Allis-Chalmers WD Operating Instructions And Repair Parts Illustrations page 18

SPARK PLUGS - The spark plugs should be
removed every 200 hours of operation, cleaned
and the points respaced. The point gap should
be set from .030" to .040". Make this ad-
justment by bending the outside electrode.
Never bend center electrode.
CAUTION: Failure to service spark plugs
as recommended, causes a severe bverload to
be placed on magneto.
For gasoline use autolite AN7 or equivalent.
F o r l o w g r a d e f u e l u s e a u t o l i t e A - 9 o r
equivalent. Incorrect plugs are shorter lived
and cause poor engine performance.
Spark plug gap should be set properly; gap
too wide will cause missing on heavy loads
and lack of power.
Gap too narrow will cause missing, poor
idling and engine to die at slow speed.
The spark plugs and cables should be main-
tained in good condition and free of dirt and
grease.
MAGNET0 - To time the magneto - Crank engine
until No. 1 piston is approaching top center
on its compression stroke and mark F or
firing mark appears in center of inspection
opening in bottom of clutch housing.
The compression stroke of No. 1 piston can
be determined by removing the spark plug
placing thumb in spark plug hole. Crank
slowly until air is forced past thumb.
mark F on flywheel will be very near the
inspection opening at this time. Turn until
centered.
Remove the distributor
from the magneto that is retained by two
screws.
Turn magneto impulse coupling
counter-clockwise until the rotor contact lines
up with the timing lug, located in upper left
hand corner of distributor compartment.
Couple magneto to engine. If rotor does not
exactly line up with lug, turn magneto on
engine until it does.
mounting bracket are provided for this pur-
pose.
Attach number one spark plug wire to upper
terminal nearest cylender
to upper terminal farthest from block, number
four to lower terminal farthest from block,
and number three in remaining terminal. In
event of difficulty in the ignition system, plugs,
wires having been checked, remove the dis-
tributor compartment cover held in place by
IGNITION SYSTEM
T h e
compartment cover
The slotted holes in
block. number two
- SPARK PLUG ADJUSTMENT
NO. 1
DISTR A
IBUTOR C P
FMX MAGNETO
four screws. If contact points are pitted or
pyramided, file smooth with a fine cut file.
If points are worn or badly pitted they should
be replaced. Points should have .010" sepa-
ration when breaker points rest on high side of
1 8
CO
NDENSER
PINION
ADJUSTING SCREW
OTOR VENTILATING HOLES