Figure 4-15. Distributor, installed.

TM 10-3930-627-12

1. Suppressor

2. Distributor cap

3. Secondary lead

4. Primary lead

5. Clamp

Figure 4-15. Distributor, installed.

b. Removal.

(1) Disconnect primary lead (4, fig. 4-15) at

1. Rotor

coil and remove secondary lead (3) with suppressor (1)

2. Screw

from the distributor cap (2).

3. Screw

(2)

Remove spark plug cables from

4. Lock washer

distributor cap, noting position of No. 1 cable for

5. Condenser

installation.

6. Contact set

(3) Remove the cap and mark the position

Figure 4-16. Distributor, partly exploded view.

of the rotor in the distributor to facilitate installation. Mark

e. Installation. Reverse procedure in b above

the position of the distributor on the engine block for

and use timing light or static method to determine proper

timing mark on installation of assembly. The firing order

timing (f below).

is 1-3-4-2 in counterclockwise direction looking from the

f. Ignition Timing.

top of the distributor.

(1) Static method. Chalk the timing mark

(4)

Loosen clamp (5) that secures

on the flywheel so the mark can be seen clearly. Remove

distributor to the engine cylinder head.

No. 1 spark plug and place thumb over spark plug hole.

(5) Remove distributor assembly from the

Crank engine until air escapes around thumb. Continue

engine cylinder head.

cranking to align the top- dead-center timing mark with

(6) If necessary, remove the distributor

pointer. Loosen distributor clamp (5, fig. 4-15) and turn

drive shaft from the engine block. Cover the hole in the

the distributor clockwise on its mounting until the contact

engine cylinder head to prevent foreign matter from

points just begin to open. Tighten clamp to secure

entering the block.

adjustment. Replace secondary lead.

c. Disassembly.

(2) Timing light method. Attach a timing

(1) Remove rotor (1, fig. 4-16) from the

light lead to No. 1 spark plug. Connect the other timing

shaft.

light lead as shown in figure 4-17. Connect tachometer

(2) Remove contact set mounting screw (2)

and run engine at 500 rpm. The No. 1 plug should fire

and remove contact set (6).

at top-dead-center. The light should flash each time the

(3) Remove condenser mounting screw

top-dead-center mark on the flywheel passes the pointer

(3), lock washer (4), and condenser (5) from the

on flywheel cover. If adjustment is necessary, loosen the

distributor.

clamp nut and turn the distributor at its mounting. Rotate

(4) Remove distributor primary lead and

the

grommet through the inside of the distributor.

d. Assembly. Reverse procedure in c above

and adjust points (g below).

4-21