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GENERAL
12
SUPPLEMENTAL COOLANT ADDITIVES
1.
All cooling system inhibitors, including those in antifreeze solutions, become depleted through normal operation. If the
inhibitors in antifreeze are allowed to become depleted, the antifreeze becomes corrosive and attacks and coats the metal-
lic surfaces of the cooling system which reduces heat transfer. Cooling system conditioners that contain these inhibitors
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.
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 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 the following areas:
- Solder corrosion/bloom
- Oil fouling
- Aluminum cavitation corrosion
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 regular scheduled intervals specified in with a service
DCA4 filter.
Each time the coolant is drained and replaced, the coolant must be recharged with DCA4. New coolant can be correctly
charged with supplemental coolant additives by using DCA4 filters or DCA4 concentrate listed in the table entitled, "DCA4
Unit Guide."
If coolant is added between drain intervals, additional DCA4 will be required.
COOLANT TESTING FOR CONDITIONER CONCENTRATION
When the cooling system is maintained as recommended, the conditioner concentration should be satisfactory. The DCA4 con-
centration must not fall below 1.0 unit per 3.8 liters (1 US gal) or exceed 2 units per 3.8 liters (1 US gal) of coolant. The only
accurate method for testing chemical concentrations in coolant with mixed chemical compounds is a laboratory analysis.
Maintain the coolant inhibitor.
Inadequate concentration of the coolant additive can result in major corrosive damage to cooling system components.
Over concentration can cause gel formation that can plug coolant passages, causing overheating.
REPLENISHING COOLANT CONDITIONER
Install a "precharge" DCA4 filter when the coolant is changed or a significant (more than 50%) coolant loss occurs. Install a
service DCA4 filterat every 250 hour inspection. When antifreeze is added, add coolant conditioner equal to 1.0 unit per 3.8
liters (1 US gal) of antifreeze.
Mixing of DCA4 and other supplemental coolant additives is not recommended because there is currently no test kit
available to measure the concentration levels of a mixed chemical solution.
GD530/650/670
FUEL, COOLANT, AND LUBRICANTS
- Copper corrosion/erosion/stress cracking
- Cylinder liner cavitation corrosion
- Seal and gasket degradation
01-9
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