ENGINE MAINTENANCE PREVENTIVE MAINTENANCE
– 170 – Y53-6033
Regional Haul (R05/10)
Please follow these recommendations when you are
changing your fuel filters or strainer elements. Your vehi-
cle's engine will run better and last longer if you do. See
the engine manufacturer'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
contact. Mechanical tightening of these filters may
distort or crack the filter head.
• When replacing a fuel filter element, do not use a sub-
stitute. Install only filter elements designed for fuel fil-
tration. 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 leak-
age.
• After starting the engine, check for leaks around the
filter.
Filter Draining
Check fuel filter/water separator daily. Check with engine
OFF. Depending on the fuel storage facility, more fre-
quent 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.
If entrapped water exceeds sump volume, you can either:
