The temperature regulators should be replaced after the cooling system has been cleaned. Replace the temperature regulators while the cooling system is drained. The temperature regulators may be replaced while the cooling system coolant is drained to a level that is below the regulator housing.
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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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Replace the thermostat on a regular basis in order to reduce the chance of unscheduled downtime and of problems with the cooling system. A new thermostat should be installed after the cooling system has been cleaned. Install the thermostat while the cooling system is completely drained or while the cooling system coolant is drained to a level that is below the thermostat housing. |
- The housing (3) for the temperature regulators is located on the front of the engine.
- Remove the bolts (1) and (2) from the elbow. Remove the elbow.
- Remove the two temperature regulators and the seals.
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NOTICE Since Caterpillar engines incorporate a shunt design cooling system, it is mandatory to always operate the engine with a thermostat.
Depending on load, failure to operate with a thermostat could result in either an overheating or an overcooling condition.
Show/hide tableNOTICE If the thermostat is installed incorrectly, it will cause the engine to overheat.
- Install new seals and install new temperature regulators. Install a new housing gasket.
- Install the elbow.
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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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| Illustration 1 | g01425470 |