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20. USE OF FUEL, COOLANT AND LUBRICANTS
20.24
lNHlBlTORS/CONDlTlONERS
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.
SOLUBLE OIL IS NOT RECOMMENDED
for use in this engine as its use will reduce heat transfer.
There are no miracle additives that will increase heat transfer or prevent overheating.
the best coolant.
Conditioned water is still
20.2.4.1
MAINTENANCE
OF COOLING SYSTEM INHIBITORS
Keeping the engine coolant properly inhibited will keep the engine and radiator free of rust, scale deposits and
corrosion.
New vehicles are delivered with Antifreeze
protection
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 concentrate listed in the table DCA4 Unit Guide.
If coolant is added between drain intervals, additional DCA4 will be required.
20.2.4.2
COOLANT
TESTING FOR CONDITIONER
CONCENTRATION
II
DCA4 UNIT GUIDE
II
Fleetguard Part No.
DCA4 Liquid
DCAGOLDCA80L
DCA4 Powder
DCA95
DCA4 Units
4 - 0.473 P (1 pt)
1760 - 208 e (55 gal)
20
When the cooling system is maintained as recommended,
the conditioner concentration
should be satisfactory.
The
DCA4 concentration must not fall below 1 .O unit per 3.8 I? (1 gal) or exceed 2 units per 3.8 P (1 gal). The only accurate
method for testing chemical concentrations
in coolant with mixed chemical compounds
is a laboratory analysis. For
this reason, the coolant inhibitor should be maintained as shown in the MAINTENANCE
SCHEDULE CHART.
REMARK
Inadequate
concentration
of the coolant additive
can result in major corrosive
damage to cooling system
components. Over-concentration
can cause formation of gel that can cause restriction, plugging of passages and
overheating.
20.2.4.3
REPLENISHING
THE COOLANT
CONDITIONER
When antifreeze is added, add coolant conditioner equal to 1.0 unit per 3.8 e (1 gal) of antifreeze.
REMARK
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.
3-12
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