MAINTENANCE COURSE
NTENANCE FOWA I MA
Coolant Handling
(Water)
FOWA stands for Fuel, Oil, Water and Air
HEN00020-00
Contents
1. Cooling circuit of an engine ........................................... 3 2. Example of rust, corrosion and erosion ............................. 4 3. Failure due to coolant pH .............................................. 5 4. Failure due to cavitation ............................................... 6 5. Failure due to scales ................................................... 7 6. Prevention of corrosion ................................................ 8 5 points to maintain cooling system Point 1 The best selection of coolant ................................... 10 Point 2 How to get and use of genuine coolant ....................... 11 Point 3 Check before starting engine ................................... 12 Point 4 Cleaning of radiator fins ........................................ 13 Point 5 Replacement interval ........................................... 14 Conclusion .................................................................. 15
Cooling circuit of an engine
Water temperature gauge Thermostat Radiator
Heat efficiency Cooling condition is important Approx. Energy Approx.
Heat released Engine with coolant output of fuel 100%
Cylinder head
30%
38%
Exhaust gas Approx. 32%
Water pump Cooling fan
Cylinder liner Piston Cylinder block Oil cooler
Example of rust, corrosion and erosion
Erosion of a thermostat housing
Rust and Corrosion
Cylinder liner
Failure due to coolant pH
Komatsu Supercoolant AF-NAC Water + Corrosion resister Iron
Cross-section of radiator core tube
Portion corroded from inside by coolant
Corrosion of aluminum radiator core tube
Copper (Brass)
Aluminum 1 2 3 4 5 Acidity 6 7 8 9 10 Alkaline
Non-corrosion range 11 12 13
5
pH
4
Liner Bubble Block Piston Coolant
Failure due to cavitation
Compression
Cylinder liner
Combustion
ENGINE SEIZURE
Bubble burst Cavitation
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
Seizure of piston and cylinder liner
Clogged radiator tubes
Overheating
Piston
Cylinder liner
Prevention of corrosion
Metal corrosion tests (conforming to the JIS K2234 tests)
Komatsu Genuine SuperCoolant (coolnt:30%, artificial corrosive water:70%)
Komatsu Supercoolant AF-NAC prevents metal corrosion.
Cast aluminum Cast iron Steel Brass Solder Copper
Blended solution (artificial corrosive water)
Cast aluminum Cast iron
Steel
Brass
Solder
Copper
5 points
to maintain cooling system
Point 1
The best selection of coolant
Capability items LLC CR AF
10
Prevention of corrosion and rust on iron and brass Prevention of corrosion and rust for aluminum Prevention of cavitation and erosion Inhibition of scale deposit
Using Komatsu Supercoolant AF-NAC
Antifreeze
LLC : Long Life Coolant CR : Water + Corrosion Resister AF : Komatsu Supercoolant AF-NAC
: Excellent : Good : No effect
Corrosion resister is unnecessary
Point 2
How to get and use of genuine coolant
Purchase Komatsu genuine Supercoolant AF-NAC from Komatsu distributor. No need to add water when filling.
Komatsu distributor
Komatsu genuine Supercoolant AF-NAC 50/50 prediluted can be used at ambient temperatures from -30 to +50C.
11
Point 3
Check before starting engine
12
Before starting the engine each day Check for leakage of coolant around the engine. Check if the coolant in reserve tank is between the FULL and LOW marks. If the coolant level is low, add Komatsu genuine Supercoolant AF-NAC ONLY to the FULL level through the Filler port of reserve tank.
FULL
LOW
Filler port
Reserve tank
Do not open the radiator cap unnecessarily. When checking the coolant level, always wait for the engine to cool down and check the level in the reserve tank.
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.
13
Point 5
Replacement interval
2 years or
14
Coolant should be replaced once for every 2 years or 4000 hours whichever comes first.
Replacement interval 0h Replacement of Komatsu Supercoolant AF-NAC Life of Coolant Additives by Temperature
(based on Komatsu's in-house data comparison)
4000h Replacement of Komatsu Supercoolant AF-NAC
Temperature (C) Higher
Commercially available coolant Komatsu Genuie Supercoolant
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
Lower
4000 shorter
Life of coolant additives (hours)
Longer
Conclusion
Coolant must function to prevent corrosion and cavitation as well as freezing. Komatsu Genuine Supercoolant AF-NAC is excellent at preventing corrosion and cavitation, and has good antifreeze and cooling properties. It can be used for 2 years or 4000 hours without making replacement. Komatsu Genuine Supercoolant AF-NAC is strongly recommended for the cooling system.
15
www.Komatsu.com
HEN00020-00
Materials and specifications are subject to change without notice. is a trademark of Komatsu Ltd. Japan.
