TM 5-3810-28-12
1. Capscrew, cover
11.
Plug
21.
Capscrew
2. Washer
12.
Gasket
22.
Washer
3. Cover
13.
Gasket
23.
Pipe
4. Spring
14.
Base
24.
Capscrew
5. Gasket
16.
Plug
26.
Capscrew
6. Element
16.
Gasket
26.
Plug
7. Pipe
17.
Washer
27.
Washer
8. Bushing
18.
Capscrew
28.
Spring
9. Plate
19.
Plug
29.
Piston
10. Housing
20.
Capscrew
50 degrees on either side of vertical. This adjustment
flange leak to completely alter engine performance. An
should never have to be repeated or checked. Then
adjustment under these circumstances can not be done
adjust the control tension setscrew so that the throttle
properly. Also, the fuel tank must be suspected as a
lever holds firm in any desired position.
cause of trouble before adjusting the carburetor. An
unusual amount of fuel contamination may partly block
(2) Repair. The flexible control cable from the hand
the tank outlets or fuel lines, causing the carburetor to be
throttle lever is attached at the opposite end to the
starved for fuel. Under these circumstances, the fuel
engine speed governor lever. Refer to figure 3-33.
tank must be drained and cleaned (para. 3-13) before
Remove necessary cable damps and remove the flexible
adjusting the carburetor. If the air cleaner oil is not
control cable, figure 3-37. In- stall a new control cable.
clean, is of the wrong type, or is filled too full it will restrict
Attach to the lowest hole on the governor lever. Attach
air flow to the carburetor, making it appear that the
to the second hole from the end of the throttle lever.
carburetor needs adjustment. All of these items must be
h. Engine Choke Control Cable Replacement.
checked before adjusting the carburetor. Refer to figure
Refer to figure 3-38 and replace any defective
components of the engine choke control.
i. Engine Starting Aid Pump and Lines.
and remove and replace the carburetor.
remove and replace the starting aid pump fittings.
c. Speed Governor- Adjustment and Replacement.
replace any damaged starting aid fuel lines or fittings.
engine speed governor.
j. Air Cleaner. Refer to figure 3-39 and replace
the engine air cleaner.
and replace the engine speed governor.
d. Fuel Pump Replacement. Refer to figure 3-35 and
3-43. Engine Rocker Arm-Tappet Adjustment
replace the fuel pump.
e. Fuel Sediment Bowl. The fuel sediment bowl is a
a. General. The tappets on this engine are to be
portion of the fuel pump, but is treated separately
adjusted when the engine has set idle for a period of
because it can be serviced separately. Refer to
time so that it has cooled to the temperature of the
surrounding air. They can not be accurately set if the
f. Fuel Tanks, Lines, and Fittings.
rocker arms are hollowed out by contact with the valve
(1) Repair. Clean all accessible items shown in
pushrods. If inspection reveals hollowed out rocker
arms, report the condition to proper authority.
b. Adjustment. Adjust as follows:
any damaged item.
(1) Remove the spark plugs from the engine so that
g. Engine Throttle Control.
it can be turned to the required crankshaft positions.
(1) Adjustment.
Adjustable setscrews are located
(2) Refer to figure 3-40 and remove the valve tappet
beneath the cover plate in figure 3-37. Adjust these
cover.
setscrews so that the throttle lever will move through an
approximate 100 degree arc,
3-33
