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Personal injury can result from hot coolant, steam and alkali. At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns. Remove filler cap slowly to relieve pressure only when engine is stopped and radiator cap is cool enough to touch with your bare hand. Do not attempt to tighten hose connections when the coolant is hot, the hose can come off causing burns. Cooling System Conditioner contains alkali. Avoid contact with skin and eyes. |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
Replace the water temperature regulator on a regular basis. This will reduce the chance of unscheduled downtime and of problems with the cooling system.
The water temperature regulator should be replaced after the cooling system has been cleaned. Replace the water temperature regulator while the cooling system is completely drained or while the cooling system has been drained to a level that is below the water temperature regulator.
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Failure to replace the engine's water temperature regulator on a regularly scheduled basis could cause severe engine damage. |
Note: If you are only replacing the water temperature regulator, drain the cooling system coolant to a level that is below the water temperature regulator. Drain the coolant into a suitable container.
- Open the engine compartment access door.
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Illustration 1 g00296329 - Remove two bolts (1) and one clip (2) from water temperature regulator housing (3). Move pipe (4) to the side.
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Illustration 2 g00584133 - Remove water temperature regulator (5) from water temperature regulator housing (3). Remove gasket (6) from water temperature regulator housing (3).
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NOTICE Former water temperature regulators may be used, if they meet test specifications and are not damaged or have excessive buildup or deposits.
Show/hide tableNOTICE Since Caterpillar engines incorporate a shunt design cooling system, it is mandatory to always operate the engine with a water temperature regulator.
Depending on load, failure to operate with a water temperature regulator could result in either an overheating or an overcooling condition.
Show/hide tableNOTICE If the water temperature regulator is installed incorrectly, it will cause the engine to overheat.
- Install a new gasket (6) and a new water temperature regulator (5) in water temperature regulator housing (3).
- Install pipe (4) to water temperature regulator housing (3). Install two bolts (1) and one clip (2) to water temperature regulator housing (3).
- Add the cooling system coolant. Maintain the coolant level within
13 mm (.50 inch) of the bottom of the filler tube. Close the engine compartment access door.
