3056 Engine for Caterpillar Built Machines Caterpillar

Remember that temperature and pressure work together. Both the temperature and the pressure must be checked when a problem with the cooling system exists. The pressure of the cooling system will have an effect on the temperature of the cooling system. Review Illustration 1 in order to determine the following effects on the boiling point of water:

• Pressure

• Height above sea level

Illustration 1	g00313203
Cooling system pressure at specific altitudes and boiling points of water

Test Tools For The Cooling System

Table 1

Required Tools
Part Number	Part Name	Quantity
4C-6500	Digital Thermometer	1
8T-2700	Blowby/Air Flow Indicator	1
9U-7400	Multitach Tool Group	1
9S-8140	Pressurizing Pump	1

Illustration 2	g00313246
4C-6500 Digital Thermometer

The 4C-6500 Digital Thermometer is used in the diagnosis of problems that cause overheating or overcooling in the engine. This tool can be used to check the temperature in several areas of the cooling system. The testing procedure is in Tool Operating Manual, NEHS0554.

Illustration 3	g00313263
8T-2700 Blowby/Air Flow Indicator

The 8T-2700 Blowby/Air Flow Indicator is used to check the air flow through the radiator core. The operating instructions are included with the tooling.

Illustration 4	g00022794
9U-7400 Multitach Tool Group

The 9U-7400 Multitach Tool Group is used to measure the fan rpm. The testing procedure is in Tool Operating Manual, NEHS0605.

Adding The Antifreeze

Do not add pure antifreeze to the cooling system in order to adjust the concentration of antifreeze. The pure antifreeze increases the concentration of antifreeze in the cooling system. The increased concentration increases the concentration of dissolved solids and undissolved chemical inhibitors in the cooling system.

Add an antifreeze and water mixture in the concentration which provides the desired freeze protection. Use the following chart in order to determine the correct concentration of antifreeze in water to use.

Table 2

Antifreeze Concentrations For Freeze Protection
Temperature	Concentration
-15°C (5°F)	30% antifreeze and 70% water
-23°C (-9°F)	40% antifreeze and 60% water
-37°C (-35°F)	50% antifreeze and 50% water
-51°C (-60°F)	60% antifreeze and 40% water

Testing The Pressure Cap

One cause for a pressure loss in the cooling system can be a faulty seal on the radiator pressure cap.

Illustration 5	g00313363
9S-8140 Pressurizing Pump (1) Release valve (2) Adapter (3) Hose

The 9S-8140 Pressurizing Pump pressurizes the cooling system in order to test for leaks.

Illustration 6	g00313383
Pressure cap that is mounted on the radiator (4) Sealing surface between the pressure cap and the radiator

Use the following procedures to inspect the pressure cap and test the pressure cap.

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Pressurized system: Hot coolant can cause serious burn. To open cap, stop engine, wait until radiator is cool. Then loosen cap slowly to relieve the pressure.

1. When the engine has cooled, loosen the pressure cap to the first stop. Remove the pressure cap when the pressure is released from the cooling system.

2. Inspect the pressure cap carefully. Look for damage to the seal. Look for damage to the surface that seals. Remove any debris on the cap, the seal, or the sealing surface.

3. Put the pressure cap on the 9S-8140 Pressurizing Pump .

4. Observe the exact pressure when the pressure cap opens.

5. Compare the pressure to the pressure rating that is found on the top of the pressure cap. The pressure cap is faulty if the pressure cap opens at a pressure beyond the range that is found on the pressure cap. Replace a faulty pressure cap with a new part.

Testing The Radiator And Cooling System For Leaks

Use the following procedure to test the radiator and the cooling system for leaks.

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Pressurized system: Hot coolant can cause serious burn. To open cap, stop engine, wait until radiator is cool. Then loosen cap slowly to relieve the pressure.

1. When the engine has cooled, loosen the pressure cap to the first stop. Allow the pressure to release from the cooling system. Then remove the pressure cap.

2. Make sure that the coolant covers the top of the radiator core.

3. Put the 9S-8140 Pressurizing Pump on the radiator.

4. Use the pressurizing pump to increase the pressure to an amount of 20 kPa (3 psi) more than the operating pressure of the pressure cap.

5. Inspect the radiator for leakage.

6. Inspect all connections and hoses of the cooling system for leaks.

   The radiator and the cooling system do not have leakage if all of the following conditions exist:

   • You do not see any leakage after five minutes.

   • The dial indicator remains constant beyond five minutes.

   • The reading on the dial indicator decreases, and you do not observe any outside leaks.

7. If any leakage exists on the inside of the cooling system, identify the location of the leakage. Repair the source of the leak in the cooling system.

Testing The Water Temperature Regulator

1. Remove the water temperature regulator from the engine.

2. Hang the water temperature regulator in a pan of water. Put a thermometer in the water. Put the water temperature regulator completely under water. Do not allow the water temperature regulator to be in contact with the pan.

3. Heat the water in a container. Stir the water in order to keep all of the water at the same temperature.

4. Replace the water temperature regulator if the water temperature regulator does not open at the temperatures that are found in Specifications, "Water Temperature Regulator".