A R M Y
TM 5-6115-612-12
MARINE CORPS TM 6115-12/7
AIR FORCE
TO 35C2-3-471-1
NAVY
AG-320B0-0MM-000
4-46. HIGH TENSION LEAD. (cont)
d. Installation. (cont)
(4) Connect battery cable plug
connector to battery.
(5) Install engine housing access
cover and plenum access cover. Secure
with turnlock fasteners.
4-47. SPARK IGNITER.
Maintenance of
the spark Igniter (1, figure 4-31) is
limited to test, Inspection, service
and replacement.
a. T e s t.
Test spark igniter in
accordance with paragraph 4-45.
b. Removal.
(1) Loosen turnlock fasteners and
remove engine housing access cover.
WARNING
To prevent injury, ensure that
battery cable plug connector is
disconnected from battery before
performing maintenance.
(2) Disconnect battery cable plug
connector from battery.
WARNING
High voltage may exist in igni-
tion system even though generator
set is shut down.
To prevent
injury,
ensure
that
ignition
system components are discharged
t o
ground
before
performing
maintenance.
(3) Disconnect high tension lead
(9) from spark igniter
(1) and
discharge to ground.
(4) Remove
spark
igniter
(1),
washer (2), and metal gasket (3) from
combustor housing.
c.
Inspection.
CAUTION
To prevent damage, do not attempt
to remove deposits or residue
from the firing end. Spark igni-
ter
utilizes a
semiconductor
material at the firing end that
can be damaged through improper
cleaning.
(1) If necessary, carefully brush
firing
end with stiff-bristled non-
metallic brush, or carefully wipe with
P-D-680 and cloth.
(2) Use
dry
cloth or
fiber
bristle brush to remove residue from
exterior of spark igniter shell.
(3) Inspect
spark igniter for
electrical or thermal damage. Replace
if damaged.
(4) Inspect threads for damage.
Replace spark igniter if damaged.
(5) Inspect
thermal
well
for
cracked or
loose ceramic.
Replace
spark igniter if damaged.
(6) Inspect firing end insulator
for
chips,
grooves,
and
cracks.
Replace spark igniter if damaged.
(7) Inspect mounting flange for
damage.
(8) Inspect electrode for exces-
sive erosion.
See figure 4-32. Compare
electrode with electrode on new spark
igniter.
If electrode has eroded more
than 50%, replace spark igniter.
4-104
