GEAR GP-REAR 4170758 - Caterpillar

Testing The Heat Exchanger And Cooling System For Leaks
Table 4
Tools Needed    
Part Number     Part Name     Quantity    
9S-8140     Pressurizing Pump     1    
127-6880     Cap-Pressure (14 psi)     1    Use the following procedure in order to check the cooling system for leaks:
After the engine is cool, loosen the pressure cap slowly and allow pressure out of the cooling system. Then remove the pressure cap from the expansion tank.
Ensure that the coolant level in the expansion tank is full.
Install the 127-8660 pressure cap onto the expansion tank.
Illustration 9 g02521416
Remove the 2P-2329 Adapter As (1) from the swivel end of the 3R-3810 Hose As (2) .
Illustration 10 g02521417
Remove 1/8 inch NPT plug (3) from the coolant fill line.
Illustration 11 g02521418
Connect the swivel (4) on the 3R-3810 Hose As to the port in the coolant fill line.
Increase the pressure on the gauge on the pump to 69 kPa (10 psi).
Check expansion tank for leakage.
Check all connection points for leakage, and check the hoses for leakage.The cooling system does not have leakage only if the following conditions exist:
You do NOT observe any outside leakage.
The pressure reading remains steady after 5 minutes.Note: Check the engine oil for evidence of coolant leakage.The inside of the engine cooling system has leakage only if the following conditions exist:
The reading on the gauge goes down.
You do NOT observe any outside leakage.
Evidence of coolant on the engine oil gauge.Note: Make any repairs, as required.
Carefully remove the 127-8660 pressure cap.
Reinstall the original pressure cap.
Ensure that the pressure in the cooling system has been released.
Remove the 9S-8140 pump assembly from the coolant fill line.
Reinstall the 1/8 inch NPT plug into the port in the coolant fill line.
Check the expansion tank for the correct level of coolant. Fill the expansion tank as needed.Test For The Water Temperature Gauge
Table 5
Tools Needed    
Part Number     Part Name     Quantity    
4C-6500
or
2F-7112     Digital Thermometer
or
Thermometer     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.
Check the accuracy of the coolant temperature indicator or coolant temperature sensor if you find either of the following conditions:
The engine runs at a temperature that is too hot, but a normal temperature is indicated. A loss of coolant is found.
The engine runs at a normal temperature, but a hot temperature is indicated. No loss of coolant is found.Coolant temperature can also be read on the display screens of the Caterpillar Electronic Technician (ET).
Illustration 12 g01040299
Typical example (1) Port (2) Coolant temperature sensorRemove the plug from port (1). Install one of the following thermometers in the open port:
The 4C-6500 Digital Thermometer
The 2F-7112 Thermometer A temperature indicator of known accuracy can also be used to make this check.Start the engine. Run the engine until the temperature reaches the desired range according to the test thermometer. The reading on the water temperature indicator should