FLUSHING ACONTAMINATED COOLING SYSTEM

Blakefield South FBL-55H Service Manual

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.

WARNING Engine coolant fluid will be under pressure and hot. Always relieve pressure by lifting the relief lever on relief cap before removal. Wear personal protective equipment such as safety glasses, long sleeve shirt and gloves to avoid scalds and burns from hot coolant.