Freightliner Coronado 132 / 122SD. Manual — part 27
Title of Maintenance Operation (MOP)
MOP Number
Fuel Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–01
Fuel Tank Band-Nut Tightening. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–03
Fuel/Water Separator Element Checking and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–02
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
For engine-mounted fuel filter replacement, refer to
the engine manufacturer’s service manual for re-
moval and installation procedures.
47–02 Fuel/Water Separator
Element Checking and
Replacement
Alliance/Racor
The only maintenance necessary on an Alliance or
Racor fuel/water separator is to replace the filter
element.
WARNING
Fluid circulated through the fuel/water separator
to heat the fuel may be diesel fuel returned from
the engine, or engine coolant. Drain the fuel/water
separator only when the engine and fluids have
cooled. Draining it when the engine is hot could
cause severe personal injury due to scalding.
If returning fuel is released into the atmosphere,
its vapors can ignite in the presence of any igni-
tion source. Do not expose the fuel to, or work
with the fuel system near, open flame or intense
heat. To do so could cause fire, possibly resulting
in serious personal injury or property damage.
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 land.
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 the
bowl and element.
7.
Connect the water sensor and heater connectors
if equipped.
8.
If equipped with a primer pump, prime the
fuel/water separator as follows.
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.
Davco Fuel Pro® 382 and 482
WARNING
Fluid circulated through the fuel/water separator
to heat the fuel may be diesel fuel returned from
the engine, or engine coolant. Drain the fuel/water
separator only when the engine and fluids have
cooled. Draining it when the engine is hot could
cause severe personal injury due to scalding.
If returning fuel is released into the atmosphere,
its vapors can ignite in the presence of any igni-
tion source. Do not expose the fuel to, or work
with the fuel system near, open flame or intense
heat. To do so could cause fire, possibly resulting
in serious personal injury or property damage.
The filter element should be changed only when the
fuel level has reached the top of the filter element.
There is no significant restriction to fuel flow until the
element is completely clogged.
Fuel
47
47/1
1.
Shut down the engine, apply the parking brake,
and chock the tires.
2.
Check the fuel level in the fuel filter. Replace the
fuel/water separator element only when the filter
element is completely covered. If the fuel level
has reached the top of the filter element, follow
the procedure below to replace the element.
NOTE: In the event of an emergency, when the
filter needs replacement but a Davco filter is not
available for the Fuel Pro 382, a temporary filter
can be used; see the procedure under the
heading "Emergency Temporary Filter Replace-
ment, Fuel Pro 382."
3.
Put a clean receptacle under the fuel/water sepa-
rator and attach a piece of hose to the drain
valve, to direct fuel into the receptacle.
The drain valve has a 1/2-inch (12.7-mm) pipe;
use a hose with a 1/2-inch pipe thread to fit cor-
rectly.
4.
Remove the vent cap (
, Item 4) and open
the drain valve (
, Item 1) to drain the fuel
completely, then close the drain valve.
5.
Using a DAVCO Collar Wrench (
), remove
the clear cover and collar.
NOTE: Broken vent cap and collar warranty
claims will not be accepted if any tool other than
a DAVCO Collar Wrench is used for removal.
During installation, the vent cap and collar are
5
4
3
1
2
06/25/97
f470147
6
7
11
10
9
8
1.
Mounting Head
2.
Fuel Primer Pump
3.
Vent Plug
4.
Bowl O-Ring
5.
Bowl Gasket
6.
Bowl Probe Plug
7.
Water Sensor Probe
8.
Heater Connector
9.
Drain Plug
10. Sight Bowl
11. Filter Element
Fig. 1, Alliance Fuel/Water Separator
f470506b
05/05/2009
4
1
3
5
2
6
1.
Drain Valve
2.
Lower Housing
3.
Clear Cover
4.
Vent Cap
5.
Collar
6.
Inlet Port/Check Valve
Fig. 2, DAVCO Fuel/Water Separator (Fuel Pro 382
Shown)
02/16/2009
f470277
VENT CAP
FOR REMOVAL OF TOP COLLAR ONLY
Fig. 3, DAVCO Collar Wrench
Fuel
47
47/2
to be hand-tightened only, not tightened with a
wrench. Use part number 482017 on Fuel Pro
482 units; part number 380134 on Fuel Pro 382
units.
6.
Remove the filter, cover O-ring, and vent cap
O-ring. Dispose of them in an environmentally
acceptable manner. See
or
7.
Clean all threads and sealing surfaces very thor-
oughly. Even a small amount of dirt will prevent
the fuel/water separator from sealing, and an air
leak may result.
8.
On Fuel Pro 382 units, install the grommet on
the bottom of the new filter.
9.
Install the new filter and grommet assembly and
cover O-ring on the housing.
10. Install the clear cover and the collar. Hand-
tighten the collar.
11. Prime the system
11.1
Ensure that the drain valve is closed.
11.2
Fill the housing to the top with clean die-
sel fuel.
11.3
Install and hand-tighten the vent cap
O-ring and vent cap.
11.4
Start the engine. When the lubricating oil
reaches its normal operating pressure,
increase engine speed to high idle for
one to two minutes to purge air from the
system.
11.5
While the engine is running, and after the
air is purged from the system, loosen the
vent cap until the fuel level falls to just
above the collar, then hand-tighten the
vent cap.
11.6
Check for leaks and shut down the en-
gine.
Emergency Temporary Filter
Replacement, Fuel Pro 382
WARNING
Fluid circulated through the fuel/water separator
to heat the fuel may be diesel fuel returned from
the engine, or engine coolant. Drain the fuel/water
separator only when the engine and fluids have
05/05/2009
f470531
3
4
5
6
7
8
9
10
11
12
13
1
2
1.
Drain Valve
2.
Bottom Plate
Assembly
3.
Bottom Plate O-Ring
4.
Lower Housing
5.
Cover O-Ring
6.
Filter Element
7.
Spring
8.
Clear Cover
9.
Vent Cap O-Ring
10. Vent Cap
11. Collar
12. Inlet Port/Check Valve
13. Heat Exchanger
Fig. 4, DAVCO Fuel Pro 382
Fuel
47
47/3
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