SEAL-O-RING 2U5345 - Caterpillar

Failure to replace your thermostat on a regularly scheduled basis could cause severe engine damage.Caterpillar engines incorporate a shunt design cooling system and require operating the engine with a thermostat installed.If the thermostat is installed wrong, the engine may overheat, causing cylinder head damage. Ensure that the new thermostat is installed in the original position. Ensure that the thermostat vent hole is open.DO NOT use liquid gasket material on the gasket or cylinder head surface.
Refer to the Service Manual for the water temperature regulator replacement procedure, or consult with your Caterpillar dealer. If replacing thermostats ONLY, drain the coolant from the cooling system to a level below the thermostat housing.Refer to the Cooling System Specifications in this publication for all information regarding Acceptable Water, coolant/antifreeze and SCA requirements, or contact your Caterpillar dealer for assistance.Cooling System (Extended Life Coolant Only)
Add Extender
Caterpillar Extended Life Coolant (ELC) does not require the frequent Supplemental Coolant Additive (SCA) additions associated with the present conventional coolants. Only a "one time" coolant Extender is required.Extender should be added to ELC after 3000 service hours or two years, whichever comes first.Check the cooling system only when the engine is stopped and cool.1. Loosen the cooling system filler cap slowly to relieve pressure. Remove the cap.2. It may be necessary to drain enough coolant from the cooling system to allow for the addition of the Extender.3. Add Extender according to the requirements for your engine's cooling system capacity. Refer to the Refill Capacities chart in this manual for the cooling system capacity for your engine. Refer to the Coolant Specifications in this manual for the Caterpillar ELC Extender Additions chart.4. Clean the filler cap. Inspect the filler cap gaskets. Replace the cap if the gaskets are damaged. Clean the filler cap receptacle. Install the cap.Cooling System (Conventional Coolant/Antifreeze Only)
Drain/Clean/Replace Coolant
If Caterpillar DEAC is used, or if Caterpillar SCA/water coolant is used, this maintenance should be performed Every 3000 Hours or Every Two Years, whichever comes first.If a commercial HD coolant NOT manufactured by Caterpillar is used, or if a commercial SCA/water coolant NOT manufactured by Caterpillar is used, this maintenance should be performed Every 3000 Hours or a maximum of Every One Year.Clean/Flush the cooling system before the recommended maintenance interval if:* the coolant is heavily contaminated* the engine overheats frequently* foaming is observed* the oil cooler has failed, allowing oil to contaminate the coolant* fuel has entered the cooling system and contaminated the coolant
Use of commercially available cooling system cleaners may cause damage to cooling system components. Use only cooling system cleaners that are approved for Caterpillar engines.
A good time to inspect the water pump, replace the thermostat, and replace hoses is when your engine's cooling system has been drained.Drain
1. Stop the engine and allow the engine to cool. Loosen the cooling system cap slowly to relieve any pressure, and remove the cap.
Radiator (cooling system) filler cap (1) and drain valve (2).
Coolant drain plug locations.2. Open the cooling system drain valve (if equipped). If not