MAINTENANCE, LUBRICATION AND SERVICE
COOLING SYSTEM
The main purpose of coolant is to
transport heat from the hot parts of the
engine to the radiator and to protect the
cooling system from corrosion.
In addition to this, the coolant must:
• Protect against pitting and cavitation
erosion damage of the water pump and
cylinder liners.
• Protect against freezing and boiling.
• Prevent formation of scale, sludge
deposits and clogging.
• Be harmless to polymer materials and
seals in the cooling system.
• Maintain its liquid properties in cold
climates.
Many engine failures can be traced back
to a problem in the cooling system. If the
coolant level is allowed to go below the
bottom of the tank, there is the risk of
the engine shutting down. See the
operators manual for more information
on the warning functions.
NOTE
Always dispose of coolant according to
Federal and local regulations. Take all
used coolant to a recycling or waste
collection center.
Coolant mixture consisting of an
antifreeze solution in water should be
used year-round to provide freeze and
boil-over protection.
NOTE
DO NOT use antifreeze formulated for
automobile gasoline engines. These have
a very high silicate content that will clog
the radiator and leave unwanted deposits
in the engine.
Coolant System Capacities
CAUTION
Capacities may vary due to hoses and
size of radiator, as well as accessory
cooling equipment. After running the
engine until normal operating temperature
is reached, check the coolant level and
add coolant as needed.
Use the chart shown in conjunction with
the Ethylene-Glycol and Propylene-
Glycol Protection Charts in this section
to determine the amount of antifreeze
needed to protect your vehicle.
Coolant Capacity GU With MP7™
Chassis
Model
Engine
Model
Coolant
Capacities in
Liters (Quarts)
GU
MP7
™
52 (55
Coolant capacity listed is for chassis
equipped with manual transmission. For
automatic transmission add 9.5 liters (10
qts.)
Use the following antifreeze protection
charts to determine the percentage of
antifreeze needed to achieve specic
protection levels for various coolant
systems.
Ethylene-Glycol Protection Chart
Ethylene
Glycol
Ambient Air Temperature
40% -24ºC (-12ºF)
50% -37ºC (-34ºF)
60% -52ºC (-62ºF)
Propylene-Glycol Protection
Chart
Propylene-
Glycol
Ambient Air Temperature
40% -21ºC (-6ºF)
50% -33°C (-27°F)
60% -49°C (-56°F)
A well functioning and maintained
cooling system is as important to the
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X Publication_PC28
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