(5) Remove the nozzle assembly (11) and
adapter (7) from the holder.
(6) Remove the electrode (6) and lock
washer (4) from the head.
(7) Remove the three screws (16) and washer
(15) securing the chamber (1) and gasket (2) to the
head. Remove the gasket and chamber.
Dry cleaning solvent, P-D-680 or P-S-
661, used to clean parts is potentially
dangerous to personnel and property.
Use in a well-ventilated area as the
fumes are dangerous if inhaled. Avoid
repeated and prolonged skin contact.
Do not use near open flame or
excessive heat. Flash point of solvent
is 100F.-138F. (38C.-59C.).
c. Cleaning, Inspection and Repair. Clean all parts
in a cleaning solvent. Inspect the spark plug and
electrodes. Inspect the plug for cracked or broken
porcelain. Replace the plug if damaged. Inspect for
worn electrodes. Replace ground electrode if worn.
Inspect the spray nozzle for cracks, burrs, broken
screen, or any other damage and replace if damaged.
Inspect for damaged threads and gaskets. Replace all
damaged hardware and gaskets.
When the spark plug and the ground electrode are
installed, the gap between the two should be 3/16
(0.188) to 1/8 (0.125) inch (.4775 -.3175 cm).
Reverse the disassembly
procedures in b. above to reassemble the combustion
e. Installation. Reverse the removal procedures in
a. to install the combustion head.
f. Spark and Plug Gap Testing
(1) Disconnect the solenoid wire by removing
the machine screw (20, fig. 4-106) and lifting the wire
out of position to shut off the fuel supply.
(3) Remove the head assembly with plug wire
Machine bolt 11.
(4) Start the unit and check the spark for
Filter head 13.
intensity (it should be a vivid blue in color). Check the
spark plug gap (3/16 (0.188) to 1/8 (0.126) inch (.4775-
Figure 4-109. Fuel filter, exploded view.
(6) Install the fuel tube and solenoid lead.
g. Spray Nozzle Test. Remove the nozzle holder
(3) Remove the nut from the bail.
from the head and with the fuel pump working check the
(4) Lift the nozzle holder (10) and packing
angle of fuel spray. It should be 600 to 1200 with a
(12) from the head.
uniform cone. If the spray angle is not