TM 9-3431-254-14&P
in hard starting, which can be overcome by choking
choke if it tends to stop. Even a hot engine re-
the engine when cranking or waiting until the engine
quires a momentary choking when starting. when
has cooled off sufficiently to overcome the vapor lock.
engine starts release switch to `run' position.
ANTI-DIESEL VALVE
If flooding should occur, continue cranking with the
starting motor, but with choke open (choke button in).
High compression engines have a tendency to occa-
sionally diesel, after the ignition has been shut off.
After engine starts; allow it to warm up a few minutes
To rectify this condition, an unti-dieseling solenoid
before applying load, as prescribed in 'Warm-Up
valve is provided to assure immediate stopping.
Period' paragraphs.
When the ignition is turned off, the solenoid becomes
New engines; started for the first time, should be
de-energized and releases a valve that shuts off the
"run-in" gradually to insure trouble-free service and
fuel supply in the carburetor, thus stopping the en-
long engine life. Refer to "Starting and operation of
gine. CAUTION: Engine will not operate if ignition
New Engine" instructions, on page B-3, for correct
wire from anti-diesel solenoid to starting switch is
running-in procedures.
disconnected.
WARM-UP PERIOD
If solenoid is removed from carburetor for same rea-
son, use a new fibre washer in reassembly, and
The engine should be allowed to warmup to operating
tighten to 100 inch pounds torque.
temperature before load is applied. This requires only
OIL FILTER
a few minutes of running at moderate speed. Racing
an engine or gunning it, to hurry the warm-up period,
A full-flow oil filter is furnished on this model of en-
is very destructive to the polished wearing surfaces
gine as standard equipment. Since all of the circulat-
ed oil passes thru the filter, it is very important that
proper oil film on these various surfaces cannot be
it be serviced regularly in order to function properly.
established until the oil has warmed up and become
When the filter element becomes clogged, the oil by-
sufficiently fluid. This is especially important on new
passes the filter material by means of a relief valve
engines and in cool weather.
located in the top of the oil filter. See Fig. B-7. As a
result, there is no variation in oil pressure to indi-
Racing an engine by disconnecting the governor, or by
cate that the oil filter is clogged anti requires re-
doing anything to interfere with the governed control
placement. The oil filter should be replaced after
engine speed, is extremely dangerous. Tine governor
every other oil change. If operating conditions are
is provided as a means for controlling the engine
extremely dusty, replace filter after every oil change.
speed to suit the load applied, and also as a safety
measure to guard against excessive speeds, which
The oil filter is easily removed by unscrewing it from
not only overstrain all working parts, but which might
its mounting pad on the side of the crankcase. Refer
cause wrecking of the engine and possible injury to
to "Oil Filter" in disassembly instructions. Wnen re-
bystanders.
assembling a new filter, add a film of oil to the face
of the rubber gasket at the base - turn filter to a
All parts of the engine are designed to safely with-
snug fit, then turn more. Do not over-tighten.
stand any speeds which might normally be required,
but it must be remembered that the stresses setup in
Pour 1 additional quart of oil into crankcase when
rotating parts increase with the square of the speed.
replacing oil filter. Use only a Wisconsin oil filter,
That means that if the speed is doubled, the stresses
specially designed for this model of engine. Refer to
will be quadrupled, and if the speeds are trebled, the
parts list for correct service part number.
stresses will be nine times as great.
BREATHER CAP
Strict adherence to the preceding instructions cannot
The crankcase is ventilated thru a breather cap
be too strongly urged, and greatly increased engine
mounted to the top of the oil filler tube, as illustrated
life will result as a reward for these easily applied
in Fig. B-7. At every oil change, it is recommended
recommendations.
that the cap be cleaned by washing in kerosene.
STOPPING ENGINE
TO stop engine; turn ignition-starting switch to 'off'
OIL PRESSURE AND ADJUSTMENT
position.
HIGH PRESSURE SYSTEM
If the engine has been running hard and is hot, do not
stop it abruptly from full load, but remove the load
Oil supplied to the center main and connecting rod
and allow engine to run idle at 1000 to 1200 R.P.M.
bearings, at 40 to 45 P.S.I. gauge pressure (was 50)
for three to five minutes, depending on how hot the
P.S.I.), is controlled by a pressure relief valve, pro-
engine has been. This will reduce the internal tem-
perly adjusted at the factory. Readjustment, when
perature of the engine much faster, minimize valve
necessary, must be made while engine is running.
warping, and of course the external temperature, in-
Refer to Fig. B-7 and the following instructions:
cluding the manifold and carburetor will also reduce
The oil pressure relief valve is located beneath the
faster, due to air circulation from the flywheel.
starting motor and next to the oil filter. The stub end
One of the main troubles caused by the abrupt shut-
of the valve is closed off by an expansion plug. Re-
ting off of a hot engine is vapor lock. This will result
move plug from the end of the valve, then, with a
