Starting; Starting Procedure; Stopping Engine; Warm-Up Period - Wisconsin vg4d Repair Manual

On power unit engines, a push button ignition switch
is mounted on the outside of the house panel at the
flywheel end. See bottom view of Fig. I. V.hen starting
engine, the ignition switch button is pulled out. To
stop, push in. This will apply to both magneto and
battery ignition systems.
STARTING
Caution: Maintain a safe distance
from moving
parts of equipment. Know how to stop the engine
quickly in case of emergency.
Caution: Do not operate engine in a closed build-
ing unless it is properly ventilated.
STARTING PROCEDURE
1. Check crankcase oil level and gasoline supply. Open
fuel shut-off valve in fuel strainer or tank.
2. Disengage clutch, if furnished.
3. Pull variable speed control 'T' handle out about half-
way and lock in place. With a two speed control, start
in full load position--idle after engine starts.
4. Close choke by pulling choke button to extreme out
position.
5. Pull out ignition switch button, tag reads 'To Stop
Push In '.
6. Depress starter switch to start engine.
IMPORTANT:
Do not crank engine for more than 30 seconds
at a time if engine fails to start, wait about 2
minutes between cranking periods to prevent
starter from over-heating.
7. After engine starts, push choke button in gradually as
required for smooth running. Choke must be com-
pletely open (button in) when engine is warmed up.
If flooding should occur, open choke fully by pushing
choke button in and continue cranking. Less choking is
necessary in warm weather or when engine is warm, than
when cold.
WARM-UP PERIOD
The engine should be allowed to warm up to operating
temperature before load is applied. This :requires only
a few minutes of running at moderate speed. Racing
an engine or gunning it,
to hurry the wa~m-up period,
is very destructive to the polished wearing surfaces
on pistons, rings, cylinders, bearings, etc., as the
proper oil film on these various surfaces cannot be
established until the oil has warmed up and become
sufficiently fluid. This is especially important on new
engines and in cool weather.
Racing an engine by disconnecting the governor, or by
doinganything to interfere with the govemorcontrolled
engine speed,
is extremely dangerous. The governor
is provided as a means for controlling the engine
speed to suit the load applied, and also as a safety
measure to guard against excessive speeds, which
not only overstrain all working parts, but which might
cause wrecking of the engine and possible injury to
bystanders.
All parts of the engine are designed to safely with-
stand any speeds which might normally be required,
but it must be remembered that the stresses set up in
rotating l~arts, increase with the square of the speed.
That means that if the speed is doubled the stresses
will be quadrupled; and if the speeds are trebled, the
stresses will be nine times as great.
Strict adherence to the above instructions cannot be
too strongly urged, and greatly increased engine life
will r~sult as a reward for these
easily applied
recommendations.
STOPPING ENGINE
Magneto ignition engines, less house, have a lever
type stop switch on the side of the magneto. On these,
to stop engine, depress lever and hold down until en-
gine stops.
Power units and battery ignition engines, are furnished
with an ignition switch, ~To Stot~ P,sh 1~"
If the engine has been running hard and is hot, do not
stop it abruptly from full load, but remove the load
and allow engine to run idle at 1000 to 1200 R.P.M.
for three to five minutes. This will reduce the internal
temperature of the engine much faster, minimize valve
warping, and of course the external temperature, in-
cluding the manifold and carburetor will also reduce
faster, due to air circulation from the flywheel.
Two main troubles resulting from abruptly shutting off
a hot engine are vapor lock and dieseling. Vapor lock
will prevent the flow of fuel in the fuel lines and
carburetor passages, which will result in hard starting.
This can be overcome by choking the engine when
cranking,or waiting until the engine has cooled off.
Dieseling, is caused by the carbon and lead deposits
in the cylinder head being heated up to such an ex-
tent that they continue to fire the engine and keep it
running after the ignition has been shut off. By idling
the engine for a few minutes the carbon and lead de-
posits cool off, break up, and will blow out thru the
exhaust. If engine has a tendency to diesel, by sud-
denly setting the throttle wide open and at the same
time shutting off the ignition, the engine will stop.
MAINTENANCE
OIL FILTER
A by-pass type oil filter is furnished on these en-
gines, as shown in Fig. 3. except in a few cases
where the use of other accessories prevents the
mounting of an oil filter. The oil filtering cartridge
should be replaced after every other oil change. If
operating conditions are extremely dusty, replace
cartridge after every oil change.
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