TM 10-4520-259-13&P
c.
Soak nozzle (15) and adapter (16) in solvent. Dry all parts thoroughly.
d.
Wash sight glass (21) in soapy water, rinse in clean water and dry thoroughly.
e.
Wash scanner tube (27) in solvent to remove deposits in tube and dry thoroughly.
INSTALL
a.
Screw close nipple (23) and bushing (25) into coupling (24) by turning clockwise.
b.
Screw scanner tube (27) into bushing (25). Insert scanner tube (27) into holder (14) and tighten set
screws (26).
c.
Assemble two gaskets (22) and peep sight glass (21) and insert into peep sight cap (19), then screw in
nipple (20).
d.
Install nipple (20) in holder (14) by turning clockwise.
e.
Install elbow (18) on nipple (17) and screw into holder (14) and tighten set screws (28).
NOTE
Spark plugs are designated left handed and right handed. Be sure to install spark
plug in correct position.
f.
Place gasket (13) over electrode and install spark plug (12). Repeat procedure for other spark plug.
g.
Screw nozzle adapter (16) to end of nipple (17) and install nozzle (15) onto nozzle adapter (16).
h.
Bend spark plug electrodes (29) until spark gap is 5/32 inch (4mm) and electrodes are located 1/8 inch
(13mm) outward and 1/2 inch (13mm) upward from hole in burner nozzle. See figure on page 4-26.
i.
Install burner tube (7) and gasket (10) in water heater (11) using four washers (9) and nuts (8). Tighten
nuts.
j.
Install nozzle and electrode assembly (6) in burner tube (7) using three washers (5) and three nuts (4).
Tighten nuts.
Change 2 4-25
