BRIDGE AS-EXHAUST 4N5611 - Caterpillar

Introduction
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.
Illustration 1 g00286266
Cooling system pressure at specific altitudes and boiling points of water
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.Required Tools
Table 1
Required Tools
Part Number Part Name Qty
4C-6500 Digital Thermometer 1
8T-2700 Blowby/Air Flow Indicator 1
9U-7400 Multitach Tool Group 1
9S-8140 Pressurizing Pump 1
1U-7297 Coolant/Battery Tester 1
1U-7298 Coolant/Battery Tester 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 g00876179
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.
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8T-2700 Blowby/Air Flow Indicator
The 8T-2700 Blowby/Air Flow Indicator is used to check the air flow through the radiator core. Refer to Special Instruction, SEHS8712, "Using the 8T-2700 Blowby/Air Flow Indicator" for the test procedure for checking blowby and air flow.
Illustration 4 g00286276
9U-7400 Multitach Tool Group
The 9U-7400 Multitach Tool Group is used to measure the fan speed. Refer to Operating Manual, NEHS0605, " 9U-7400 Multitach Tool Group" for the testing procedure.
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9S-8140 Pressurizing Pump
The 9S-8140 Pressurizing Pump is used to test the filler caps. This pressurizing pump is also used to pressure test the cooling system for leaks.
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1U-7297 Coolant/Battery Tester or 1U-7298 Coolant/Battery Tester
Check the coolant frequently in cold weather for the proper glycol concentration. Use either the 1U-7297 Coolant/Battery Tester or the 1U-7298 Coolant/Battery Tester in order to ensure adequate freeze protection. The testers are identical except for the temperature scale. The testers give immediate, accurate readings. The testers can be used for antifreeze/coolants that contain ethylene or propylene glycol.Test Procedure
Making the Correct Antifreeze Mixtures
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