KIT SEAL 0691263 - Caterpillar

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.
Illustration 1 g03513536There are two water temperature regulators. The water temperature regulator housing is located at the front of the engine near the alternator.It is necessary to remove the water temperature regulator housing in order to replace the water temperature regulators. Refer to Disassembly and Assembly, UENR0131, "Water Temperature Regulator - Remove and Install" for a typical procedure.It is necessary to remove the alternator, the bracket for the alternator, and the drive belt. These components must be removed in order to allow the removal of the water temperature regulator housing. Refer to Disassembly and Assembly, UENR0131 for the removal procedures for these components.Replace the water temperature regulators while the cooling system is drained completely or while the cooling system coolant is drained to a level that is below the water temperature regulator housing.Refer to Operation and Maintenance Manual, "Cooling System Coolant - Change" for information on draining the cooling system.
Failure to replace the engine's water temperature regulator on a regularly scheduled basis could cause severe engine damage.
The water temperature regulators may be reused if the water temperature regulators are within test specifications, are not damaged, and do not have excessive buildup of deposits.
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.
If the water temperature regulator is installed incorrectly, it will cause the engine to overheat.