OPERATOR'S MANUAL

Preventive Maintenance Engine Maintenance
Medium Duty
(R05/09) Y53-6027 – 175 –
WARNING! Use Ultra Low Sulfur Diesel fuel only.
Failure to do so may damage components of the
engine and Diesel Particulate Filter (DPF).
Please follow these recommendations when you are chang-
ing your fuel filters or strainer elements. Your vehicle's engine
will run better and last longer if you do. See the engine man-
ufacturer's recommendations for proper water and micron
requirements.
Installing Fuel Filters
When removing filters, cover any electrical equipment and
wiring that might get soaked with fuel. Diesel fuel may per-
manently damage electrical insulation.
When installing spin–on (throwaway) filters:
1. Prefill filter with fuel.
2. Moisten gasket with diesel fuel.
3. Hand tighten them only 1/2 to 2/3 turn after gasket con-
tact. Mechanical tightening of these filters may distort or
crack the filter head.
• When replacing a fuel filter element, do not use a substi-
tute. Install only filter elements designed for fuel filtration.
First clean and inspect the shell. Then insert the new
element and fill the container at least 2/3 full of clean fuel
before installing the shell
NOTE: To expel air from density-type strainer
elements, soak them in clean fuel before install-
ing them.
• Throw away old gaskets. Replace them with new ones to
ensure a positive seal.
• Position the shell and gasket properly. Then tighten the
cover nut or bolt just enough to prevent fuel leakage.
• After starting the engine, check for leaks around the fil-
ter.
Filter Draining
Check fuel filter/water separator daily. Check with engine
OFF. Depending on the fuel storage facility, more frequent
draining may be required.
1. Open drain valve (by hand only): turn valve screw
counter-clockwise approximately 1 1/2 to 2 turns until
draining occurs. Drain filter sump of water until clear fuel
is visible.