Section IX. ENGINE
82. Description and Function
d. Position new gaskets and the
covers on the block; secure with the nuts and gaskets.
a. The internal combustion, L-head, gasoline
engine is mounted on the pumping unit skids. The
84. Muffler and Exhaust Pipe
engine is housed by top, side, and end panels. A port is
provided in the top panel for the exhaust pipe.
b. The combustible mixture of gasoline and air
(1) Remove the four screws (3, fig. 41) and
flows from the carburetor, through the intake manifold,
lock-washers (4) that secure the muffler
into the combustion chamber. Flow of the mixture into
guard (2) to the top hood (1); remove the
the combustion chamber is controlled by the intake
valves. The intake valves are operated by adjustable
(2) Remove the clamp (3, fig.
tappets which ride the lobes of the cam.
secures the muffler (2) to the exhaust
pipe (5). Remove the screw and open the
c. After the combustible mixture has been burned
clamp of the muffler mounting bracket
in the cylinder, the exhaust valves open and the exhaust
Remove the muffler from the
gases are forced into the exhaust manifold.
exhaust pipe and from the bracket.
Operation of the exhaust valves is controlled by tappets
(3) Remove the four scre s (13) that secure
which ride the lobes of the cam.
the bracket to the engine hood; remove
the bracket and spacers (12).
d. Exhaust gases are carried from the exhaust
(4) Loosen the screw on the weather cap (1)
manifold to the atmosphere through the exhaust pipe
and pull the weather cap from the muffler.
and muffler. The muffler quiets the noise of the engine.
(5) Use a pipe wrench to remove the exhaust
pipe (5) from the exhaust flange (6);
83. Valve Tappet Adjustment
remove the exhaust pipe and rain shield
a. Operate the engine at fast idle until it reaches
(6) Remove the four nuts (10) and washers
(9) that secure the exhaust flange (6) to
b. Remove the four nuts (91, fig. 56) and gaskets
the exhaust manifold; remove the flange
(92) that secure the valve chamber covers (76 and 90)
(6) and gasket (7).
to the block (28); remove the covers and gaskets (75).
c. Set the intake valve tappet clearance at 0.017
b. Cleaning and Inspection.
inch and the exhaust valve tappet clearance at 0.020
(1) Clean the parts in an appro d cleaning
inch as shown in figure 38. The second, third, fifth,
solvent; dry with clean, dry compressed
eighth, tenth, and eleventh valves, starting from either
air. Scrape carbon deposits from the
end of the engine, are intake valves. The remainder are
(2) Inspect the parts for holes, thin spots,
heavy deposits, stripped threads, cracks,
breaks, or other damage.
Installation of the muffler and
exhaust pipe is the reverse of the removal procedure
described in a above.
(1) Loosen the hose clamps (2 and 4) and
remove the hose (3). Remove the stack
Figure 88. Valve tappet adjustment.
(2) Loosen the hose clamps (13 and 15) and
remove the hose (14) from the air valve
(5) to the air cleaner.