CONTROL & MTG GP-ENGINE ELEK 2534522 - Caterpillar

Pressurizing Pump is used to test the filler caps. This pressurizing pump is also used to pressure test the cooling system for leaks.
Table 2
Tools Needed     Quantity    
9S-8140     Pressurizing Pump     1    
At operating temperature, the engine coolant is hot and under pressure.Steam can cause personal injury.Check the coolant level only after the engine has been stopped and the filler cap is cool enough to touch with the bare hand.Remove the filler cap slowly to relieve pressure.Cooling system conditioner contains alkali. Avoid contact with skin and eyes to prevent personal injury.
One cause for a pressure loss in the cooling system can be a defective seal on the expansion tank filler cap.
Illustration 5 g00296067
Typical schematic of filler cap (1) Sealing surface of both filler cap and expansion tankAfter the engine cools, loosen the filler cap. Slowly release the pressure from the cooling system. Then, remove the filler cap.Carefully inspect the filler cap. Look for any damage to the seals and to the sealing surface. Inspect the following components for any foreign substances:
filler cap
seal
surface for sealRemove any deposits or material that are found on these items.To check for the amount of pressure that opens the filler cap, use the following procedure:
Carefully remove the filler cap from the expansion tank of the heat exchanger.
Put the filler cap on the 9S-8140 Pressurizing Pump .
Look at the gauge for the exact pressure that opens the filler cap.
Compare the gauge's reading with the correct pressure that should open the filler cap:Note: The correct pressure that makes the filler cap open is on the filler cap.
If the filler cap is defective, replace the filler cap.Test For The Water Temperature Gauge
Table 3
Tools Needed     Quantity    
4C-6500
or
2F-7112     Digital Thermometer
or
Thermometer     1    
Illustration 6 g00331990
The back of the left cylinder head (Sending unit for the water temperature gauge.) Check the accuracy of the water temperature indicator or water 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.Remove the plug (1). Install one of the following thermometers:
The 4C-6500 Digital Thermometer
The 2F-7112 Thermometer A temperature indicator of known accuracy can also be used to make this check.
At operating temperature, the engine coolant is hot and under pressure.Steam can cause personal injury.Check the coolant level only after the engine has been stopped and the filler cap is cool enough to touch with the bare hand.Remove the filler cap slowly to relieve pressure.Cooling system conditioner contains alkali. Avoid contact with skin and eyes to prevent personal injury.
Illustration 7 g00300300
Water temperature gaugeStart the engine. Run the engine until the temperature reaches the desired range according to the test thermometer. If necessary, place a cover over part of the radiator in order to cause a restriction of the coolant flow. The reading on the water temperature indicator