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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. |
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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. |
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| Illustration 1 | g01110647 |
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| Illustration 2 | g00311543 |
Replace the water temperature regulator (thermostat) on a regular basis in order to reduce the chance of unscheduled downtime and the chance of problems with the cooling system.
The thermostat should be replaced after the cooling system has been cleaned. Replace the thermostat and the seals while the cooling system is completely drained or while the cooling system coolant is drained to a level that is below the thermostat housing.
Note: If you are only replacing the thermostat, drain the cooling system coolant to a level that is below the thermostat housing.
Note: In the following illustrations, the engine has been removed from the machine for photographic purposes only.
- Remove two bolts (1), elbow (2) and the O-ring seal. Replace the O-ring seal if the seal is worn or damaged.
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Illustration 4 g00311944 - Remove gasket (4), three bolts (3) and housing (5).
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Illustration 5 g00311945 - Remove gasket (6) and water temperature regulator (7). Install a new water temperature regulator.
- Inspect the gaskets. Replace the gaskets if wear or damage is evident.
- Install housing (5) and three bolts (3).
- Install elbow (2) and two bolts (1).
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| Illustration 3 | g00311943 |
