Detroit Diesel MBE 4000 Service Manual page 396

5.3 COOLANT
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In some areas, tap water can contain high levels of dissolved
chlorides, sulfates, magnesium, and calcium, causing scale
deposits, sludge deposits and/or corrosion. These deposits can
damage the coolant pump and allow the engine to overheat.
5.3.2.1 Coolant Specifications and Concentration
To avoid damage to the cooling system, use only an approved corrosion-inhibiting antifreeze.
Approved antifreeze must be fully-formulated and comply with the requirements of the Truck
Maintenance Council (TMC). Coolant specifications are listed in Table 5-1.
Type of Coolant
Fully-Formulated Ethylene Glycol
Water plus Corrosion Inhibitors
Table 5-1 Coolant Specifications
When topping off the cooling system after a drop in the coolant level, the concentration of
corrosion-inhibiting antifreeze in the coolant must be 50 percent by volume. This affords
protection down to a temperature of –34 F (–37 C). The cooling mixing ratio is listed in Table 5-2.
NOTE:
If the concentration is too low, there is risk of corrosion/cavitation in the cooling system.
Do not increase the proportion (mixing ratio) of corrosion-inhibiting antifreeze beyond 60 percent
by volume (this gives the maximum antifreeze protection). Further increases in the mixing
ratio would reduce the level of antifreeze protection and adversely affect the coolant's ability to
dissipate heat.
Antifreeze Protection Down
to F ( C)
–34 (–37)
–62 (–52)
Table 5-2 Coolant Mixing Ratio
5.3.3 Supplemental Coolant Additives for Fully Formulated Coolant
The concentrations of some inhibitors will gradually deplete during normal engine operation.
SCAs replenish the protection for cooling system components. The coolant must be maintained
with the proper concentration of SCA. Detroit Diesel Power Cool maintenance SCAs are
recommended.
5-8
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NOTICE:
TMC RP-329 Type "A"
Temperature Must Not Fall Below 32 F (0 C)
Water % by Volume
50
40
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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Requirement
Corrosion - Inhibiting
Antifreeze % by Volume
50
The cooling mix ratio is Max. 60
All information subject to change without notice.
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