Section VIII. ENGINE COOLING AND EXHAUST SYSTEMS

Figure 3-17. Belt set, removal points.

Figure 3-18. Air shroud, flywheel starting pulley assembly, and cylinder head, exploded view.

TM-5-4310-227-15 Compressor Reciprocating: Air; Gasoline Engine 15 CFM 175 PSI; Receiver Mounted (Champion Pneumatic Model OEG-458-ENG-1) Manual
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TM 5-4310-227-15

ENGINE COOLING AND EXHAUST SYSTEMS

Section VIII.

secure the backet (27) to the air

3-53. General

shroud (12).

The engine is forced-air-cooled from a blow-

(f) Remove the two capscrews (25, fig.

er integrated with the flywheel. An air shroud

3-18) that secure the inside rear

incloses the top and three sides of the engine

of the air shroud (22) to the front

cylinder with an intake opening at the blower.

of the cylinder and crankcase as-

Air from the blower is forced around and over

sembly (17).

the top of the engine to dissipate the heat. The

(g) Remove the four screws (35, fig.

exhaust system, which is composed of a muffler

2-8) and lockwashers (34) that se-

and fittings, provides a means of releasing the

cure the air shroud (36) to the rear

exhaust gases to the atmosphere. Refer to TM

and sides of the cylinder and crank-

5-2805-203-14 for data applicable to Model

case assembly (19 ) and remove the

OEG-458-ENG-3.

air shroud.

(h) Remove the four sheet spring nuts

3-54. Air Shroud, Cover, Rim, and Screen

(1, fig. 3-12) from the f ront of the

air shroud (4).

a. Removal.

(i) Remove the screw (21, fig. 3-2),

(1) Air shroud cover.

l o c k w a s h e r , and nut that secure

(a) Remove the ignition cable (para 3-

the air cleaner bracket clip (20) to

the air shroud (22). Remove the

(b) Remove the nut (3, fig. 2-8) and

bracket clip.

lockwasher (5) that secure the air

b. Cleaning, Inspection, and Repair.

shroud cover (2) to the cylinder

(1) Clean the air shroud, cover, rim and

head stud (4).

screen with an approved cleaning sol-

(c) Loosen the screw (9, fig. 3-2) that

vent and dry thoroughly.

secures the air shroud cover (7) and

(2) Inspect all applicable parts for dents,

shroud (22 ) to the side of the cylin-

cracks, breaks, and other damage.

der head (6) and remove the cover

(3) Inspect all threaded parts for dam-

and stud spacer from the engine

aged threads.

cylinder head.

(4) Repair or replace all defective parts

(2) Rim and screen.

as necessary.

(a) Remove the starting pulley (para 3-

c. Installation.

(1) Air shroud.

(b) Remove the four screws (2, fig. 3-

(a) Secure the air cleaner bracket dip

1 1 ) that secure the rim (5) and

(21, fig. 3-18) to the air shroud

screen (6) to the air shroud (1).

( 2 2 ) with the screw (19),lock-

Remove the rim and screen.

washer (31), and nut (30).

(3) Air shroud.

(b) Position the four sheet spring nuts

(a) Remove the engine flywheel (para

(23) on the air shroud.

(c) Position the air shroud on the cyl-

(b) Remove the intake manifold (para

inder and crankcase assembly (17)

and install the four screws (32)

(c) Remove the air shroud cover (see

and lockwashers (31) that secure

(1) above).

the air shroud to the rear and sides

of the cylinder and crankcase as-

(d) Remove the screws (3, fig. 3-16)

sembly.

that secure the starter guard to the

air shroud.

(d) Install the two capscrews (25) and

lockwashrs (24) that secure the in-

(e) R e m o v e the screws (26, fig. 3-

side rear of the air shroud to the

1 4 ) , lockwashers, and nuts that

3-45

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