Installation - TM-5-4320-234-120067

the breaker points open and close properly as the

remove the end cap (12) and gasket (13) to provide

magneto cam rotates.

easy access to the breaker points.

(12) Position the gasket (13) and end cap (12)

(4) Remove the retaining ring (14) and remove

on the magneto case and secure with four screws (10

the movable contact (15) from the pivot.

and 11).

(5) Remove the terminal screw (16), and

(13) Check the distributor rotor (8) for cracks,

disconnect the leads and the primary ground spring (17).

worn mounting hole, and burned contacts. If defective,

(6) Remove the screw (18) and washer (19)

use a new rotor. Install the rotor spring slip (9) and

that secure the one end of the stationary contact (23) to

rotor.

the magneto. Remove the screw (20), washer (21), and

(14) Inspect the distributor block (6) and cable

cam wick (22). Remove the stationary contact from the

outlet knobs (1) for cracks, arc paths, burned terminals,

magneto.

and other damage. Replace if defective. Install a new

(7) Apply a light coat of grease on the magneto

brush and spring (7) and the distributor block on the

cam. Position the stationary contact of the new breaker

magneto with four screws (5).

point set on the magneto bearing support; secure by

(15) Install a new preformed packing (4) on a

installing the cam wick (22), screw (20), and washer

new capacitor (3) and secure with two screws (2). The

(21). Install the screw (18) and washer (19), but do not

rear terminal of the capacitor must contact the primary

tighten.

ground spring (17).

(8) Position the movable contact (15) of the

c. Installation. Timing the magneto to the engine is

new breaker point set on the pivot on the bearing

support; secure with the retaining ring.

a critical procedure. Install the magneto as follows:

(9) Install the primary ground spring (17) and

(1) Remove the rear spark plug from the

the leads with the terminal screw (16).

engine. Put your thumb over the spark plug hole and

(10) Crank the engine so that the cam follower

crank the engine until No. 6 cylinder starts on the

of the movable contact is on the high portion of the cam.

compression stroke. This is indicated by air being

Insert a feeler gage between the contact points. The

compressed against your thumb as the piston rises in

required contact gap is 0.015 inch. Adjust the position

the cylinder.

of the stationary contact (23) to provide the required

(2) Set the piston on top-dead-center by slowly

point gap when the cam holds the contacts fully open.

cranking until the DC mark on the flywheel (2, fig. 4-22),

Tighten the screw (18) to secure the adjustment. Check

visible through the timing hole (1) in the housing, is

that screw (20) is also tight.

aligned with the timing mark pointer. Hold the engine at

(11) Rotate the magneto shaft to check that

this setting

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