MODERN BURNER UNIT (MBU)
UNIT MAINTENANCE PROCEDURES
FUEL DELIVERY BLOCK ASSEMBLY
THIS SECTION COVERS:
MBU shut-down, cool, and disconnected from power source (WP 0005)
Fuel tank drained (WP 0011)
Tools and Special Tools
Shop Equipment Automotive Maintenance and Repair: Organizational Maintenance, Common No. 1
(WP 0038, Table 2, Item 2)
This procedure contains information and instructions to keep the MBU in good working order by
inspecting and replacing the air filter, fuel shut-off solenoid valve, air/fill solenoid valve, ignitor, flame
sensor, fuel nozzle, needle valve, controller knob and spring, delivery block, nylon nuts, washers, and
mounting screws, or the entire fuel delivery block assembly.
Two Person Lift
The MBU weighs approximately 58 pounds fully fueled (26.3 kg). Two persons must carry the
fully fueled MBU, lifting with legs, not back, to prevent injury.
Inspect the fuel delivery block assembly for damage to individual components, including leaking or loose
fuel hoses and frayed or loose power leads, damage to the solenoids, flame sensor, ignitor, and air filter.
Check the control knob for free movement.
Fire / Fuel Contamination
Before proceeding with this procedure, the MBU fuel tank must be drained completely as
described in work package 0011. Have rags on hand to clean up fuel spillage that may occur
to prevent contamination. Do not perform this procedure near an open flame to prevent fire.