TM 5-3895-342-12
SECTION V. RADIO INTERFERENCE SUPPRESSION
suppression functions which are incidental or
4-7. General
secondary
to
their
primary
function. The
components are the magneto condensor (refer to
Essentially, suppression is attained by providing a
low resistance path to ground for the stray currents.
spark plugs and leads (refer to para 4-25 for
The methods used include shielding the ignition
removal of spark plugs and leads).
and high-frequency wires, grounding the frame with
bonding straps, and using capacitors and resistors.
4-9. Testing of Radio Interference Suppression
Components
4-8. Interference Suppression Component
Test the magneto condensor for leaks and shorts
a. Primary Suppression Components. The
on a suitable tester; replace a defective condensor.
primary suppression components are those whose
If test equipment is not available and interference
primary function is to suppress radio interference.
is indicated, isolate the cause of interference by the
They consist of internal-toothed lockwashers
trial-and-error method of replacing each sup-
installed under the heads and under the nuts of
pression component in turn until the cause of in-
attaching hardware and grounding straps from
terference is located and eliminated.
engine and instrument panel to the frame.
b. Secondary
Suppression
Components.
These components have radio interference
SECTION VI. ENGINE MUFFLER, HOUSING, FLYWHEEL, AND VALVE TAPPETS
4-10. General
The engine is enclosed in a sheet metal housing
consisting of a top canopy, a rear housing panel, a
flywheel housing, two side panels, and a front
panel. The muffler is of the flat baffle type, ex-
tending above the top canopy.
4-11. Muffler
a. Removal. Unscrew the muffler from the
muffler adapter nipple (fig. 4-9A).
Figure 4-9. Engine muffler, top canopy, side doors,
and front panel removal.
Change 1 4-6
