Freightliner Century Class. Manual — part 32
MOP Number
Fuel Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–01
Fuel Separator Sight Bowl Cleaning and Element Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–02
Fuel Tank Band-Nut Tightening. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–03
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–00
Fuel
47
Index, Alphabetical
47–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle can not drop. Failure to follow these steps
could result in serious personal injury or death.
47–01 Fuel Filter Replacement
Refer to the engine manufacturer’s service manual
for removal and installation procedures.
47–02 Fuel Separator Sight
Bowl Cleaning and
Element Replacement
ConMet Fuel Separator Sight
Bowl Cleaning
The only maintenance necessary on ConMet fuel
separators is to clean the sight bowl, if equipped.
See
WARNING
Diesel fuel is flammable and can ignite if exposed
to an open flame, intense heat, or other ignition
source. Do not drain fuel near, or expose fuel
vapor to open flame or intense heat. Exposure to
open flame or intense heat could start a fire, pos-
sibly resulting in personal injury or property dam-
age. When working on a fuel system, have a fire
extinguisher within easy reach.
1.
Drain the fuel separator.
2.
Unscrew the sight bowl from the fuel separator.
3.
Wipe the sight bowl clean using a soft cloth.
4.
Lubricate the gasket with a film of oil, and rein-
stall it on the sight bowl. If the gasket appears
dry-rotted or damaged, replace the gasket.
5.
Lightly lubricate the threads on the sight bowl
with oil, then thread the sight bowl into the bot-
tom of the fuel separator.
6.
Hand-tighten until the gasket is in full contact
with the fuel separator, then tighten an additional
1/4 to 1/3 turn.
7.
Check that the drain valve is tightened and
closed.
8.
Prime the fuel separator.
8.1
Remove the vacuum breaker fitting and
fill the unit with diesel fuel.
8.2
Replace and close the vacuum breaker
fitting when the unit is full of fuel.
IMPORTANT: The fitting must be air-tight
and the valve closed.
Racor Fuel Separator Element
Replacement
The only service necessary on Racor fuel separators
is to replace the filter element.
Racor 490
WARNING
Diesel fuel is flammable and can ignite if exposed
to an open flame, intense heat, or other ignition
source. Do not drain fuel near, or expose fuel
vapor to open flame or intense heat. Exposure to
open flame or intense heat could start a fire, pos-
sibly resulting in personal injury or property dam-
age. When working on a fuel system, have a fire
extinguisher within easy reach.
1.
Drain off some fuel by loosening the vent plug
and opening the drain valve.
2.
Disconnect the water sensor and heater connec-
tions, if equipped.
3.
Remove the element and bowl, together, by turn-
ing counterclockwise.
4.
Remove the bowl from the element, and clean
the O-ring.
5.
Apply a coating of clean fuel or motor oil to the
new O-ring and element seal.
Fuel
47
47/1
6.
Spin the bowl onto the new element, then spin
them both onto the filter head snugly, by hand
only.
IMPORTANT: Do not use tools to tighten.
7.
Connect the water sensor and heater connec-
tors, if equipped.
8.
Prime the fuel separator.
8.1
Loosen the vent plug. Then operate the
primer pump until the fuel purges at the
vent plug. See
8.2
Close the vent plug.
9.
Start the engine and check for fuel leaks.
10. Shut down the engine and correct any fuel leaks.
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10
9
8
7
6
5
4
3
3
2
1
1.
Vacuum Breaker/Drain Valve
2.
Reducer Bushing
3.
Mounting Brackets
4.
O-Ring (when equipped with heater)
5.
Stainless Steel V-Clamp (when equipped with
heater)
6.
Heater Assembly
7.
Gasket
8.
Sight Bowl Heater Rod
9.
Sight Bowl Assembly
10. Vacuum Breaker/Drain Valve
Fig. 1, ConMet Fuel Separator
5
4
3
1
2
06/25/97
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6
7
11
10
9
8
1.
Beige Mounting Head
2.
Fuel Primer Pump
3.
Metal Vent Plug
4.
Bowl O-Ring
5.
Bowl Bevel-Cut
Gasket
6.
Bowl Probe Plug
7.
Water Sensor Probe
8.
Heater Connector
9.
Bowl Drain Valve
Assembly
10. Bowl with Drain and
Water Sensor
11. Service Element
Fig. 2, Racor 490 Fuel Separator
Fuel
47
47/2
Racor 690
WARNING
Diesel fuel is flammable and can ignite if exposed
to an open flame, intense heat, or other ignition
source. Do not drain fuel near, or expose fuel
vapor to open flame or intense heat. Exposure to
open flame or intense heat could start a fire, pos-
sibly resulting in personal injury or property dam-
age. When working on a fuel system, have a fire
extinguisher within easy reach.
1.
Drain off some fuel by loosening the vent plug
and opening the drain valve.
2.
Disconnect the water sensor and heater connec-
tions, if equipped.
3.
Remove the element and bowl, together, by turn-
ing counterclockwise.
4.
Remove the bowl from the element, and clean
the O-ring.
5.
Apply a coating of clean fuel or motor oil to the
new O-ring and element seal.
6.
Spin the bowl onto the new element, then spin
them both onto the filter head snugly, by hand
only.
IMPORTANT: Do not use tools to tighten.
7.
Connect the water sensor and heater connec-
tors, if equipped.
8.
Prime the fuel separator.
8.1
Remove the 3/8-inch metal plug located
at the top of the fuel/water separator (see
, Ref. 2), and manually fill the unit
with diesel fuel.
8.2
Replace and tighten the 3/8-inch metal
plug when the unit is full.
9.
Start the engine and check for fuel leaks.
10. Shut down the engine and correct any fuel leaks.
47–03 Fuel Tank Band-Nut
Tightening
Hold each fuel tank band retention nut with a wrench
while backing off its jam nut. Then tighten the reten-
tion nuts 30 to 35 lbf·ft (41 to 46 N·m). After the re-
tention nuts have been tightened, hold each retention
nut with a wrench while tightening its jam nut 30 lbf·ft
(41 N·m).
IMPORTANT: Do not overtighten.
09/15/95
f470148
1
2
3
4
10
9
7
8
6
5
1.
Beige Mounting Head
2.
Metal Plug, 3/8" NPT
3.
Bowl O-Ring
4.
Bowl Bevel-Cut
Gasket
5.
Bowl Probe Plug
6.
Water Sensor Probe
7.
Heater Connector
8.
Bowl Drain Valve
Assembly
9.
Bowl with Drain and
Water Sensor
10. Service Element
Fig. 3, Racor 690 Fuel Separator
Fuel
47
47/3
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