O-RING 1421402 - Caterpillar

Water/Supplemental Coolant Additive (SCA)
Never use water alone without supplemental coolant additive or inhibited coolant. Water alone is corrosive at engine operating temperatures.
A mixture of water and supplemental coolant additive does not protect against freezing or boiling.
A coolant mixture of water and supplemental coolant additive will cool and provide some protection to engine components, but it will NOT provide normal engine service life.
Caterpillar's recommendation for proper coolant is a minimum concentration of 30 percent glycol and 70 percent acceptable water and supplemental coolant additive (three percent of the total mixture). This recommendation will maintain cooling system corrosion protection.
If freeze protection is not required or if antifreeze is not available, a coolant mixture that consists of acceptable water and supplemental coolant additive (SCA) can be used. If this coolant mixture is used, the concentration of SCA must be between 6 percent and 8 percent. Do not exceed an 8 percent maximum concentration of supplemental coolant additive (SCA). The concentration of SCA must be monitored.The 8T-5296 Test Kit can be used to evaluate the concentration of SCA. However, the following modifications must be made in STEP 3 and in STEP 5.* STEP 3 - Add tap water to the vial up to the "20 ml" mark.* STEP 5 - When the defined procedure is used, a concentration of 6 percent to 8 percent will yield between 20 drops and 27 drops. If the number of drops is below 20 drops, the concentration of SCA is low. If the number of drops is above 27 drops, the concentration of SCA is high. Make the appropriate adjustments to the concentration of SCA.If the concentration of SCA is above the maximum of 8 percent, drain some of the coolant mixture. Refill the system with acceptable water. Retest the concentration.Extended Life Coolant (ELC) Cooling System Maintenance
Use only Caterpillar products or commercial products that have passed Caterpillar EC-1 specification for premixed or concentrated coolants.Use only Caterpillar Extender with Extended Life Coolant.Mixing Extended Life Coolant with other products reduces the Extended Life Coolant service life. Failure to follow the recommendations can reduce cooling system components life unless appropriate corrective action is performed.
For the correct balance of antifreeze and of additives, proper care should be taken in order to maintain the concentration of Extended Life Coolant. Lowering the proportion of antifreeze lowers the proportion of additive. This will lower the ability of the coolant to protect the system from pitting, from cavitation, from erosion, and from deposits.Proper Additions to the Extended Life Coolant
Do not add Extended Life Coolant as a makeup solution for routine cooling system top-off. The addition of the concentrated Extended Life Coolant will increase the concentration of glycol in the cooling system.During the normal maintenance, use the premixed Extended Life Coolant as a cooling system top-off. This will bring the coolant up to the proper level. Use the Extended Life Coolant or use a coolant that meets the Caterpillar EC-1 specifications. If the proper coolant is not available, use distilled water or use deionized