Coolant Komatsu

MAINTENANCE COURSE

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Coolant Handling (Water)

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 engine Heat efficiency Heat released with coolant

Engine output

Cooling condition is important Approx. Energy Approx. 30%

of fuel 100%

Exhaust gas Approx. 32%

38%

2

Example of rust, corrosion and erosion

Rust and Corrosion

Erosion of a thermostat housing

Cylinder liner

4

3

Failure due to coolant pH

Corrosion of aluminum radiator core tube

pH

4

Failure due to cavitation

6

ENGINE SEIZURE

5

Failure due to scales

Scalesdeposit • In the radiator tubes • On the oil cooler tubes • On the cylinder liners • In the cylinder heads • In the thermostat

Clogged radiator tubes

Seizure of piston and cylinder liner

Overheating Piston

Cylinder liner

6

Prevention of corrosion

Metal corrosion tests

8

(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

Solder

Copper

•Blended solution (artificial corrosive water)

Cast aluminum

Cast iron

Steel

Brass

5 points to maintain cooling system

Point 1

The best selection of coolant Capability items

1

Prevention of corrosion and rust on iron and brass

2

Prevention of corrosion and rust for aluminum

3

Prevention of cavitation and erosion

4

Inhibition of scale deposit

5

Antifreeze

LLC CR AF

LLC

CR

10

AF

Using Komatsu Supercoolant AF-NAC

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 +50 C. ˚

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.

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.

Point 5

Replacement interval

14

Coolant should be replaced once for every 2 years or 4000 hours whichever comes first. 2 years or Replacement interval

0h

4000h

Replacement of Komatsu Supercoolant AF-NAC

Replacement of Komatsu Supercoolant AF-NAC

Life of Coolant Additives by Temperature 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 

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.

www.Komatsu.com

HEN00020-00

Materials and specifications are subject to change without notice. is a trademark of Komatsu Ltd. Japan.