MAINTENANCE SECTION 5
Page 25
DRESSTA OM560C99/1E
COOLING SYSTEM
WARNING! Do not mix types of antifreeze solutions. Mixed solutions make it
impossible to determine the protection against freezing. Antifreeze containing
sealer or anti-leak additives should not be used in this system. Sealer or anti-
leak additives will plug the coolant filter and cause plugging problems in the
cooling system.
Table included in Engine Manual shows percentage of antifreeze concentration required for various
temperatures.
5.8.3. INHIBITORS / CONDITIONERS
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 metallic surfaces of the cooling system, which
reduces heat transfer. Cooling system conditioners which contain these inhibitors must be
added to maintain corrosion protection.
2. SOLUBLE OIL IS NOT RECOMMMENDED for use in the engine as its use will reduce heat
transfer.
Fig. 5.16. Coolant Filter
REPLENISHING COOLANT CONDITIONER
Replenishing coolant conditioner is performed by periodical replacement of the filters (Fig. 5.16)
containing DCA4 inhibitor protecting the cooling system against corrosion and cavitation erosion of
the cylinder sleeves and coolant pump blades.
COOLANT TESTING FOR CONDITIONER CONCENTRATION
Coolant testing for DCA4 concentration should be performed periodically before the coolant filter
replacement to determine the proper capacity of a filter to be applied. CC2626 test kit of the filter
manufacturer is designed for this purpose. The test procedure is included in the Engine Manual.
Prior to installation of a new coolant filter close the shut-off valve (Fig. 5.21) - OFF position. Upon
installation of a new coolant filter open the shut-off valve - ON position.
NOTE: Mixing of DCA4 and other supplemental coolant additives is not recommended because
there is currently no test kit available to measure concentration levels with mixed chemical
solutions.
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