Air Intake Maximum Restriction Values (inH
2
O)
Engine Make EPA10 Engines GHG14 Engines
Cummins 25 25
Detroit 22 18
Table 21.2, Air Intake Maximum Restriction Values
2.2
If air restriction exceeds the maximum al-
lowable value, operate the vehicle for one
more day, making sure not to run the en-
gine over rated rpm. Refer to the engine
operation manual for more information on
rated rpm for your engine.
2.3
If air restriction exceeds the maximum
value again, replace the air cleaner. For
instructions, refer to Group 09 of the
108SD and 114SD Workshop Manual.
3.
If the vehicle is equipped with an Allison auto-
matic transmission, check the automatic trans-
mission fluid level.
4.
Check for water in the fuel/water separator, if
equipped.
4.1
Place a suitable container under the fuel/
water separator. Many states now issue
fines for draining fuel/water separators
onto the ground.
NOTE: A hose may be used to direct water
into the container. Use a hose with a ½-inch
pipe thread on DAVCO models.
4.2
Alliance/Racor Models: Turn the drain plug
counterclockwise to open it. See
Fig. 21.12.
06/29/2009 f470536
2
5
6
7
8
9
10
11
12
1
3
4
1. Pressure Relief Device
2. Fuel Inlet Line
3. Check Valve
4. CNG Quick-Connect Port
5. Coolant Inlet Line
6. Vaporizer
7. Fuel Shutoff Solenoid Valve
8. Coolant Outlet Line
9. Pressure Gauge
10. Overpressure Regulator
11. Pressure Relief Valve
12. Fuel Outlet Line
Fig. 21.11, LNG Vaporizer Assembly
Pre- and Post-Trip Inspections and Maintenance
21.10
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