Figure 4-24. Timing marks on distributor gear and rotor shaft.

gear (8), aline the tooth of the gear marked "RH" with

the timing mark on the rotor shaft gear (17). See figure

4-25.

Figure 4-24. Timing marks on distributor gear and

rotor shaft.

the magneto.

Reassembly is the reverse of

disassembly. Refer to figure 4-23. Note the following:

(1) When installing the rotor bearing (35) in

the magneto frame, position the flat bearing washer in

the bore and position the bearing in the bore against the

washer. Install the expanding washer (34) with the

concave side toward the bearing. Press against the

Figure 4-25. Distributor gear properly alined with

washer to expand it into the groove in the magneto

rotor shaft gear.

frame, locking the bearing in place. Install the bearing

(30) in the rotor bearing plate (28) in a similar manner.

(7) Install the capacitor (4) and preformed

(2) Before installing the bearing plate (27),

packing (5) in the distributor housing. Tighten with a

make sure the flat contact spring on the coil in the

spanner wrench.

Before installing the distributor

magneto frame (38) extends outward from the coil at an

housing on the magneto frame, connect the pigtail from

angle of approximately 20 degrees from vertical. This is

the capacitor to the terminal on the breaker point

necessary to provide spring pressure to hold the

assembly.

distributor gear against the bearing in the distributor

block. Make sure the contact spring is exactly alined

f. Installation. Timing the magneto to the engine

with the bushing in the bearing plate (27).

is a critical procedure. Install the magneto as follows:

(3) When installing the bearing plate (27),

secure the ground lead from the coil in the magneto

(1) Remove the rear spark plug from the

frame under one of the mounting screws (24) that

engine. Put a thumb over the spark plug hole and crank

secures the bearing plate to the frame.

the engine until No.

6 cylinder starts on the

(4) During reassembly, apply one drop of

compression stroke. This is indicated by air being

SAE 20 lubricating oil to the porous distributor gear

compressed against the thumb as the piston rises in the

bushings in the bearing plate (27) and in the distributor

cylinder.

housing (7).

(5) Install and adjust the breaker point

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

assembly (14) as directed in subparagraph b above.

slowly cranking until the DC mark on the flywheel,

(6) This is a "right-hand" magneto-that is,

visible through the timing hole in the housing, is alined

rotation when viewing the impulse coupling end is

with the timing mark pointer. Hold the engine at this

clockwise.

When

installing

the

distributor

setting.

(3) With the magneto still removed from the

engine and mounted in a vise thoroughly lined with soft

cloths, turn the drive lugs clockwise while holding the

high tension lead for No. 6 cylinder (fig. 4-22) close to

the magneto frame so that a spark will arc when the No.

6 lead is energized. When No. 6 lead arcs, the

magneto

4-28