Inspection of the Engine Compartment

m2 dm 11.04.001

    Warning: Washer fluids may be flammable and poisonous. Do not expose washer fluid to an open flame or any burning material, such as a cigarette. Always comply with the washer fluid manufacturer's recommended safety precautions.

  1. Check the windshield washer reservoir fluid level. The reservoir is usually located near the right-hand frame rail.
  2. After resetting the air intake restriction indicator during the daily pretrip inspection, check the indicator again with the engine off.
    1. Check an indicator with graduations to see if air restriction exceeds the value shown in Table..
      Check a go/no-go indicator without graduations to see if the colored bar shows through the clear window.

      Table 1, Air Intake Maximum Restriction Values

      Air Intake Maximum Restriction Values (in H2O)

      Engine Make

      GHG14, GHG17, and GHG21 Engines

      Detroit

      18

      Cummins

      25

        Table 1, Air Intake Maximum Restriction Values

      1. 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.
      2. If air restriction exceeds the maximum value again, replace the air cleaner. For instructions, see  of the Business Class M2 Workshop Manual .
    2. If the vehicle is equipped with an Allison automatic transmission, check the automatic transmission fluid level.
    3. 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 properly. Many jurisdictions now issue fines for draining fuel/water separators onto the ground.

      1. Place a suitable container under the fuel/water separator.

        2. Note: A hose may be used to direct water into the container. On older DAVCO models, the drain valve has a 1/2-inch (12.7-mm) pipe with threads. Use a hose with a 1/2-inch pipe thread to fit correctly and open the drain valve by turning it one-quarter revolution. On new DAVCO models, the drain valve has a 3/4-inch (19-mm) slip-on hose connection; pipe threads are no longer used. Open the drain valve by turning it one to one-and-a-half revolutions.

      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.
      3. Alliance/Racor Models : Turn the drain plug counterclockwise to open it. See Fig..
        DAVCO Models : Remove the vent cap and open the drain. See Fig. and Fig..
      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.

        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. 1, Alliance Fuel/Water Separator Assembly and Installation

        1. Inlet Port/Check Valve

        2. Lower Housing

        3. Bypass Valve

        4. Filter Element

        5. Spring

        6. Cover O-Ring

        7. Clear Cover

        8. Vent Cap O-Ring

        9. Vent Cap

        10. Collar

        11. 120VAC Pre-Heater

        12. 12VDC Pre-Heater

        13. Drain Valve

        Fig. 2, DAVCO Fuel Pro 482

        1. Drain Valve

        2. Drain Valve Cap

        3. 120VAC Pre-Heater

        4. Inlet Port/Check Valve

        5. Lower Housing

        6. Bypass Valve

        7. 12VDC Pre-Heater

        8. Filter Element

        9. Spring

        10. Cover O-Ring

        11. Clear Cover

        12. Vent Cap O-Ring

        13. Vent Cap

        14. Collar

        Fig. 3, DAVCO Fuel Pro 487

    4. Inspect the steering components. See Fig..

      1. Steering Gear Mounting Bolt

      2. Pitman Arm Pinch Bolt Nut

      3. Drag Link Nut

      Fig. 4, Steering Gear Fasteners

      1. Inspect tie rods, steering arms, and the drag link for signs of looseness (i.e., shiny spots or rust tracks).
      2. Check the steering gear mounting bolts and pitman arm nut for signs of looseness.
      3. Check the drag link nuts for missing cotter pins.
      4. Inspect the steering intermediate shaft and end yokes for excessive looseness or other damage.

      5. Notice: Do not drive with a drive belt that is visibly worn or damaged. If it fails, the lack of coolant flow could rapidly cause damage to engine components.

    5. Inspect the serpentine drive belts for signs of glazing, frayed edges, breaks, cracks, or oil contamination.
    Note:
    Parent topic: Weekly Post-Trip Inspection and Maintenance
    Document Number: 0000117334
    Manual Publication Date: 2025-02-11
    Topic Publication Date: 2024-05-09