Operator`s manual

46 Cooling System
Regular Coolant Change Interval
Replace the coolant every 250,000 miles
(400,000 km), 4,000 hours or every two
years, whichever comes first.
Coolant SCA level must be tested at least
twice per year or whenever coolant loss
occurs. For maximum coolant system
efficiency, test the system every 25,000 to
30,000 miles (40,000 to 56,000 km)
depending on engine oil change interval or
every 1,000 hours or maximum every
6 months (whichever comes first).
The SCA level must be between 1.5
(Cummins: 1.2) and 3.0 SCA units per
gallon (0.4 [Cummins: 0.3] and 0.8 SCA
units per liter) of coolant.
Note: Always dispose of coolant according
to Federal or local regulations. Take all used
coolant to a recycling or waste collection
center.
Coolant Filter Change Intervals
The charged coolant filter contains 8 units
of SCA that are released slowly over time
to maintain the recommended level during
operation.
Change the coolant filter at every 50,000
miles (80,500 km). If the SCA level tests
above 3.0, DO NOT replace the coolant
filter. When testing indicates that the SCA
level has dropped below 1.5 units per US
gallon (0.4 units per liter) start changing the
filter with the oil changes again.
Note: Test the SCA level every 6 months
(whichever comes first).
WARNING
Hot engine. Keep yourself clear of all hot
engine parts and/or fluids. A hot engine
and/or fluids can cause serious burns.