Air Intake Maximum Restriction Values: inH
2
O
(mmH
2
)
Engine Make
Pre-EPA07 (ADR
80/02) Engines
EPA07 (ADR 80/
03) Engines
Cummins 25 (635) 25 (635)
Detroit 20 (255) 22 (560)
Mercedes-Benz 22 (560) 22 (560)
Table 23.2, Air Intake Maximum Restriction Values
2.
If air restriction exceeds the maximum allowable
value, operate the vehicle for one more day,
making sure not to run the engine over rated
rpm. Refer to the engine operation manual for
more information on rated rpm for your engine.
If air restriction exceeds the maximum value
again, replace the air cleaner. For instructions,
refer to Group 09 of the Century Class Trucks
Workshop Manual.
Engine Compartment Inspection
Tilt the cab. See Chapter 2 for instructions.
1.
Check for water in the fuel/water separator, if
equipped.
IMPORTANT: When draining fluid from a
fuel/water separator, drain the fluid into an
appropriate container and dispose of it prop-
erly. Many jurisdictions now issue fines for
draining fuel/water separators onto the
ground.
1.1
Place a suitable container under the fuel/
water separator.
NOTE: A hose may be used to direct water
into the container. Use a hose with a ½-inch
pipe thread on DAVCO models.
IMPORTANT: Water in the fuel/water separa-
tor will appear as beads. Drain the fuel/water
separator only enough to remove the water.
Stop draining fluid when fuel begins to drain
out. If the fuel/water separator is drained of
fuel, it will be necessary to prime the fuel
system before the vehicle can be started
again.
1.2
If the engine is equipped with a built-in
water separator, loosen the drain valve,
and allow the water to run out. Close the
drain valve, taking care not to overtighten
it.
1.3
Alliance/Racor Models: Turn the drain plug
counterclockwise to open it. See
Fig. 23.9.
DAVCO Models: Remove the vent cap
and open the drain. See
Fig. 23.10.
1.4
Stop draining fluid when fuel begins to
drain out.
Alliance/Racor Models: Turn the drain plug
clockwise to close it.
DAVCO Models: Close the drain valve.
Install and hand-tighten the vent cap.
2.
Inspect the steering components.
02/03/2010 f470552
1
2
3
4
5
6
7
8
9
10
11
1. Washers (qty 2)
2. Nuts (qty 2)
3. Frame Rail
4. Fuel Outlet Port
5. Fuel Inlet Port
6. Priming Pump
7. Mounting Head
8. Mounting Bolts (qty 2)
9. Filter Element
10. Sight Bowl
11. Drain Plug
Fig. 23.9, Alliance Fuel/Water Separator Assembly and
Installation
Pre- and Post-Trip Inspections and Maintenance
23.8
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