83495M Mariner RIVET

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Effects of pressure on a cooling systemTemperature and pressure are complementary in a pressure type cooling system. When a diagnosis is made of a cooling system problem, both 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 altitude on the boiling point of a water.
Personal injury can result from hot coolant, steam and alkali.At operating temperature, engine coolant is hot and under pressure. The heat exchanger and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns.Remove the filler cap slowly to relieve pressure only when the engine is stopped and the filler cap for the heat exchanger is cool enough to touch with your bare hand.Cooling System Conditioner contains alkali. Avoid contact with skin and eyes.
The coolant must be to the correct level in order to test the cooling system. The engine must be cold and the engine must not be running. While the engine is cool, slowly loosen the pressure cap in order to relieve the cooling system pressure. 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.Tools for Cooling System Testing
Table 1
Required Tools    
Part
Number    Part Description    Qty    
4C-6500     Digital Thermometer     1    
9S-8140     Pressurizing Pump     1    
9U-7400     Multitach Tool Group     1    
1U-7297     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.
The connection of any electrical equipment and the disconnection of any electrical equipment may cause an explosion hazard which may result in injury or death. Do not connect any electrical equipment or disconnect any electrical equipment in an explosive atmosphere.
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4C-6500 Digital Thermometer The 4C-6500 Digital Thermometer is used in the diagnosis of overheating conditions and in the diagnosis of overcooling conditions. This tool can be used to check temperatures in several different parts of the cooling system. Refer to Operating Manual, NEHS0554, " 4C-6500 Digital Thermometer Group" for the testing procedure.
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9U-7400 Multitach The 9U-7400 Multitach Tool Group is used to check 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 cooling system's pressure cap. This pressurizing pump is also used to pressure test the cooling system for leaks.
Illustration 5 g00439083
1U-7297 Coolant/Battery Tester Check the coolant frequently in cold weather for the proper glycol concentration. Use the 1U-7297 Coolant/Battery Tester in order to ensure adequate freeze protection. The tester gives immediate, accurate readings. The tester can be used to test antifreeze/coolants that contain ethylene glycol or propylene glycol. Making the Correct Antifreeze Mixtures
Adding pure antifreeze as a makeup solution for the cooling system top-off is an unacceptable practice. Adding pure antifreeze increases the concentration of antifreeze in the cooling system. This increases the concentration of the dissolved solids and the undissolved chemical inhibitors in the cooling system. Add the antifreeze and water mixture in the same concentration as your cooling system. Refer to Operation and Maintenance Manual, "General Coolant Information" for determining the correct concentration of antifreeze and water