Thomas SAF-T-LINER C2, Maintenance Manual

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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 3/4-inch (19-mm) slip-on
hose connection. Open the drain valve by turning
it one to one-and-a-half revolutions.
4. Remove the vent cap, shown in Fig. 2 , to drain
the fuel completely, then close the drain valve.
5. Using a DAVCO Collar Wrench, shown in Fig. 3 ,
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 (part number 482017)
is used for removal. During installation, the vent
cap is to be
hand-tightened only , not tightened
with a wrench.
6. Remove the filter, cover O-ring, and vent cap
O-ring. Dispose of them in an environmentally
acceptable manner. See
Fig. 2.
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. Install the new filter and grommet assembly and
cover O-ring on the housing.
Position the filter element so the key is lined up
with the keyway on the separator plate of the
housing. Use the arrow on the top of the end-
plate to align the filter. See
Fig. 4 . Ensure the
filter element is fully seated by firmly pushing on
the endplate. The filter should not rotate freely.
9. Install the clear cover and the collar. Simultane-
ously apply downward pressure to the top of the
clear cover until it is seated on the body of the
lower housing and hand tighten the collar until it
no longer spins freely. Using the collar wrench,
tighten the cover 18 lbf·ft (24 N·m). This is
equivalent to rotating the collar clockwise two or
three additional ribs, depending on the specific
filter model.
10. Prime the system
10.1 Ensure that the drain valve is closed.
10.2 Fill the housing to the top of the filter ele-
ment with clean diesel fuel.
10.3 Install and hand-tighten the vent cap
O-ring and vent cap.
10.4 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.
10.5 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.
10.6 Check for leaks and shut down the en-
gine.
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
Fuel
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Saf-T-Liner C2 School Bus Maintenance Manual, March 2019
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