MAINTENANCE In tropical climates where antifreeze availability may be limited, use a corrosion inhibitor or supplemental coolant additive (SCA), to protect the engine cooling system. 20.6.4 SUPPLEMENTAL COOLANT ADDITIVES 1. All supplemental cooling system additives, including those in antifreeze solutions, become depleted through normal operation. If the coolant additives in antifreeze are allowed to become depleted, the antifreeze becomes corrosive and attacks and coats the metallic surfaces of the cooling system which reduces heat transfer. Cooling system conditioners which contain these additives must be added to maintain corrosion protection. 2.
SOLUBLE OIL IS NOT RECOMMENDED for use in this engine as its use will reduce heat transfer and allow internal engine damage. 3. There are no miracle additives that will increase heat transfer or prevent overheating. Conditioned water is still the best coolant. 4. A corrosion inhibitor/conditioner is recommended to inhibit corrosion in the cooling system for the following reasons: Improved compatibility with high silicate antifreezes to minimize hydro-gel formation if over concentration occurs. Provides engine protection in several areas:
- Solder corrosion/bloom Copper corrosion/erosion/stress cracking - Oil fouling - Cylinder liner cavitation corrosion - Aluminum cavitation corrosion - Seal and gasket degradation Maintenance of Supplemental Coolant Additives Keeping the engine coolant properly inhibited will keep the engine and radiator free of rust, scale deposits and corrosion. New machines are delivered with antifreeze protection. Service at a regular scheduled interval specified in 23.1 on page 3-26 , with a replacement coolant filter. Each time the coolant is drained and replaced, the coolant must be recharged with supplemental coolant additives.
New coolant can be correctly charged with coolant additives by using a replacement coolant filter and/or concentrate. If coolant is added between drain intervals, additional coolant additives may be required. 3-16 WA320-3MC Approximate Freezing Point Percentage of Antifreeze Concentration by Volume Specific Gravity at 16 0 (+32 -7 (+20 -12 -18 -23 (-10 -29 (-20 -34 (-30 -40 (-40 -46 (-50 -51 (-60 -57 (-70 -62 (-80 -68 (-90 -69 (-92 0 15 25 33 40 45 48 53 56 59 62 65 67 68 1.000 1.025 1.040 1.053 1.062 1.070 1.074 1.080 1.083 1.088 1.092 1.095 1.097 1.098