TM 10-7310-281-13&P
MODERN BURNER UNIT (MBU)
0023 00
UNIT MAINTENANCE PROCEDURES
0023 00-9
Replacing Air/Fill Solenoid Valve . To replace the air/fill solenoid valve (1), remove the air filter from the
threaded end (2) of the solenoid valve as described in 0012.
Disconnect the solenoid valve wiring harness (3) by separating the connector at the end of the harness
assembly.
It may be necessary to grasp the body of the solenoid valve (1) to keep it from turning prior to the next
step. Loosen and remove the retaining screw (4) securing the air/fill solenoid valve (1) to the fuel delivery
block (5) with a flat blade screwdriver. Note the position of the harness exiting the solenoid for proper
reconnection later in the procedure.
A small spring tensioned plunger (6) is located inside the solenoid valve. Take care not to drop the
plunger into the MBU. Carefully remove the solenoid valve assembly (1) by pulling straight out.
Install a new air/fill solenoid valve (1) in the fuel delivery block (5). Be certain that the plunger (6) is
installed in the solenoid body so that the end of the plunger with the spring is inserted into the solenoid
body first. The end of the plunger with the small rubber pad should face out of the solenoid.
The base of the solenoid valve (1) should be flush with the fuel delivery block (5) when properly installed.
Rotate the body of the solenoid so that the wiring harness (4) is oriented as it was prior to removal.
Reinstall the retaining screw (4) through the body of the solenoid and tighten. Reconnect the connector at
the end of the solenoid wiring harness (3). Reinstall the air filter on the threaded end (2) of the solenoid
valve as described in 0012.
Replacement of Air/fill Solenoid Valve
1
3
2
5
6
4
