Magneto - TM-5-4320-240-150053

f. Repair.

If the magneto has been found

c. Removal

Refer to figure 8-22 and remove

defective refer to figure 3-26 and repair the magneto by

starting motor.

installing the magneto repair kit.

g. Timing and Installation. Refer to figure 3-25

d. Cleaning.

and install the magneto observing the following special.

Instructions,

(1) Clean the outside of the starting motor

with a cloth dampened with cleaning solvent; wipe dry.

(1) As a preliminary to magneto timing the

Take care that solvent does not enter the starting motor

breaker points must be set for a . 01d inch gap.

or contact the electrical parts.

Magneto & may be held in place by four capscrews, and

connected to the drive shaft through an adjustable

(2) Inspect the assembled starting motor for

coupling with impulse device for easy starting. To time

cracks, breaks, broken or worn gear teeth. Refer to

the magneto, crank the engine until No. 1 cylinder is

figure 3-23 and remove band (16), inspect brushes (11),

moving upward on the compression stroke. As the

brush holders (12), and springs (13). Make sure that

piston approaches the top of the cylinder, here will come

they are clean and operating freely. Inspect lead (6)

into view on the flywheel, a mark "Mag" or "Fire". When

and make sure it is well insulated.

this is directly under the fixed pointer attached to the

engine, the engine has reached the point at whit. . the

f. Repair-. If the starting motor has been found

spark should occur. With the engine in this position,

defective and can be corrected with at repair kit refer to

release the screws holding the adjustable part of the

figure 3-2,3 and repair the starting motor.

coupling so that the magneto is positively disconnected

from the drive shaft. Then remove the interrupter cap

g. Installation Refer to figure 3-22 and install the

and distributor plate from the magneto, and turn the

starting motor.

magneto shaft until the distributor brush is in line with

the distributor segment marked by the figure "1" on the

3-46. Magneto

face of the distributor plate. Continue to turn the

a. General.

The magneto is of the rotating

magneto until the impulse snaps, then turn it backwards

magnet, high-tension type designed to provide radio

until It points open and close, then bring It forward until

shielded ignition. It has an impulse coupling which

the breaker points are just beginning to separate; this is

assists starting by automatically retarding the ignition

the firing position for cylinder number '1. This is the

spark during the starting operation.

position at which the magneto should be coupled to the

engine. Replace the distributor block and cap over the

b. inspection Check magneto for tight connections

breaker box.

and well insulated wiring. Inspect mounting and ground

bolts.

3-47. Spark Plugs and lgnition Leads

a. Spark Plug Service and Replacement.

c. Adjustment.

Refer to figure 3-24 and adjust

magneto points.

(1) Ioosen the nuts that secure the shielded

ignition leads to the spark plugs; disconnect the leads.

d. Removal. Refer to figure 3-25 and remove the

(2) Clean around each spark plug with a

magneto.

clean cloth and compressed air. Remove the spark

plugs with a deep-well socket wrench or a spark plug

e. Cleaning and Inspection.

wrench.

(3) Clean the plugs with a spark plug sand

(1) Clean the outside of the magneto with a

blaster. Set the plug gap at 0. 025 inch.

cloth dampened with cleaning solvent; wipe dry. 'rake

(4) Inspect the spark plugs for cracked or

care that solvent does not enter the magneto or contact

eroded porcelain, burned electrodes, damaged threads,

the electrical parts.

or other defects. Test the spark plugs on a spark plug

tester. Replace defective spark plugs.

(2) Inspect the magneto for cracks, breaks,

(5) Install spark plugs in the cylinder head.

worn or broken gear teeth, or other damage. Remove

and inspect the distributor head for carbon runners,

(6) Connect ignition leads

damage, or evidence of failure.

3-24