Preventive Maintenance Engine Maintenance
Medium Duty
(R10/06) Y53-6008 – 141 –
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.
If entrapped water exceeds sump volume, you can
either:
A. Close valve and run engine until smooth idle is
established, then repeat drain procedures, or
B. Remove filter from mounting head, completely drain
all fluid, and reassemble filter assembly. Be sure to
follow new filter assembly instructions.
2. Close drain valve by turning valve screw clockwise
approximately 1 1/2 to 2 turns.
CAUTION: Do not overtighten the valve. Over-
tightening can damage the threads.
Fuel Tanks
1. Inspect fuel tanks, fuel hoses, and fittings to ensure
proper positioning and fastening; check for leaks.
2. Inspect mounting brackets, straps, and pins to ensure
proper positioning & fastening every 15,000 miles/
24,000 km (see label on fuel tank and data below):
Type of Tank Tank Strap T-Bolt Nut Torque
Aluminum 30 Lb. ft. (41 Nm)
Cylindrical Steel 8 Lb. ft. (11 Nm)
