369-00004-0 Tohatsu PISTON (0.5MM O/S)

Excessive supplemental coolant additive concentration can form deposits on the higher temperature surfaces of the cooling system, reducing the engine's heat transfer characteristics. Reduced heat transfer could cause cracking of the cylinder head and other high temperature components.Excessive supplemental coolant additive concentration could also result in blockage of the heat exchanger, overheating, and/or accelerated wear of the water pump seal.Do not exceed the recommended amount of supplemental coolant additive concentration.
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" and to Special Publication, GECJ0003, "Cat Shop Supplies and Tools" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to applicable regulations and mandates.
Note: Caterpillar recommends an S O S coolant analysis (Level 1).Cooling Systems that Use Conventional Coolant
This maintenance procedure is required for conventional coolants such as DEAC.This maintenance is NOT required for cooling systems that are filled with Extended Life Coolant.Test the Concentration of the SCA
Do not exceed the recommended six percent supplemental coolant additive concentration.
Test the concentration of the SCA with the 8T-5296 Coolant Conditioner Test Kit.Add the SCA, If Necessary
Pressurized System: Hot coolant can cause serious burns. To open the cooling system filler cap, stop the engine and wait until the cooling system components are cool. Loosen the cooling system pressure cap slowly in order to relieve the pressure.
Remove the cooling system filler cap slowly.
If necessary, drain some coolant in order to allow space for the addition of the SCA.
Add the proper amount of SCA. For the proper amount of SCA, refer to this Operation and Maintenance Manual, "Refill Capacities and Recommendations" topic. The proper concentration of SCA depends on the type of coolant that is used. For the proper concentration of SCA, refer to Special Publication, SEBU7003, "3600 Series and C280 Series Diesel Engine Fluids Recommendations".
Clean the cooling system filler cap. Install the cooling system filler cap. Cooling Systems that Use Water and SCA
Test the Concentration of the SCA
Test the concentration of the SCA with a 298-5311 Coolant Nitrite Test Kit for SCA or perform an S O S Coolant Analysis. The test kit includes the following items: a tool for the testing, 30 ampoules for testing nitrite, instructions and a case. 294-7420 Test Kit contains the refill ampoules for the 298-5311 Coolant Nitrite Test Kit. Use the instructions that are included with the test kit in order to properly conduct the testing. Refer to this Operation and Maintenance Manual, "Maintenance Interval Schedule" for the times at which the procedures should be conducted. Test the concentration of the SCA more frequently if more frequent testing is indicated by the results of the S O S Coolant Analysis.
Do not exceed the recommended eight percent supplemental coolant additive concentration.
Add the SCA, If Necessary
Pressurized System: Hot coolant can cause serious burns. To open the cooling system filler cap, stop the engine and wait until the cooling system components are cool. Loosen the cooling system pressure cap slowly in order to relieve the pressure.
Remove the cooling system filler cap slowly.
If necessary, drain some coolant in order to allow space for the addition of the SCA.
Add the proper amount of SCA. For the proper amount of SCA, refer to this Operation and Maintenance Manual, "Refill Capacities and Recommendations" topic. For the proper concentration of SCA, refer to Special Publication, SEBU7003, "3600 Series and C280 Series Diesel Engine Fluids Recommendations".
Clean the cooling system filler cap. Install the cooling system filler cap.