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SERIES 50 FUEL MIXER FOR THE SERIES 50G LOW PRESSURE SYSTEM

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 support brackets and located at the right rear of the engine. See Figure 27789 . ‪

1. Fuel Mixer Assembly ‪

5. Low Pressure Regulator ‪

2. Pulse Width Modulated Stepper Motor Valve (PSV) ‪

6. Air Balance Hose ‪

3. Fuel Supply Hose ‪

7. Air Inlet Tube ‪

4. Fuel Balance Hose ‪

Low Pressure Fuel System (Series 50G Engine)

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 and remove the PSV from the fuel mixer, refer to Section .
  3. Remove four fuel mixer mounting bolts.
  4. Separate and remove the fuel mixer from the mounting bracket.

Disassembly of Fuel Mixer for the Series 50G Engine

Disassembly of the fuel mixer is not required. ‪

Cleaning of Fuel Mixer for the Series 50G Engine

Cleaning of the fuel mixer is not required. ‪

Inspection of Fuel Mixer for the Series 50G Engine

Inspection of the fuel mixer is not required. ‪

Test of Fuel Mixer for the Series 50G Engine

Test of the fuel mixer is not required. ‪

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 mounting bracket with four bolts. Torque to 20 Nm (15 lbft).
  3. Install the PSV to the fuel mixer, refer to Section .

    EXPLOSION

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

    • Do not smoke when installing or servicing the engine or fuel system.
    • Installation or servicing of natural gas equipment must only be conducted in well ventilated, natural gas-compatible areas. Do not install or service equipment in an enclosed area where ignition sources are present without first ensuring that an undetected gas leak may be safely vented without being ignited.
    • Bleed natural gas lines before installing or servicing any component connected to the fuel lines.
    • Natural gas fuel systems are pressurized. Relieve pressure from any fuel system component prior to installation or service of that component.
    • 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.
  4. Perform a leak check procedure. Refer to Section .