Navistar MaxxForce DT 9, Operation And Maintenance Manual

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SECTION 5 – MAINTENANCE SCHEDULE AND SERVICE PROCEDURES
Service Procedures (cont.)
WATER SEPARATOR (cont.)
2. Put a suitable container under water drain valve or drain
hose.
3. Turn ignition switch to ON. This will start the electric fuel
pump. Do not start engine.
NOTE: The water/fuel mixture will drain slowly and may take up
to a minute to attain pure fuel flow.
4. Turn water drain valve to open and allow water/fuel mixture
to drain. Continue draining until only fuel is draining.
NOTE: Fuel will only drain from the water drain valve as long as
the electric fuel pump is running. The electric fuel pump can run
any where from 10 to 20 seconds. Do not turn the ignition switch
to OFF then ON again without waiting the 10 seconds. If the 10
seconds waiting period is not observed, the electric fuel pump
will not restart.
5. Fuel will only flow as long as the fuel pump is running. If
additional fuel pump run time is desired, turn the ignition
switch to OFF, wait 10 seconds then turn the ignition switch
to ON to continue draining water.
6. Once fuel-water draining is complete, close water drain
valve and turn the ignition switch to OFF.
7. Recycle or dispose of drained fluids properly according to
applicable regulations.
CHARGE AIR COOLER (CAC)
Service Interval: Before Engine Operation
WARNING: To prevent personal injury or death, shut
down engine, set parking brake, and block wheels before
inspecting the Charge Air Cooler.
1. Inspect Charge Air Cooler (CAC) core for debris, damaged,
and clogged external fins.
2. Before starting engine remove any debris blocking the core.
Form No. 1172040R1
Page 66
Printed in the United States of America