Excitation Resistor

prevent shorts which could damage the

exist across the main terminals. Replace the unit if it

alternator, voltage regulator, and other parts.

fails to operate as indicated.

c. Installation. Installation of the reverse polarity

protector is the reverse of removal. Refer to items 20

(1) Disconnect the electrical leads to the starter

through 23 in figure 4-25. If necessary, refer to figure 1-

solenoid switch (6, fig. 3-3).

4 for connection requirements.

(2) Remove the three cap screws (1, fig. 4-26)

4-41. Excitation Resistor

and lock washers (2) that secure the starting- motor (3)

a. Removal.

to the engine side of the flywheel housing; pull straight

CAUTION

forward on the starting motor to remove the assembled

Disconnect the battery cable from the

starter solenoid switch and starting motor from the

positive

battery

terminal

before

engine.

disconnecting any other leads from the

engine components.

This will prevent

shorts which could damage the alternator,

voltage regulator, and other parts.

(1) Disconnect the electrical leads from the

excitation resistor (27, fig. 4-25). Tag leads to facilitate

reassembly.

(2) Remove the cap screw (24), nut (25), and

lock washer (26) that secure the excitation resistor (27)

to the mounting bracket (30). Remove the cap screws

(28) and lock washers (29), and remove the bracket

(30) and spacer (31).

b. Cleaning and Inspection.

WARNING

Clean all parts in a well-ventilated area.

Avoid inhalation of solvent fumes and

prolonged exposure of skin to cleaning

solvent. Wash exposed skin thoroughly. Dry

1. Cap screw

cleaning solvent (fed. spec. P-D-680) used

2. Lock washer

to clean parts is potentially dangerous to

3. Starting motor

personnel and property. Do not use near

Figure 4-26. Starting motor mounting, exploded view.

open flame or excessive heat. Flash point of

solvent is 100 o to 138 F (38 to 59 C).

b. Cleaning and Inspection.

1) Clean the excitation resistor with a cloth

WARNING

dampened with dry cleaning solvent (fed. spec. P-

Clean all parts in a well-ventilated area.

D-680); dry thoroughly.

Avoid inhalation of solvent fumes and

(2) Inspect the excitation resistor for cracks,

prolonged exposure of skin to cleaning

signs of overheating, loose or damaged terminals, and

solvent. Wash exposed skin thoroughly. Dry

other damage.

Use a multimeter to check the

cleaning solvent (fed. spec. P-D-680) used

resistance of the unit. Resistance must be 33 ohms.

to clean parts is potentially dangerous to

Replace the resistor if it is damaged or if resistance is

personnel and property. Do not use near

incorrect.

open flame or excessive heat. Flash point of

c. Installation. Installation of the excitation

solvent is 100 O to 138 O F (38 to 59 C).

resistor is the reverse of removal. Refer to items 24

through 31 in figure 4-25. If necessary, refer to figure 1-

(1) Clean the exterior of the starting motor with

4 for connection requirements.

a cloth dampened with dry cleaning solvent (fed. spec.

4-42. Engine Starting Motor

P-D-680). Take care to prevent solvent from entering

a. Removal.

the starting motor.

(2) Inspect the starting motor for cracks, signs

CAUTION

of overheating, loose solenoid switch mounting,

Disconnect the battery cables from the

damaged pinion teeth on the drive, and other damage.

positive

battery

terminals

before

disconnecting any other electrical leads

from the engine components.

This will

4-44