Section VI. FUEL SYSTEM
Allow excess oil to drain from the filter
107. Description
element.
The fuel system on the lubrication unit engine
(3)
Inspect the filter element for tears or
consists of a nine gallon capacity fuel tank, a connecting
worn condition. Replace if necessary.
fuel line to the diaphragm-type fuel pump, a dry-type air
(4)
Thoroughly clean the air cleaner body
cleaner, a down-draft carburetor, a fuel filter, and a fuel
and cover, using an approved
pump priming control, used to prime the engine. An
cleaning solvent.
externally adjustable governor, attached to the
carburetor throttle by a governor linkage, regulates the
(5)
Inspect the unit for dents, cracks, or
engine speed by increasing or decreasing the fuel
wear.
Replace the air cleaner if
mixture. The carburetor has main and idle adjusting
necessary.
needle valves. The main adjusting needle setting
d.
Reassembly and Installation.
determines the air-fuel mixture ratio at all load
conditions. The idle adjusting needle affects operation
(1)
Install the air cleaner body (3) on the
at light load or idle conditions, but does not alter the
carburetor, and secure by tightening
airfuel mixture. The dry-type air cleaner is used in
the clamp screw (4).
conjunction with a carburetor air heater duct attached to
(2)
Position the filter element (2) in the
the muffler. The top of the air cleaner may be rotated,
body (3) and install the cover (1).
so the opening is in alinement with the heater duct, so
(3)
Secure the cover to the body by
air, heated by the muffler, will pass directly into the air
tightening the thumb screw (13).
cleaner for cold weather operation of the engine.
109. Fuel Filter
108. Air Cleaners
a.
Removal.
a.
Removal.
(1)
Disconnect the fuel line (3, fig. 19) to
(1)
Loosen the screw (4, fig. 18) and
the fuel filter body (2).
clamp (12) which secure the air
cleaner (6, fig. 6) to the carburetor.
(2)
Disconnect the fuel line fitting (8) from
the connector fitting (11) at the fuel
(2)
Remove the air cleaner from the
filter body (2).
carburetor by lifting the unit up and
away from the carburetor.
(3)
Remove the two screws (4) which
secure the fuel filter bracket to the
b.
Disassembly.
frame, and remove the fuel filter from
(1)
Loosen the thumbscrew (13, fig. 18)
the unit.
which secures the cover (1) to the
b.
Disassembly.
body (3).
(1)
Unscrew the mounting bracket and
(2)
Remove the filter element (2) from
fuel fitting unit from the fuel filter body
the body.
(2).
c.
Cleaning, Inspection, and Repair.
(2)
Unscrew the connector fitting (11)
(1)
Clean the filter element, using an
from the fuel filter body.
approved cleaning solvent.
(3)
Loosen the thumbnut (1) and clamp
(2)
Allow the filter element to dry, and dip
(10) from the fuel filter bowl (6).
in oil of the recommended viscosity.
(4)
Remove the bowl, gasket (7) and
1
Air cleaner cover
6
Speed reduction shutoff cock
10
Governor speed adjusting nut
2
Filter element
7
Fuel line
11
Crankcase breather
3
Engine air cleaner body
8
Adjusting screw locknut
12
Mounting clamp
4
Clamp screw
9
Oil pressure relief adjusting screw
13
Thumbscrew
5
Choke linkage
Figure 18. Servicing and removal of air cleaner.
48