Navistar MaxxForce DT 9, Operation And Maintenance Manual

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SECTION 5 – MAINTENANCE SCHEDULE AND SERVICE PROCEDURES
Service Procedures (cont.)
FUEL FILTER (cont.)
1. Set parking brake and shift transmission to park or neutral.
WARNING: To prevent personal injury or death,
make sure that the engine has cooled before removing
components.
2. Turn ignition switch to OFF and allow engine to cool before
removing components.
WARNING: To prevent personal injury or death, wear
safety glasses with side shields. Limit compressed air
pressure to 207 kPa (30 psi).
CAUTION: To prevent engine damage, clean area around fuel
filter housing before removing fuel filter cover. This will protect
the open fuel filter housing from contaminants falling into the
housing. If contaminants do fall in, remove them and blow out
fuel filter housing with compressed air before installing a new
filter element. Contaminants reaching high-pressure fuel system
components may cause component failure.
3. Clean engine compartment components in the area of the
fuel filter housing using compressed air, before removing
the fuel filter cover. Also, wipe the fuel filter cover clean
to prevent contaminants from entering the fuel system.
Contaminants may cause engine failure.
4. Using a 23 mm wrench, loosen the fuel filter cover
counterclockwise three and one-half turns to expose
the vent hole below O-ring.
5. If necessary, attach a hose to the end of the water drain
valve.
6. Put a suitable container under the water drain valve.
7. Open water drain valve and drain the fuel filter assembly.
8. Close water drain valve.
9. Recycle or dispose of fuel according to applicable
regulations.
Form No. 1172040R1
Printed in the United States of America
Page 81