TM 5-4310-227-15
(1) Install the cock (7) on the idling &-
(4) Remove the screw (1) and nut that
vice (3).
secures the control arm (17) to the
(2) Position the mounting bracket (6) on
throttle shaft (10) and remove the
the intake manifold (5) and secure
control arm.
with the bolt and lock washer.
(5) Remove the cock (7) from the idling
(3) Position the idling device (3) on the
device (3).
mounting bracket (6) and secure with
b. Cleaning and Inspection.
the screws (4) and nuts.
(1) Clean all parts with a cloth damp-
(4) Position the control arm (17) on the
ened with an approved cleaning sol-
throttle shaft (10).
vent and dry thoroughly.
(5) Manually place the governor arm (9)
(2) Inspect all parts for cracks, rust on
in the full speed position. Turn the
the plunger, damaged threads, and
control arm (17) on the throttle shaft
other damage.
(10) until it just touches the plunger
(3) R e p l a c e all damaged or defective
(2) and tighten the screw (1) and
parts.
A d j u s t m e n t (Model
nut.
c. Installation and
BMW-452-ENG-1).
(6) Connect the tube (8) to the cock (7).
Section VII. ENGINE ELECTRICAL SYSTEM
(2) R e m o v e all f o r e i g n matter from
3-43. General
around the spark plug (1, fig. 2-8)
The ignition system provides a properly
and remove the spark plug from the
timed spark to ignite the mixture of fuel and
engine cylinder head (32). Remove
air in the combustion chamber of the engine.
the gasket from the spark plug.
The current is produced by an ignition mag-
c. Cleaning and Inspection.
neto which is composed of an armature, mag-
(1) Clean all applicable parts with a clean
netic rotor, and coil. The timing of this current
c l o t h dampened with an approved
is controlled by the contact points and capacitor
cleaning solvent.
l o c a t e d within the magneto. The ignition
(2) Remove all carbon from the spark
cable conducts the current from the magneto
plug. Use a conventional spark plug
to the spark plug. The engine stop button, lo-
cleaner if available.
cated on the ignition shield, provides a means
of stopping the engine.
(3) Inspect the spark plug for cracks,
breaks, and evidence of excessive
wear.
(4) Replace a defective plug.
a. Testing Ignition for Spark.
(1) Disconnect the ignition cable (3, fig.
d. Adjustment. Set the spark plug electrode
gap to 0.030 inch. Use a feeler gage to measure
(2) Hold the ignition cable one-eighth
the gap. If the gap is too large, bend the outer
inch from any metal part of the en-
electrode to the proper gap setting.
gine.
R o t a t e the engine with the
starter rope .If a spark jumps the
Caution: Never attempt to adjust the center
electrode. This will crack the insulating per-
gap, the ignition system is function-
ing properly.
celain, damaging the spark plug.
(3) If the spark is weak or if there is no
e. Installation.
spark, inspect the ignition system for
defective components.
(1) Install the gasket on the spark plug
b. Removal.
(1) and install the spark plug in the
(1) Remove the air shroud cover (para 3-
cylinder
head (32). Torque the
spark plug to 24 to 26 foot-pounds.
