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HOLE PLUG

Fig. lO

=Magneto Breaker Point Adjustment’. If this does not

remedy the trouble, it may be necessary to install a

new condenser. See Magneto Manufacturer’s Mainte-

nance Instructions in back of this manual.

FIRING ORDER

’The firing order of the cylinders is 1-3-4-2, and the

magneto and battery type distributor rotate at one-half

engine speed, as is the case with conventional =in

line" engines. The intervals between the firing of the

cylinders is 180 o. No. 1 cylinder is the one nearest to

the flywheel in the left bank of cylinders, when view-

ed from the flywheel end of the engine. No. 3 cylinder

is the other cylinder in this bank. No. 2 cylinder is

the one nearest to the flywheel in the right bank of

cylinders and No. 4is the other cylinder in this bank.

The cylinders are numbered from 1 to 4 on the air

shroud near the spark plugs. The flywheel end of the

engine is designated the front and the power take-off

end, the rear of the engine.

MAGN ETa TIMING

The proper spark advance is 23

°

. To ,check timing

with a neon light, the running spark hdvance is indi-

cated by a 3/8 inch slotted hole in the rim of the air

intake screen, 68

°

left of the flywheel shroud verti-

cal centerline, marked VH, or if screen is removed,

time to the lower half of the 1/4 inch elongated hole

on the face of flywheel shroud 23° below the center-

line of No. 1 and No. 3 cylinders as illustrated in

Fig. 11. The end of the ’X’ marked vane should be

whitened with chalk or paint for this operation.

To Time hiagneto to Engine: Remove air intake

screen to expose timing ,marks on both flywheel and

shroud. See Magneto Timing Diagram, Fig. 11.

Next, remove the spark plug from No. 1 cylinder and

slowly turn the flywheel clockwise, at the same time

holding a finger over the spark plug hole, so that the

compression stroke can be determined from the air

blowing out of the hole.

The flywheel is marked with the letters ’DC’ near one

of the air circulating vanes. This vane is further

identified by an ’X’ mark ~cast on the end.See Fig. 11.

When the air blows out o,f the No. 1 spark plug hole,

continue turning the crank until the edge of the mark-

ed vane on flywheel is on line with the mark on the

~ertical centerline of the shroud as shown on Fig. 11.

Leave flywheel in this position. At this point the

~e),way for mounting the flywheel is also on top.

Reassemble spark plug.

Next, remove the inspection hole plug from the mag-

neto timing opening, located in the gear cover as

shown in Fig. 10.

Assuming that the magneto has been removed from

the engine, the following procedure should be follow-

ed before remounting.

The Number 1 cylinder firing position of the magneto

must be determined. Insert the ignition cable into the

No. 1 tower terminal of the magneto end cap and hold

the spark plug terminal at the other end, about 1/8"

away from the magneto body. Turn the magneto gear

in a clockwise rotation, tripping the impulse coupling,

until the No. 1 terminal sparks, then hold the gear in

this position. Mount the magneto to the engine, mesh-

ing the gears so that when the magneto is in place,

the gear tooth marked with an ’X’ will be visible

through the lower half of the inspection hole in the

gear cover, as shown in Timing Diagram, Fig. 11.

Tighten the nut and capscrew for mounting the mag-

neto to the gear cover, making sure the magneto

flange gasket is in place.

The No. 1 terminal is identified on the magneto cap.

The terminals follow the proper firing order of 1-3-4-2

in a clockwise direction viewing the cap end. The

leads from the magneto should be connected to spark

plugs of corresponding numbers.

No. 1 cylinder is the cylinder nearest the fan-flywheel

of the engine in the left bank and No. 3 cylinder is the

other cylinder in that bank. No. 2 cylinder is across

the engine from No. 1 and No. 4 is across from No. 3.

When the magneto is properly timed the impulse coup-

ling will snap when the ’DC’ and ’X’ marked vane of

the flywheel, line up with the mark on the flywheel

shroud which indicate the centerline of the No. 1 and

3 cylinders. This can be checked by turning crank-

shaft over slowly by means of a hand crank. The im-

pulse will also snap every 180° of flywheel rotation

thereafter.

DISTRIBUTOR - BATTERY IGNITION

On engines equipped with Flywheel Alternator or belt driven

alternator, battery ignition is used in place of magneto igni-

tion. The distributor is of the automatic advance type, and

rotor turns at one-half engine speed in a counterclockwise

direction.

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