0329390 JOHNSON GASKET, Impeller housing

Note: Test the concentration of the Supplemental Coolant Additive (SCA) or test the SCA concentration as part of an S O S Coolant Analysis.Test for SCA Concentration
Coolant and SCA
Do not exceed the recommended six percent supplemental coolant additive concentration.
Use the 8T-5296 Coolant Conditioner Test Kit or use the 4C-9301 Coolant Conditioner Test Kit in order to check the concentration of the SCA. Refer to this Operation and Maintenance Manual, "Refill Capacities and Recommendations" for more information.Water and SCA
Do not exceed the recommended eight percent supplemental coolant additive concentration.
Test the concentration of the SCA with the 8T-5296 Coolant Conditioner Test Kit. Refer to the Special Publication, SEBU6251, "Caterpillar Commercial Diesel Engine Fluids Recommendations" for more information.S O S Coolant Analysis
S O S coolant samples can be analyzed at your Caterpillar dealer. S O S Coolant Analysis is a program that is based on periodic samples.Level 1
Level 1 is a basic analysis of the coolant. The following items are tested:
Glycol Concentration
Concentration of SCA
pH
ConductivityThe results are reported, and recommendations are made according to the results. Consult your Caterpillar dealer for information on the benefits of managing your equipment with an S O S Coolant Analysis.Level 2
This level coolant analysis is recommended when the engine is overhauled. Refer to this Operations and Maintenance Manual, "Overhaul Considerations" for further information.Add the SCA, If Necessary
Do not exceed the recommended amount of supplemental coolant additive concentration. 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 radiator tube blockage, overheating, and/or accelerated water pump seal wear. Never use both liquid supplemental coolant additive and the spin-on element (if equipped) at the same time. The use of those additives together could result in supplemental coolant additive concentration exceeding the recommended maximum.
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.
When any servicing or repair of the engine cooling system is performed the procedure must be performed with the engine on level ground. This will allow you to accurately check the coolant level. This will also help in avoiding the risk of introducing an air lock into the coolant system.
Slowly loosen the cooling system filler cap in order to relieve the pressure. Remove the cooling system filler cap. Note: Always discard drained fluids according to local regulations.
If necessary, drain some coolant from the cooling system into a suitable container in order to allow space for the extra SCA.
Add the proper amount of SCA. Refer to the Special Publication, SEBU6251, "Caterpillar Commercial Diesel Engines Fluids Recommendations" for more information on SCA requirements.
Clean the cooling system filler cap. Inspect the gaskets of the cooling system filler cap. If the gaskets are damaged, replace the old cooling system filler cap with a new cooling system filler cap. Install the cooling system filler cap.