HOUSING 6N8970 - Caterpillar

Testing the Supplemental Coolant Additive and the Glycol
Refer to the engine Operation and Maintenance Manual for further information about testing the cooling system.Testing for Air and/or Exhaust Gas in the Coolant
Air and/or exhaust gas in the coolant causes foaming and aeration. Bubbles in the cooling system reduce the heat transfer and the pump flow. Pockets of air or gas can prevent coolant from contacting parts of the engine. The pockets allow hot spots to develop.If the cooling system is not filled to the proper level, air can be trapped in the system. Filling the cooling system too quickly can also trap air in the system. Leaks from components such as aftercoolers and hoses can allow air to enter the system. The inlet of the water pump is a potential location for the entry of air.To help prevent air from entering the cooling system, fill the system slowly. The radiator cap must be removed when filling the system from the bottom. Make sure that all the hoses and pipe connections are secure.If the cylinder head is loose or cracked, exhaust gas can enter the cooling system. Exhaust gas can also enter the cooling system through internal cracks and/or defects in the cylinder head gasket.Air and/or exhaust gas in the cooling system can cause overheating. Use the following test to check for the presence of air and/or exhaust gas in the coolant.
Make sure that the cooling system is filled to the proper level.
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Remove the plug from the radiator (if equipped). Install a hose into the hole for the plug.
Fill a clear container with water and place the other end of the hose into the container.
Start the engine. Operate the engine until normal operating temperature is reached.
Observe the end of the hose in the clear container.A bubble may rise occasionally from the hose. An occasional bubble is normal.Air and/or exhaust gas in the coolant is indicated by a stream of bubbles.Testing the Radiator Fan (If Equipped)
Table 2
Required Tools
Part Number Part Name Qty
348-5430 Multi-Tool Gp 1
308-7264 Multitach Tool Gp 1 The 348-5430 Multi-Tool Gp and the 308-7264 Multitach Tool Gp are used together to check the fan speed. For instructions, refer to the Operating Manual, NEHS1087 and Operating Manual, NEHS0605.Testing the Cap Assembly
Table 3
Required Tools
Part Number Part Name Qty
9S-8140 Pressurizing Pump 1
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Radiator
(1) Radiator cap
(2) Coolant tank
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9S-8140 Pressurizing Pump
(3) Release valve
(4) 2P-2329 Adapter As
(5) HoseThe 9S-8140 Pressurizing Pump is used to test the cooling system for leaks. The pump can also be used to test the cap assembly, the pressure relief valve, and the pressure gauge.To check for the amount of pressure that opens the cap assembly, use the following procedure:
After the engine cools, carefully loosen the cap assembly in order to release the pressure from the cooling system. Remove the cap assembly.
Carefully inspect the cap assembly. Look for any damage to the seals and to the sealing surface.Remove any deposits that are found.If the cap assembly is damaged, obtain a new cap