Section 2.47 Fuel Filter Type for the Series 50G Engine

Section 2.47
Fuel Filter Type for the Series 50G Engine

The primary (High Pressure) natural gas filter and secondary (Low Pressure) natural gas filter must be a coalescing 0.3 micron @ 99.97% efficiency fuel filter. Detroit Diesel recommended filters include the following:‪

• Racor — fuel filter 23529393 for use only with fuel filter housing FFC-113
• Racor — fuel filter 23529394 for use only with fuel filter housing FFC-114

The high pressure gas filter is mounted between the manual shutoff valve and the DDEC controlled shutoff valve. ‪

Section 2.47.1
Replacement of Fuel Filter for the Series 50G Engine

Replacement of the fuel filter. See Figure "Replacement of the Fuel Filter" .‪

Figure 1. Replacement of the Fuel Filter

Section 2.47.2
Removal of Fuel Filter for the Series 50G Engine

Prior to removal or replacement of the fuel filter, the fuel system must be vented. Refer to "2.43.1 Venting an Operable Engine to Relieve Natural Gas Pressure" and refer to "2.43.2 Venting an Inoperable Engine to Relieve Natural Gas Pressure" .‪

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.‪

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 (-162° C [-260° F]) 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.

Remove fuel filter as follows:‪

1. Unscrew the bottom fuel filter housing and filter element from fuel filter housing head. See Figure "Current Fuel Filter Assemblies" .
   
   
   Note: Fuel filter seal is located on top of the fuel filter.

   Figure 2. Current Fuel Filter Assemblies

2. Remove the two bolts from fuel filter housing head.

   NOTICE:
   Ensure the handle rests on the outer edge of the filter head to avoid damage to the threads.‪

3. Place a screwdriver or equivalent tool with a soft handle through the bypass holes in the center tube. See Figure "Removal of Former Center Tube" .
   

   1. Filter Housing Head‪

   2. Former Center Tube‪

   Figure 3. Removal of Former Center Tube

4. Remove the center tube by gently tapping the metal end of the screwdriver, down away from the filter head.

   Note: Discard bypass spring and former center tube with holes.

Section 2.47.2.1
Inspection of Fuel Filter for the Series 50G Engine

Inspect the fuel filter as follows:‪

1. Inspect the inside of the fuel filter for dirt, debris, foreign objects.
   1. If dirt, debris, foreign objects are found; replace the fuel filter.
   2. If no damage if found, reuse the fuel filter.

      Note: Oil saturation on the outside of the fuel filter is a NORMAL condition of the oil coalescing process.

2. Inspect the fuel filter seal on the fuel filter.
   1. If the fuel filter seal is worn, ripped, torn; replace the fuel filter.
   2. If no damage is found on the fuel filter seal ; reuse the fuel filter.

Section 2.47.3
Installation of Fuel Filter for the Series 50G Engine

‪

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 (-162° C [-260° F]) 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.

Install the fuel filter as follows:‪

1. Place the fuel filter housing head on a flat surface facing up.
2. Insert new center tube in the center hole of the fuel filter housing head.

   Note: Use a press to push the center tube into the hole of the fuel filter housing head. Center tube should seat flush at rolled portion of tube.

3. Install fuel filter housing head on mounting bracket with the two bolts torque to 40.67–47.45 N·m (30–35 lb·ft).
4. Install correct fuel filter element into fuel filter housing head.

   Note: Ensure that the correct fuel filter is being used with the correct fuel filter housing unit. FFC-113 and FFC-114 are not interchangeable. Fuel filter 23529393 cannot be used in the FFC-114 fuel filter housing; and fuel filter 23529394 cannot be used in the FFC-113 fuel filter housing. Fuel filter assemblies are listed in Table "Former and Current Part Numbers for the Fuel Filter Center Tube" .

   Fuel Filter Housing‪	Former Fuel Filter Part Number ‪	Current Fuel Filter Part Number ‪
   FFC-113‪	23528074‪	23529393*‪
   FFC-114‪	23528074‪	23529394*‪

   Table 7. Former and Current Part Numbers for the Fuel Filter Center Tube
   
   * A new center tube (P/N 23529395) must be installed on the current FFC-113 and FFC-114 fuel filters. Discard former center tube with hole.
5. Insert the O-ring and install bottom fuel filter housing and torque to 33.90– 47.45 N·m (25–35 lb·ft).
6. Pressurize fuel system.
7. Refer to "2.43.3 Leak Checking the Natural Gas Fuel System" for leak checking procedure.