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8.12 Engine Cooling System Maintenance
The
210 DUS Air
Compressor's engine has a pressurized cooling system that contains a 50/50 mixture
of water and ethylene glycol. Maintenance of the system includes the engine coolant, belt tension, fan
integrity, and radiator. Further cooling system maintenance is defined in the engine manual.
I.
Engine Coolant
A. Specifications
This diesel engine requires a balanced coolant mixture of water and ethylene glycol base
antifreeze. This protects the engine cooling system from corrosion as well as freezing damage.
The 210 DUS Air Compressor is shipped from the factory with a 50/50 mixture of water and
ethylene glycol. In tropical climates where freeze protection is not required, glycol engine
coolant should still be used to help prevent corrosion and pitting of cylinder liners.
B. Mixtures
Antifreeze concentration level should not exceed recommended levels. To do so can cause
cooling system failure.
1. A mixture of 50% antifreeze and 50% water is required for temperatures above -34° F.
2. A mixture of 60% antifreeze and 40% water is required for temperatures below -34° F.
This provides protection to -65° F.
3. Never exceed a 60% overall antifreeze mix.
C. Coolant Level
Before each start-up, when radiator is cold, the coolant level should be checked. When
needed, refill with a 50/50 solution of water and ethylene glycol, DO NOT use 100% anti-
freeze. The proper level for coolant in the system is to the bottom of the radiator fill neck and to
the cold line of the recovery bottle.
II.
Engine Radiator
A. Radiator Core
Any sign of leakage from the engine radiator may justify a pressure test to assure its integrity.
Radiator leaks should only be repaired by qualified service technicians. Dirt that clogs the
cooling fins of the radiator should be removed. The use of an air stream or high-pressure steam
cleaner should be done with caution so as to not damage the delicate fins. Bent cooling fins will
reduce the cooling capability of the radiator.
Maintenance
Check the coolant level only when the engine is stopped and
the temperature is below 160° F. Failure to do so can cause
personal injury from heated coolant spray.
34
309416
01/31/2012
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