4-14. BURNER HEAD ASSEMBLY. (CONT)
Loosen setscrew (26) securing scanner tube (27) to holder (14) and slip tube from holder.
Repair Burner Head Assembly by replacing any defective components. Inspect holder (14) for breaks,
cracks or damaged threads. Inspect spark plug for burned spots and cracks or breaks in insulation. Inspect
nozzle (15) for cracks, clogs, excessive wear or carbon deposits. Inspect adapter (16), nipple (17) and elbow
(18) for damaged threads. Inspect sight tube (19 through 22) for damaged threads, breaks or cracks in sight
glass (21) and gaskets (22). Inspect close nipple (23), coupling (24), bushing (25), scanner tube (27), nozzle
electrode holder (14) and set screws (26) for damaged threads. Inspect for clogged or obstructed tube.
Wash spark plug (12) with soapy water, rinse in clean water and dry thoroughly.
Use extreme care when cleaning nozzle to avoid damaging orifice tip. Do not
force wire or any metallic object through the nozzle orifice.