SPRING 2P5751 - Caterpillar

This engine has a pressure type cooling system. A pressure type cooling system gives two advantages:
The pressure type cooling system can operate safely at a higher temperature than the boiling point of water at a range of atmospheric pressures.
The pressure type cooling system prevents cavitation in the water pump.Cavitation is the sudden generation of low pressure bubbles in liquids by mechanical forces. The generation of an air or steam pocket is much more difficult in a pressure type cooling system.Regular inspections of the cooling system should be made in order to identify problems before damage can occur. Visually inspect the cooling system before tests are made with the test equipment. Visual Inspection Of The Cooling System
Check the coolant level in the cooling system.
Look for leaks in the system.
Inspect the radiator for bent fins and other restriction to the flow of air through the radiator.
Inspect the drive belt for the fan.
Inspect the blades of the fan for damage.
Look for air or combustion gas in the cooling system.
Inspect the radiator cap for damage. The sealing surface must be clean.
Look for large amounts of dirt in the radiator core. Look for large amounts of dirt on the engine.
Shrouds that are loose or missing cause poor air flow for cooling. Testing The Cooling System
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