Navistar WorkStar Series, Operator'S Manual

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Maintenance Instructions
Ultra ELC (Yellow) coolant. International Truck recommends
using only the approved coolant with the 2010 cooling packages,
and will not warrant these cooling systems that have not utilized
the recommended coolant.
The label on the deaeration tank provides additional
coolant/antifreeze information. Consult the Engine Operation
and Maintenance Manual for coolant service life details.
Some engines are ordered with an optional coolant filter that
should be replaced periodically.
For Ultra ELC equipped vehicles use only water filters without
Supplemental Coolant Additives (SCA’s) as SCA’s are not
necessary with Ultra ELC. Any time a silicone gasket/seal
exposed to the coolant is replaced while using Ultra ELC, a
fresh charge of silicates must be added to the coolant to protect
the new gasket/seal.
International® truck recommends Ultra ELC due to its ease of
maintenance and lower long-term cost of operation. Any system
using or contaminated with more than 10% conventional coolant
must be maintained like conventional coolant and receive regular
tests for Supplemental Coolant Additive (SCA) levels.
AntiFreeze
For cooling system capacities coolant part numbers, and
other information, refer to SECTION 7 — MAINTENANCE
INTERVALS AND SPECIFICATIONS of this manual.
Fan Clutch
Inspect for proper operation, secure electrical connections, and
air supply as appropriate. See the Service Manual for details.
Fuel System
GOVERNMENT REGULATION: Diesel fuel sold for
use in 2007 and later highway vehicles must be limited
to a sulfur content of 15 parts per million (ppm).
Frequently inspect condition of fuel tanks and mounting
hardware, fuel tank cap and vent, fuel lines, clips and routing.
At every PM (or daily if necessary) drain water and sediment
from the fuel/water separator filter (if equipped). If the vehicle is
equipped with an optional Davco® fuel/water separator, inspect
the level of the fuel in the see-through globe and replace the
fuel/water separator filter element if the fuel level has reached
the top of the globe. In all cases, be sure to use the proper
fuel/water separator filter element with the correct part number
and filter efficiency rating.
Fuel Tank Draining and Cleaning
Periodically (annually is recommended) drain water and
sediment from the fuel tank via the drain plug on the bottom of
the fuel tank. Drain and flush sediment from fuel tank at least
every 12 months or more frequently if fuel quality or type of fuel
dictates.
Since Ultra-Low Sulfur Diesel (ULSD) fuel tends to absorb
more water and engines are operating at higher temperatures,
microbe growth in the fuel tanks has become more prevalent.
Microbe growth results in more contaminants in the fuel and
reduces fuel filter life. Since fuel tank draining does not remove
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