KIT-GASKET 3509621 - Caterpillar

You must read and understand the warnings and instructions contained in the Safety section of this manual before performing any operation or maintenance procedures.Water Temperature Regulator (Thermostat)
Replace
Replacing your thermostat prior to failure is a recommended preventive maintenance practice because it reduces the chances for unscheduled downtime.Depending on load, a thermostat that fails in a partially opened position will cause either an overheating or an over cooling condition.If the thermostat fails in the closed position, it will cause excessive overheating. Excessive overheating could result in cylinder head cracking or piston seizure problems.If the thermostat fails in the open position, it will cause the engine operating temperature to be too low during partial load operation. Low engine operating temperatures during partial loads could cause an excessive carbon build-up inside the cylinder. This excessive carbon build-up could result in accelerated ring and liner wear.
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
Do not perform this maintenance until you read and understand the material in the Safety and Cooling System Specifications sections of this publication.
Add Extender (Long Life Coolant/Antifreeze Only)
Caterpillar Long Life Coolant/Antifreeze (LLCA) 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 LLCA after 3,000 service hours or two years, whichever comes first. The cooling system should be treated with .95 L (1 qt) of Extender for every 46 L (12 US gal) of cooling system capacity. A 15 percent over or under treatment will not create any cooling system problems.For more Extender information, refer to the Extender topic in the Cooling System Specifications in this manual.Drain/Clean/Replace Coolant (Conventional Coolant/Antifreeze Only)
Do not perform this maintenance until you read and understand the material in the Safety and Cooling System Specifications sections of this publication.
Clean/Flush the cooling system before the recommended maintenance interval if:* Coolant is heavily contaminated* The engine overheats frequently* Foaming is observed in the expansion tank* 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