Maintenance Section
-131-
Cooling System Specifications
Coolant Information
NOTE:
The following information is generic and
valid for lift trucks.
Engine operating temperatures have increased to
improve engine efficiency. This means proper
cooling system maintenance is especially important.
Overheating, overcooling, pitting, cavitation erosion,
cracked heads, piston seizures, and plugged
radiators are classic cooling system failures. In fact,
coolant is as important as the quality of fuel and
lubricating oil.
NOTICE
DAEWOO recommends that the coolant mixture
contain 50% commercially available automotive
antifreeze, and 50% water.
The coolant mix with concentration of antifreeze
smaller than 30% does not provide sufficient
corrosion protection. Concentrations over 60%
adversely affect freeze protection and heat transfer
rates.
Never add coolant to an overheated engine, engine
damage can result. Allow the engine to cool first.
If the machine 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 normally protected to
-28
°C
(-20
°F
) with antifreeze, when shipped from
the factory unless special requirements are defined.
Check the specific gravity of the coolant solution
frequently in cold weather to ensure adequate
protection.
Clean the cooling system if it is contaminated, the
engine overheats or foaming is observed in the
radiator.
Old coolant should be drained, the system cleaned
and new coolant added every 2000 service hours
or yearly.
Refer to topic, “Cooling System - Clean, Change” in
Every 2000 Service Hours or Yearly section.
Filling at over 20 liters (5 U.S. gallons) 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 operating
temperature and the coolant level stabilizes. Add
coolant as necessary to fill the system to the proper
level.
Never operate without a thermostat in the cooling
system. Cooling system problems can arise without
a thermostat.
