HOSE AS 2G5658 - Caterpillar

This engine has a pressurized cooling system. A pressurized cooling system has two advantages. The cooling system can be operated in a safe manner at a temperature higher than the normal boiling point (steam) of water.This type of system prevents cavitation in the water pump. Cavitation is the forming of low pressure bubbles in liquids that are caused by mechanical forces. The formation of an air pocket or a steam pocket in this type of cooling system is difficult.
Illustration 1 g00921815
Boiling point of water
Remember that temperature and pressure work together. When a diagnosis is made of a cooling system problem, temperature and pressure must be checked. Cooling system pressure will have an effect on the cooling system temperature. For an example, refer to Illustration 1. This will show the effect of pressure on the boiling point (steam) of water. This will also show the effect of height above sea level.
Personal injury can result from hot coolant, steam and alkali.At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns.Remove filler cap slowly to relieve pressure only when engine is stopped and radiator cap is cool enough to touch with your bare hand.Cooling System Conditioner contains alkali. Avoid contact with skin and eyes.
The coolant level must be to the correct level in order to check the coolant system. The engine must be cold and the engine must not be running. After the engine is cool, loosen the pressure cap in order to relieve the pressure out of the cooling system. Then remove the pressure cap.The level of the coolant should not be more than 13 mm (0.5 inch) from the bottom of the filler pipe. If the cooling system is equipped with a sight glass, the coolant should be to the proper level in the sight glass.Test Tools For Cooling System
Table 1
Tools Needed
Part Number Part Name Quantity
348-5430 Multi-Tool Gp 1
308-7267 Thermistor Thermometer 1
NETG5044 Software license 1
9S-8140 Pressurizing Pump 1
308-7264 Multitach Tool Gp 1
351-8635 Tachometer Kit 1
245-5829 Coolant/Battery Tester Gp 1
Making contact with a running engine can cause burns from hot parts and can cause injury from rotating parts.When working on an engine that is running, avoid contact with hot parts and rotating parts.
Illustration 2 g02107525
308-7267 Digital Thermometer
The 308-7267 Digital Thermometer is used in the diagnosis of overheating conditions and in the diagnosis of overcooling conditions. This group can be used to check temperatures in several different parts of the cooling system. Refer to the tool's Operating Manual for the testing procedure.
Illustration 3 g01311364
348-5430 Multi-Tool Gp
The 348-5430 Multi-Tool Gp is used to check the air flow through the radiator core.
Illustration 4 g02107573
308-7264 Multitach Tool Group
The 308-7264 Multitach Tool Group is used to check the fan speed. Refer to the tool's Operating Manual for the testing procedure.The 308-7264 Multitach Tool Group can measure engine rpm from a magnetic pickup. This magnetic pickup is located