TM 9-3431-254-14&P
High grade oil of the body suited to the requirements
of your engine is the most important single item in
the economical operation of the unit, yet it is the
cheapest item of operating cost. Select your oil solely
on quanlity and suitability - never on price - for
no one thing is so sure to bring abut unsatisfactory
performance and unnecessary expense as incorrect
lubrication. High-grade highly refined oils, arres-
ponding in body to the S. A. E. Viscosity Numbers
listed in Grade Of Oil Chart will prove economical
and assure long engine life.
83622C
SERVICE CLASSIFICATION OF OIL
In addition to the S. A. E. Viscosity grades, oils are
Be sure that air vent in tank cap is not plugged - this
also classified according to severity cf engine ser-
would impede the flow of fuel to the carburetor.
vice, Use oils classified by the American Petroleum
Institute as Service MS, SD or SE. These types of oil
FUEL PUMP and PRIMING (Fig. B-6)
are for engines performing under unfavorable or severe
The diaghragm type fuel pump is actuated by an ec-
operating conditions such as: high speeds, constant
centric on the camshaft, as illustrated in cross sec-
starting and stopping, operating in extreme high or
tional view of engine, page B-7.
low temperatures and excessive idling.
Hand Primer for hand crank engine is furnished as an
GRADE OF OIL
option, and is a necessary function when starting a
SEASON OR TEMPERATURE
GRADE OF OIL
new engine for the first time, or when enigine has been
out of operation for a period of time. Gravity feed and
electric start engines do not require hand priming.
MIL-L-46152
Winter
diaghragm should be felt when moving the hand lever
+ 40F to + 15F
SAE 20-20W
up and down. If this does not occur, the engine should
+ 15F to 0F
SAE 10W
be turned over one revolution so that the fuel pump
SAE 5W-20
Below Zero
drive cans will be rotated from its upper position
which prevents movement of the pump rocker arm.
Assuming the gasoline strainer is empty, approximate-
iy 25 strokes of the primer lever are required to fill
the bowl. See Fig. B-6. After strainer bowl is full, an
addtional 5 to 10 strokes are required to fill the
For run-in of new engines, use same oil as recom
carburetor bowl. When carburetor is full the hand
mended in Grade of Oil Chart.
primer lever will move more easily.
Follow summer recommendations in winter if engine
STARTING
is housed in warm building.
ELECTRIC STARTING MOTOR
Check oil level, every 8 hoursof operation.
A 12 volt starting motor with an attached starting
The old oil should be drained and fresh oil added
solenoid is provided as standard equipment on this
after every 50 hours of operation.
model engine, unless otherwise specified.
To drain oil, remove drain plug in oil pan at oil filter
Do not oil Bendix drive. Keep screw threads clean
side. Oil should be drained while engine is hot, as it
and if necessary, lubricate with powdered graphite.
will then flow more freely.
STARTING PROCEDURE
FUEL
1. Check crankcase oil level and fuel supply. Open
The fuel tank should be filled with a good quality
fuel valve.
gasoline, free from dirt and water. Some of the poorer
grades of gasoline contain gum which will deposit on
2. Disengage clutch, if furnished.
valve stems, piston rings, and in tie VariOUS small
3. New engines require priming refer to "Fuel Pump"
passages in the carburetor, causing serious trouble
paragraph for instructions.
in operating and in fact might prevent the engine
from operating at all.
4. Set throttle about l/2 open if variab!e speed gov-
ernor control is furnished, with a two-speed con-
Use only reputable, well known brands o f
trol, start in full load position.
REGULAR GRADE gasoline.
5. Turn ignition-starting
switch to `start' position
The gasoline should have an octane rating of at least
and at the same time
pull out choke button only
90. Low octane gasoline will cause the engine to de-
sufficient to start the
engine. Release choke but-
tonate, or knock, and if operation is continued under
ton to open position
after engine starts, but re-
this condition, cylinders will score, valves will burn,
