Skip to main content

SERIES 50 FUEL MIXER FOR THE SERIES 50G HIGH PRESSURE SYSTEM 1998 AND LATER

The venturi fuel mixer assembly consists of a die cast aluminum body with a spun aluminum venturi permanently inserted into it. The unit has no moving parts. The mixer assembly is attached to the throttle located at the left front of the engine. See Figure 34515 . ‪

1. Fuel Temperature Sensor ‪

5. Air Inlet Elbow ‪

2. PSV ‪

6. Low Pressure Regulator ‪

3. Fuel Mixer ‪

7. Air Temperature Sensor ‪

4. Throttle ‪

8. Fuel Pressure Sensor ‪

9. Fuel Inlet Tee Fitting ‪

Fuel Mixer for the Series 50G

Replacement of Fuel Mixer for the Series 50G Engine

The fuel mixer is non-serviceable and should be replaced as a unit. No adjustment is required. ‪

Removal of Fuel Mixer for the Series 50G Engine

Remove the fuel mixer as follows: ‪

EXPLOSION

To avoid injury from the explosion of natural gas, the engine must be kept in a well ventilated area away from open flames, sparks, and electrical resistance (heating) coils.

  1. Vent fuel system; refer to Section and refer to Section .
  2. Disconnect hose between mixer and charge cooler outlet tube.
  3. Disconnect and remove the PSV from the fuel mixer, refer to Section .
  4. Disconnect air balance hose at mixer.
  5. Remove four fuel mixer mounting bolts.
  6. Separate and remove the fuel mixer from the throttle.

Installation of Fuel Mixer for the Series 50G Engine

Install the fuel mixer as follows: ‪

  1. Clean gasket surface and install a new gasket.
  2. Secure the fuel mixer to the throttle with four bolts finger tight.
  3. Install the PSV to the fuel mixer, refer to Section .
  4. Connect air balance hose to PSV and mixer.
  5. Torque mixer bolts to 20 Nm (15 ftlbs).
  6. Connect hose between mixer and charge cooler outlet tube.

    EXPLOSION

    To avoid injury from an explosion of natural gas, the following precautions must be taken:

    • Use a combustible-gas detector. Liquefied natural gas (LNG) is odorless and cannot be detected by smell. Compressed Natural gas (CNG) may be odorless and may not be detected by smell.
    • Equipment fuel systems are the responsibility of the Original Equipment Manufacturer (OEM). Equipment fuel system guidelines must be closely adhered to when installing or servicing equipment. Refer to OEM guidelines specifying which maintenance procedures require venting of fuel lines and fuel tanks.
    • LNG systems are pressurized and contain extremely cold (-260 F [-162 C]) fluids. Contact the fuel supplier or OEM for LNG safety requirements. Contact with LNG may cause personal injury (freezing).
    • Vent systems on the equipment should be ducted to a safe area whenever equipment is in an enclosed area.
  7. Perform a leak check procedure. Refer to Section .