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5.2.2.4
Carburetion.
5.2.2.4.1 Air Cleaners.
A properly serviced air cleaner protects the internal parts of the engine
from dust particles in the air.  If the air cleaner instructions are not
carefully followed, the dirt and dust which should be collected in the
cleaner will either be drawn into the engine and become a part of the
oil film, or will choke the engine, causing an excessively rich mixture.
Either condition is very detrimental to engine life; dirt in the oil forms
an abrasive mixture which wears the moving parts instead of protecting
them. No engine can stand up under the grinding action which takes
place when this occurs.  A choked off air cleaner can cause raw gasoline
to wash oil off the cylinder walls, thereby causing poor lubrication.  The
air cleaner on every engine brought in for a check up or repair should
be examined and serviced.  If the cleaner shows signs of neglect, show
it to the customer before cleaning and instruct him on proper care to
assure long engine life.
NOTE: REPLACE AIR CLEANER GASKETS AND MOUNTING GASKETS
THAT ARE WORN OR DAMAGED, TO PREVENT DIRT AND DUST EN -
T E R I N G ENGINE THROUGH IMPROPER SEALING. STRAIGHTEN OR
REPLACE BENT MOUNTING STUDS.
Cleaning Fuel System.
5.2.2.4.2
Gummy or dirty fuel tanks, lines and carburetors should be cleaned in a
carburetor cleaner, such as Bendix.  Do not use acetone or soak parts
for extended periods.  Do no soak diaphragms or plastic parts in cleaner.
Carburetors.
5.2.2.4.3
Before removing any carburetor for repair, look for signs of air leakage
of mounting gaskets that are loose, have deteriorated, or otherwise damaged.
Note position of governor springs, governor link, remote control, or other
attachments to facilitate reassembly.  Do no bend the links or stretch the
spring.
5.2.2.4.4 Carburetor and Tank Assembly.
Remove the carburetor and fuel tank as one unit, being careful not to bend
the governor linkage.  After removal of the carburetor from the fuel tank,
inspect the tank for deposits of dirt and/or varnish.
58

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