D330, D333, D334, D336 INDUSTRIAL & MARINE ENGINE Caterpillar

Cooling System

Usage:

Engine Jacket Water

Checking Coolant Level

With the engine warm and stopped:

1. Slowly loosen the filler cap and release pressure.

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Be careful; steam may spray. Avoid being burned.

2. Push downward and turn the cap until it is released.

3. Maintain coolant level to within 1/2 inch (1 cm) below bottom of fill pipe. The coolant will expand as it is heated.

4. Make-up coolant must be one of the following:

a. Permanent anti-freeze and water solution.

b. Drinkable water and rust inhibitor solution.

For emergencies, and only as a "temporary fix" until the cooling system can be returned to either (a) or (b), use either:

c. Drinkable water.

d. Any available water.

"Drinkable water" is clean water that is low in scale forming minerals-not softened water. Never add coolant to an overheated engine. Allow it to cool first.

Check specific gravity of anti-freeze solution frequently in cold weather to assure adequate protection.

Draining Complete Cooling System

Whenever it is necessary to drain the cooling system for repairs:

1. Remove the filler cap.

2. Open the drain valve for the radiator or expansion tank.

3. Remove both engine block drain plugs; and drain the coolant.

4. Install the drain plugs and close the radiator or expansion tank drain before filling the cooling system.

Flushing Cooling System

To clean the cooling system, any good commercial radiator cleaning solution can be used. Follow the instructions included with the cleaner.

The cooling system can be cleaned using oxalic acid and sodium carbonate as follows:

1. Fill the cooling system with a solution consisting of two pounds of oxalic acid or sodium bisulphate (NaHSO₄) with every 10 gallons of water (mix 0,24 kg with every 10 liters of water).

2. Start the engine and operate at operating temperatures for 1/2 to 1 hour.

3. Stop the engine and drain the cooling system.

4. Flush the system with clean water until the draining water is clear.

5. Install all drain plugs.

6. Fill with a solution consisting of 1/2 pound of sodium carbonate crystals (Na₂CO₃O) with every 10 gallons of water (mix 0,06 kg with every 10 liters of water).

7. Start and run the engine for 10 minutes.

8. Stop the engine and drain the cooling system.

9. Flush the cooling system with clean water.

10. Install all drain plugs.

Filling Cooling System

When filling a cooling system it is essential for the system to be filled completely and air pockets eliminated. This is even more important on Vee engines since the water flow is divided. Air trapped in the system can cause major engine failures. Follow the proper procedure when filling a cooling system.

1. Determine the highest point in the engine portion of the cooling system.

2. Remove a plug or loosen a line as close to this point as possible.

3. Fill the cooling system until a solid stream of coolant comes from the opening. (Stop the filling procedure several times to allow the level to stabilize.) Use water that is low in scale forming minerals, not softened water.

4. Install the plug and fill the system to the proper level.

5. Start the engine and allow it to idle several minutes. Add coolant as necessary.

Raw Water

Salt water has a highly corrosive reaction with metal by a chemical action called "electrolysis". To prevent this chemical action taking place, with parts used in the raw water system, zinc plugs are placed in the raw water piping. Zinc is a relatively soft metal which reacts quite readily with the salt water. Thus, by the deterioration of the zinc, the raw water system parts are protected from corrosion.

The zinc rods must be inspected regularly and be replaced as they become deteriorated. The zinc rod plugs are painted red for easy identification.