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MAINTENANCE COURSE

NTENANCE FOWA I MA

Coolant Handling(Water)FOWA stands for Fuel, Oil, Water and AirHEN00020-00

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

1

Cooling circuit of an engineWater temperature gauge Thermostat RadiatorHeat 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

3

2

Example of rust, corrosion and erosionErosion of a thermostat housing

4

Rust and Corrosion

Cylinder liner

3

Failure due to coolant pHKomatsu 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 12 135

pH

4Liner Bubble Block Piston Coolant

Failure due to cavitationCompression

6

Cylinder liner

Combustion

ENGINE SEIZURE

Bubble burst Cavitation

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

Seizure of piston and cylinder liner

Clogged radiator tubes

OverheatingPiston

Cylinder liner

7

6

Prevention of corrosion

8

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 pointsto maintain cooling system

Point 1

The best selection of coolantCapability items LLC CR AF

10

1

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

2

3

Using Komatsu Supercoolant AF-NAC

4

5

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 coolantPurchase 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 interval2 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.