TM 54320-218-15
(7) Position the end cap on the magneto
housing, and secure the end cap and
ground strap (2, fig. 18) with the
four screws (10) and lockwashers.
67. Spark Plug Cables
a. Removal.
(1) Tag all spark plug cables so that they
will be reinstalled on the same spark
p l u g s (the cables are different in
length ).
Lift out the gaskets (17), and plug the spark
(2) Disconnect the cables from the mag-
plug holes with corks or wooden pegs.
neto and spark plugs. Remove the
b. Cleaning and inspection.
screws that secure the clips to the air
(1) Wipe the exterior of the spark plugs
shrouds; remove the cables and loom
clean with a cloth dampened with an
assemblies from the engine.
approved cleaning solvent.
b. Cleaning and inspection.
(2) Examine the firing ends of the plugs,
Wipe the cable and loom assemblies with a
n o t i n g the type of deposit. Wet,
cloth dampened with an approved cleaning sol-
sludgy deposits indicate excessive
vent. Inspect the cable sheathing for breaks.
clearance between the valve guides
Examine the loom assemblies for corrosion. Re-
and stems, or that excessive amounts
place any defective spark plug cables.
of oil are entering the combustion
c. lnstallation. Connect the spark plug ca-
chamber through worn rings. A dry,
oles to the spark plugs and magneto. Install
fluffy deposit indicates incomplete
the clips.
combustion; check the magneto and
s p a r k plug cables for defects that
68. Spark Plugs
w o u l d result in too cold a spark.
a. Removal. Disconnect the cables assem-
Burned or overheated plugs are indi-
blies from the spark plugs. Blow out the spark
cated by a burned insulation nose
plug wells in the cylinder heads, and remove
around the center electrode and badly
eroded electrodes. C h e c k the air
the spark plugs with the spark plug wrench.