Muffler and Exhaust Pipe

e. Installation. Install muffler in reverse order

described above.

Note. Make sure there is at least 1 inch clearance

between muffler and muffler guard.

3-80. Manifolds

a. General. The manifold consists of two duct works,

the intake and exhaust. The intake manifold is arranged

to give an equal quantity of a gasoline and air mixture,

to each cylinder. The exhaust manifold is routed so as

to heat the intake manifold and discharge the exhaust

gases from each cylinder to a common outlet.

b. Inspection. Inspect for leaks, cracks, and missing

or loose parts.

c. Removal.

(1) Refer to paragraph 3-79d and remove the

muffler.

(2) Refer to figure 3-10 and remove carburetor.

(3) Refer to figure 3-17 and disconnect the fuel

primer lines.

(4) Refer to figure 3-59 and remove manifold.

d. Installation. Install the manifolds in reverse order

of removal.

3-81. Housing Assembly

a. General. The engine is enclosed in a sheet metal

Figure 3-56. Valve clearance adjustment.

housing. The two side panels are removable to provide

access to the engine and its components.

The

just starts to open on cylinder number 1, adjust valve

instrument panel is mounted at the rear end of the

tappets on cylinder number 4.

engine, in which are mounted the controls and

(4) Check to be sure all locknuts are secure.

instruments necessary to run the pumping unit. The

Inspect valve retainers, spring, and rocker arms for

instrument panel is covered by an access door.

wear.

b. Removal.

d. After valves are adjusted install all parts removed

(1) Refer to figure 8-1 and remove lifting bail by

in reverse order as described above.

removing nuts (9) and lockwashers (8).

3-79. Muffler and Exhaust Pipe

(2) Refer to paragraph 3-79d and remove muffler

a. General. The muffler is mounted on top the

guard and muffler.

housing, and is covered by a muffler guard. The

(3) Remove side panels. (fig. 3-60).

purpose of the muffler is to muffle exhaust sound and to

(4) Refer to figure 3-60 and remove capscrews (7),

prevent any sparks from reaching the open air.

lockwashers (8), and hood (9).

b. Inspection. Inspect muffler and exhaust pipe for

(5) Refer to paragraph 3-50b(6) and remove fan

leaks, cracks, dents, missing or loose parts.

guard.

c. Service. Refer to figure 3-58 and clean out carbon

(6) Refer to figure 3-60 and remove capscrews (11

deposits.

& 20), lockwashers (12 & 19), and sides (10 & 18).

d. Removal.

(1) Refer to figure 3-57 and remove muffler guard.

(2) Refer to figure 3-58 and remove muffler.

3-47