Section VIII. MAINTENANCE OF AIR CLEANER, EXHAUST SYSTEM, AND ENGINE HOUSING

TM 5-4320-234-12

Section VII. RADIO INTERFERENCE SUPPRESSION

4-15. Replacement of Suppression Components

4-14. General Methods Used to Attain Proper

Suppression

This equipment uses no primary radio suppression

components. Replace the shielded spark plug cables

Essentially, suppression is attained by providing a low

and ground strap as directed in paragraph 4-35.

resistance path to ground for stray currents. The

methods used include shielding the ignition and high

frequency cables and grounding the frame with bonding

straps.

Section VIII. MAINTENANCE OF AIR CLEANER, EXHAUST SYSTEM,

AND ENGINE HOUSING

4-16. Description

mounted between the muffler and housing to minimize

heat transfer to the housing.

a. Air Cleaner. The air cleaner (fig. 1-1) is

c. Engine Housing. The engine housing protects

mounted on the end of the engine housing opposite the

the engine from the weather, aids cooling by directing

radiator. It is a dry-type unit which uses a porous paper

the air flow around the engine, and provides a mounting

element to screen the particles of dust and dirt from the

for the air cleaner and muffler.

air before the air enters the carburetor. A flexible hose

connects the air cleaner and carburetor.

Proper

4-17. Air Cleaner and Piping

maintenance requires cleaning or replacement of the air

cleaner element when the restriction indicator shows a

NOTE

restricted condition. This occurs when the engine is

running and the clogged condition of the air cleaner

The air cleaner element must be

prevents sufficient air from entering the engine. The

replaced after one year of service or

partial vacuum in the air lines trips the restriction

after it has been cleaned six times,

indicator, indicating the need for servicing or

whichever comes first.

replacement of the air cleaner element.

a. Removal and Disassembly.

Muffler. The muffler (fig. 1-1) is a hollow

cylinder containing internal baffles which break up the

(1)

Remove the air cleaner and related piping,

flow pattern of the exhaust gases expelled by the engine

following the sequence shown in figure 4-4.

to provide quiet engine operation. It is mounted on top

the engine housing and is connected to the exhaust

manifold of the engine by a pipe nipple. A heat shield is

4-11