Section VII. MAINTENANCE OF ENGINE HOUSING AND FLYWHEEL

Section VI. RADIO INTERFERENCE SUPPRESSION

4-10. Replacement of Suppression Com-

4-9. General Methods Used To Attain Proper

ponents

Suppression

This equipment uses no primary radio suppression

Essentially, suppression is attained by providing a

components. Replace the shielded spark plug

low resistance path to ground for stray currents.

cables as directed in paragraph 4-15.

The methods used include shielding the ignition

and high frequency wires, and grounding the frame

with bonding straps.

Section VII. MAINTENANCE OF ENGINE HOUSING AND FLYWHEEL

screen in the pulley prevents debris from entering

4-11. Description

the engine. The starter pulley is grooved to

a. The engine housing consists of a blower

facilitate winding the starter rope during starting.

housing that surrounds the flywheel and baffles

which surround the engine cylinder and cylinder

4-12. Engine Housing

head. The large opening in the front of the blower

a. Removal.

housing provides the inlet for the air which cools

(1) Remove the fuel tank, lines, and fittings

the engine. The baffles direct the flow of air around

(para 4-19 a).

the cylinder head and cylinder to provide efficient

(2) Disconnect the spark plug cable from the

engine cooling.

spark plug (para 4-15 a).

b. The flywheel is keyed to the tapered end of

(3) Remove the blower housing and baffles

the crankshaft. It provides the momentum

from the engine as shown in figure 4-1, items 1

necessary to supply continuing crankshaft rotation

through 11.

during the exhaust, intake, and compression

Caution: Do not run engine with the

strokes of the engine. The flywheel is deeply finned

engine housing removed. This will cause

to provide the blower action necessary to circulate

dangerous overheating of the engine since the

the cooling air around the engine. The air is sucked

housing is necessary to direct the flow of

through passages in the starter pulley which is

cooling air around the engine.

mounted next to the flywheel on the crankshaft. A

KEY to fig. 4-1:

Cap screw

Lock washer

Cylinder baffle

Cap screw

Lock washer

Blower housing

Rivet

Engine identification plate

Cap screw

10.

Lock washer

11.

Cylinder head baffle

12.

Screen retainer

13.

Screen

14.

Lock nut

15.

Flat washer

16.

Starter pulley

17.

Flywheel

18.

Key

4-4