Operation and maintenance manual

QSB4.5 and QSB6.7 Cooling System
Section 7 - Maintenance Procedures at 2000 Hours or 2 Years Page 7-5
CAUTION
Do not install the radiator cap. The engine is to be
operated without the cap for this process.
Fill the system with a mixture of sodium carbonate and
water (or a commercially available equivalent).
NOTE: Adequate venting is provided for a fill rate of 19
liters [5 gal.] per minute.
WARNING
Coolant is toxic. Keep away from children and pets.
Dispose of in accordance with local environmental
regulations.
Operate the engine for 5 minutes with the coolant
temperature above 80°C [176°F].
Shut the engine off, and drain the cooling system.
Fill the cooling system with clean water.
NOTE: Do not install the radiator cap.
Operate the engine for 5 minutes with the coolant
temperature above 80°C [176°F].
Shut the engine off, and drain the cooling system.
NOTE: If the water being drained is still dirty, the system
must be flushed again until the water is clean.