24. SERVICE PROCEDURE 24.2.2 CLEAN INSIDE OF COOLING SYSTEM ¤ WARNING Soon after the engine has been stopped, the coolant is hot and can cause personal injury. Allow the engine to cool before draining water. Since cleaning is performed while the engine is running, it is very dangerous to enter the rear side of the machine as the machine may suddenly start moving. If the under cover is left removed, it may interfere with the fan. While the engine is running, never enter the rear side of the machine. Never remove the radiator cap when the engine is at operat- ing temperature. At operating temperature, the coolant is under pressure.
Steam blowing up from the radiator could cause personal injury. Allow the engine to cool until the radiator filler cap is cool enough to touch with your hand. Remove the filler cap slowly to allow pressure to be relieved. Clean the inside of the cooling system change the coolant and replace the corrosion resistor according to the table below. Stop the machine on level ground when cleaning or changing the coolant. Use a permanent type of antifreeze. If, for some reason, it is impossible to use permanent type antifreeze, use an antifreeze containing ethylene glycol. Super Coolant (AF-ACL) has an anti-corrosion effect as well as an antifreeze effect.
The ratio of antifreeze to water depends on the ambient tempera- ture, but to obtain the corrosion resistance effect, a minimum ratio of 30% by volume is necessary. 3-26 Kind of coolant Cleaning inside of cooling system and changing coolant Replacing corrosion resistor Permanent type antifreeze (All season type) Every year (autumn) or every 2000 hours whichever comes first Every 1000 hours and when cleaning the in- side of the cooling system and when changing coolant.
Non permanent type antifreeze containing ethylene glycol (Winter, one season type) Every 6 months (spring, autumn) (Drain antifreeze in spring, add antifreeze in autumn) When not using antifreeze Every 6 months or every 1000 hours whichever comes first