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Flushing a Contaminated Cooling System Exhaust System
To fill the cooling system:
1. After the cooling system is completely flushed. Refill with coolant to the specification in Section 1. 2. Start the engine with the relief cap on the header tank removed. Allow the coolant to warm, the thermostat to open and the coolant level stabilise. 3. Check the coolant level. Add coolant mixture if necessary to bring the coolant to the correct level. 4. Refit header tank relief cap. 5. Start the engine and check any coolant leaking at the operational temperature.
The use of water containing minerals will form scale and silt deposits within the cooling system resulting in decreased cooling system efficiency and possible engine overheating. Scale formation must be chemically removed using a reputable descaling solvent. Thoroughly follow the mixing and neutralising directions on the descaling solvent container. The thermostats must be removed from the engine when descaling solvent is used.
FLUSHING A CONTAMINATED COOLING SYSTEM
If the cooling system becomes contaminated it should be thoroughly flushed before the engine becomes contaminated. One possible cause is with a cracked oil cooler, oil will be forced into the cooling system.
To flush the cooling system:
1. Ensure the source of contamination has been rectified. 2. Prepare a mixture of Calgon, or equivalent, at a ratio of 300 grams (dry) to 20 litres of water. 3. Remove the engine thermostat as previously described. 4. Fill the engine with Calgon solution and run for five minutes. 5. Drain the system and repeat the Calgon solution. 6. Drain the system again and fill with clean, demineralised water. 7. Run the engine for five minutes and drain completely. 8. Install the thermostat and refill the system with coolant to the specification in Section 1.
