NOTE : Another condition that can cause heat problems is the ignition timing. Retarded (late) timing causes the engine to send more heat to the cooling system. Advanced (early) timing causes the engine to send less heat to the cooling system.
Cooling System Recommendation Coolant Information The engine cooling system is provided with a mixture of 50% ethylene glycol anti-freeze and 50% water (For the vehicles of tropical area, the engine cooling system is provided with a mixture of 40% ethylene glycol anti-freeze and 60% water at the time of manufacture.) Since the cylinder head and water pump body are made of aluminum alloy casting, be sure to use a 30 to 60% ethylene glycol antifreeze coolant to assure corrosion protection and freezing prevention. Filling at over 20 liters per minute can cause air pockets in the cooling system.
After draining and refilling the cooling system, operate the engine with the radiator cap removed until the coolant reaches normal operatin temperature and the coolant level stabilizes. Add coolant as necessary to fill the system to the proper level. Operate with a thermostat in the cooling system all year-round. Cooling system problems can arise without a thermostat. Coolant Water Hard water, or water with high levels of calcium and magnesium ions, encourages the formation of insoluble chemical compounds by combining with cooling system additives such as silicates and phosphates.
The tendency of silicates and phosphates to precipitate out-of-solution increases with increasing water hardness. Hard water, or water with high levels of calcium and magnesium ions encourages the formation of insoluble chemicals, especially after a number of heating and cooling cycles. DOOSAN prefers the use of distilled water or deionized water to reduce the potential and severity of chemical insolubility. W ARN I N G If the concentration of the antifreeze is below 30%, the anticorrosion property will be adversely affected. In addition, if the concentration is above 60%, both the antifreeze and engine cooling properties will decrease, adversely affecting the engine.
For these reasons, be sure to maintain the concentration level within the specified range. To prevent damage to your engine, never add coolant to an overheated engine. Allow the engine to cool first. If the lift truck is to be stored in, or shipped to, an area with freezing temperatures, the cooling system must be protected to the lowest expected outside (ambient) temperature. The engine cooling system is protected with a commercially available automotive antifreeze, when shipped from the factory. Check the specific gravity of the coolant solution frequently in cold weather to ensure adequate protection.
Clean the cooling system if it is contaminated, if the engine overheats or if foaming is observed in the radiator. Old coolant should be drained, system cleaned and new coolant added as recommended with the commercially available automotive antifreeze. ppm = parts per million Using water that meets the minimum acceptable water requirement may not prevent drop-out of these chemical compounds totally, but should minimize the rate to acceptable levels. Antifreeze DOOSAN recommends selecting automotive antifreeze suitable for gasoline engines using aluminum alloy parts. The antifreeze should meet ASTM-D3306 standard. G643 (E) Service Manual Chapter 3.
Engine Mechanical System 55 Acceptable Water Water Content Limits (ppm) Chlorides (CI) 40 maximum Sulfates (SO4) 50 maximum Total Hardness 80mg/ℓ maximum Total Solids 250 maximum pH 6.0 ~ 8.0