Detroit Diesel MBE 4000 Service Manual page 554

13.1 SCHEDULED INTERVALS
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drain coolant/add antifreeze until the concentration is correct. The coolant mixing ratio
is listed in Table 13-7.
Antifreeze Protection Down
to F ( C)
–34 (–37)
–62 (–52)
*Concentrations of 60 percent affords the maximum antifreeze protection. Higher concentrations adversely affect heat dissipation.
Table 13-7 Coolant Mixing Ratio
NOTE:
When topping off, use only a pre-prepared coolant mixture containing a 50 percent
concentration by volume of corrosion-inhibiting antifreeze.
If the concentration of antifreeze is too low, there is a risk of
corrosion or cavitation in the cooling system.
3. Check the coolant level and add more coolant if necessary.
13.1.6 Coolant Inhibitor Test Intervals
Coolant inhibitor level should be checked at the intervals listed in Table 13-8.
If topping off is needed, add coolant which is identical to the initial fill coolant.
Check the nitrite concentration at regular intervals as listed in Table 13-9 with a Power Trac
3–Way Test Strip. Nitrite levels must be within 800–2400 PPM. Additional SCA must be added
to the coolant when it becomes depleted, as indicated by a nitrite concentration of 800 PPM or
less. If the nitrite concentration is greater than 800 PPM, do not add additional SCA. If the nitrite
concentration is above 2400 PPM, the system is over-inhibited and should be partially drained
and filled with a 50/50 mix of water and EG or PG.
NOTE:
Drain intervals listed in Table 13-9 are dependent on proper maintenance.
Service Application
On-highway Trucks and Motor Coaches
City Transit Coaches, Pick-up and Delivery Short Trip,
and Emergency Vehicles
Industrial, Continuous Duty Generator Set, and all Other
Applications
Stand-by Generator Set
Table 13-8 Required Coolant Inhibitor Test Intervals
13-20
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Water Percentage by Volume
50
40
NOTICE:
20,000 Miles (32,000 Kilometers
6,00 Miles (9,600 Kilometers) or three months, whichever
comes first
500 Hours or three months, whichever comes first
200 Hours or yearly, whichever comes first
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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Corrosion-Inhibiting Antifreeze
Percentage by Volume
50
Maximum 60*
Inhibitor Test Interval
All information subject to change without notice.
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