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Pressurized system: Hot coolant can cause serious burn. To open cap, stop engine, wait until radiator is cool. Then loosen cap slowly to relieve the pressure. |
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Failure to replace the engine's thermostat on a regularly scheduled basis could cause severe engine damage. |
| NOTICE |
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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 machine. 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 in Caterpillar machines. Dispose of all fluids according to local regulations and mandates. |
Replace the water temperature regulator on a regular basis in order to 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.
Note: If you are only replacing the water temperature regulator, drain the cooling system coolant to a level that is below the regulator housing.
- Remove the engine access cover on the left side of the machine.
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| Illustration 1 | g00528876 |
- Loosen clamp (1) and disconnect elbow (2) from the radiator hose.
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| Illustration 2 | g00529136 |
- Remove four bolts (3) and elbow (2). Remove all of the used gasket from the elbow.
- Remove water temperature regulator (4) .
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| Illustration 3 | g00529139 |
- Install a new water temperature regulator in the regulator housing.
Water temperature regulators can be reused under the following conditions:
- The water temperature regulator meets test specifications.
- The water temperature regulator is not damaged.
- The water temperature regulator does not have excessive buildup of deposits.
- The water temperature regulator meets test specifications.
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Caterpillar engines incorporate a shunt design cooling system and require operating the engine with a thermostat installed. If the thermostat is installed wrong, it will cause the engine to overheat. Inspect gaskets before assembly and replace if worn or damaged. |
- Install a new gasket, elbow (2) and four bolts (3) .
- Connect elbow (2) to the radiator hose. Tighten clamp (1) .
- Install the engine access cover.