Engine Cooling System - Doosan DX700LC Operation And Maintenance Manual

ENGINE COOLING SYSTEM

General
Keeping an engine's cooling system in peak operating condition,
can have many benefits to keeping a machine in good operating
condition. A properly functioning cooling system will; improve
fuel efficiency, reduce engine wear, and extend component life.
Always use distilled water in the radiator. Contaminants in tap
water neutralize the corrosion inhibitor components. If tap water
must be used, it should not exceed 300 ppm hardness, or
contain more than 100 ppm of either chloride or sulfate. Water
that has been treated with a water softener also contains salt
that will cause corrosion of components. Water from creeks and
stagnant pools usually contains dirt, minerals and/or organic
material that are deposited in the cooling system and impair
cooling efficiency. Distilled water is the best.
Make at least a minimum mixture of 40% antifreeze with 60%
distilled water for adding additional fluid to the system during
normal maintenance. This level will help maintain the additive
concentration of the system. Check the coolant every 500 hours.
Engine overheating is often caused by bent or clogged radiator
fins. The spaces between the fins can be cleaned by use of air
or water under pressure. When straightening bent fins, use care
not to damage the tubes or break the bond between the fins and
the tubes.
Maintaining the proper anticorrosive additive levels in
antifreeze will help
components from becoming corroded.
If anticorrosive additive levels are not properly maintained
and monitored, server damage to the cooling pump and
cylinder liners may result. This corrosion can also result in
the radiator tubes becoming clogged and loosing their heat
transfer efficiency. The engine (Model: DV11) uses a
wet-type cylinder liner design, which requires, a high
efficiency cooling system flow, to maintain proper engine
temperatures.
The coolant and its additives can be checked by using
coolant test paper (No: 60.99901-0038).
Pressure at air nozzle must not exceed 2.1 kg/cm
psi). Always wear goggles when using compressed air.
Do not pour cold water into radiator when engine is very
hot and water level is below the top of the tubes. Such
action could result in damage to engine cylinder heads.
Inspection, Maintenance and Adjustment
CAUTION
protect the engine
WARNING
and other
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