cool down
• always wear protective goggles and
protective clothing
4. Shut off the engine.
5. Remove the radiator petcock.
6. Place a drain pan underneath the engine coolant
drain plug.
7. Remove the engine coolant drain plug.
8. Immediately drain the flushing/cooling liquid.
• The preceding practice prevents rust and dirt
from settling down.
• Make sure to avoid touching and getting in
contact with hot engine components and hot
internal fluids.
9. Install the radiator petcock.
10.Install the engine coolant drain plug.
14-31_Petcock
(A) Radiator petcock
14. PERIODIC SERVICE
3. Fill the Cooling System
IMPORTANT
● Use correct coolant mixture to prevent damage
to the cooling system.
● Avoid operating the engine with plain water in the
cooling system.
● Always use a pre-diluted coolant, with an
antifreeze water mixture ratio that suits the local
climate.
● Allow the engine to cool down first before pouring
the coolant.
NOTE
When adding coolant to the cooling system:
● Use of High Quality Permanent Type Antifreeze
(Ethylene Glycol with corrosion and rust inhibitor
chemicals) is recommended.
● For the correct mixture ratio, read the
manufacturer's direction on the coolant
container.
1. Allow the radiator to cool down.
2. Fill the cooling system with approximately 5.1 qt.
(4.8 L) of coolant.
3. Install and tighten the radiator cap.
4. Start and run the engine until the operating
temperature is reached.
5. Shut off the engine.
6. Check the reserve tank coolant level.
7. Add coolant as necessary.
8. Lower the hood.
(A)
450140934
(A) Radiator cap
14-32
(A)
Lx410/450/490 Operator's Manual