HUB 1326532 - Caterpillar

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.
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 or while the cooling system coolant is drained to a level that is below the water temperature regulator housing.
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 a water temperature regulator, drain the cooling system coolant to a level that is below the water temperature regulator housing.
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 Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
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Remove the hose clamp and remove the hose from the water temperature regulator housing.
Remove the bolts from the water temperature regulator housing. Remove the water temperature regulator housing and seal.
Former water temperature regulators may be used, if they meet the test specifications and are not damaged or have excessive buildup or 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.
Install a new seal in the new water temperature regulator housing. Install the water temperature regulator housing and the bolts.
Install the hose. Tighten the hose clamp.
Refill the cooling system.ReferenceFor all cooling system requirements, refer to the Operation and Maintenance Manual, SEBU6250, "Caterpillar Machine Fluids Recommendations".ReferenceFor information on the cooling system capacity, refer to the Operation and Maintenance Manual, "Lubricant Viscosities and Refill Capacities" for the machine that is being serviced.