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ENGINE RUNS BUT LACKS POWER - TM-5-4320-234-120040
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TM-5-4320-234-12 Pump Centrifugal Self-Priming Gasoline Engine Driven Wheel Mounted 6-Inch 1500 GPM Capacity At 60 Foot Head Manual
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Figure 4-4. Air cleaner and piping, exploded view.
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.
b.
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

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