Post on 21-Apr-2015
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MAINTENANCE FOWA
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MAINTENANCE COURSE
Coolant HandlingMAINTENANCE FOWA
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(Water)
1. Cooling circuit of an engine ........................................... 32. Example of rust, corrosion and erosion ............................. 43. Failure due to coolant pH .............................................. 54. Failure due to cavitation ............................................... 65. Failure due to scales ................................................... 76. Prevention of corrosion ................................................ 85 points to maintain cooling systemPoint 1 The best selection of coolant ................................... 10Point 2 How to get and use of genuine coolant ....................... 11Point 3 Check before starting engine ................................... 12Point 4 Cleaning of radiator fins ........................................ 13Point 5 Replacement interval ........................................... 14Conclusion .................................................................. 15
Contents
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Cooling condition is important
Heat efficiency
Engineoutput
Approx. 38%
Energyof fuel100%
Exhaust gas Approx. 32%
Heat released
with coolant
Approx.30%
1 Cooling circuit of an engine
42 Example of rust, corrosion and erosion
Rust and Corrosion Erosion of a thermostat housing
Cylinder liner
5
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Corrosion of aluminum radiator core tube
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3 Failure due to coolant pH
64 Failure due to cavitation
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ENGINESEIZURE
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5 Failure due to scales
Scales deposit• In the radiator tubes• On the oil cooler tubes• On the cylinder liners• In the cylinder heads• In the thermostat
Clogged radiator tubesOverheating
Piston
Cylinder liner
Seizure of piston and cylinder liner
86 Prevention of corrosion
Metal corrosion tests (conforming to the JIS K2234 tests)
•Komatsu Genuine SuperCoolant (coolnt:30%, artificial corrosive water:70%)
Cast aluminum Cast iron Steel Brass Solder Copper
•Blended solution (artificial corrosive water)
Cast aluminum Cast iron Steel Brass Solder Copper
KomatsuSupercoolant
AF-NAC preventsmetal corrosion.
5 pointsto maintain cooling system
10Point 1 The best selection of coolant
Capability items
Prevention of corrosion and rust on iron and brass
Prevention of corrosion andrust for aluminum
Prevention of cavitation and erosion
Inhibition of scale deposit
Antifreeze
1
2
3
4
5
LLC CR AF
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Using KomatsuSupercoolant
AF-NAC
Corrosionresister is
unnecessary
11
Point 2 How to get and use of genuine coolant
Purchase Komatsu genuine SupercoolantAF-NAC from Komatsu distributor.No need to add water when filling.
Komatsu genuineSupercoolantAF-NAC 50/50 pre-diluted can beused at ambienttemperaturesfrom -30 to +50˚C.
Komatsu distributor
12Point 3 Check before starting engine
Do not open the radiator cap unnecessarily. When checking the coolant level, always waitfor the engine to cool down and check the level in the reserve tank.
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Before starting the engine each day
Check for leakage of coolant aroundthe engine.
Check if the coolant in reserve tank isbetween the FULL and LOW marks.If the coolant level is low, addKomatsu genuine SupercoolantAF-NAC ONLY to the FULL levelthrough the Filler port of reserve tank.
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Point 4 Cleaning of radiator fins
Clean radiator fins periodically
• If radiator fins are clogged, the engine may overheat and seize in the worst case.• Therefore periodical cleaning of radiator fins is recommended.
14Point 5 Replacement interval
Coolant should be replaced once for every 2 years or 4000 hours whichever comes first.
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2 years or
To keep the coolant temperature at the proper level while operating the machine;
Coolant leakage check (Point 3)Coolant level check (Point 3)Cleaning of radiator fins (Point 4)Fan belt check
Replacement interval
Replacement ofKomatsu Supercoolant AF-NAC
Replacement ofKomatsu Supercoolant AF-NAC
0h
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4000h
Komatsu GenuieSupercoolant
Commerciallyavailable coolant
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Conclusion
Coolant must function to prevent corrosion andcavitation as well as freezing.
Komatsu Genuine Supercoolant AF-NAC isexcellent at preventing corrosion and cavitation,and has good antifreeze and cooling properties.It can be used for 2 years or 4000 hours withoutmaking replacement.
Komatsu Genuine Supercoolant AF-NAC isstrongly recommended for the cooling system.
www.Komatsu.com
HEN00020-00 Materials and specifications are subject to change without notice.is a trademark of Komatsu Ltd. Japan.