Grade Of Oil; Service Classification Of Oil; Oil Pressure; Fuel - Wisconsin VH4D Repair Manual

GRADE OF OIL
SEASON OR TEMPERATURE
Spring, Summer or Fall
+ 120°F
to
+ 40°F
Winter
+ 40°F to + 15°F
+ 15°F
to
0°F
Below Zero
GRADE OF OIL
SAE 30
SAE 20-20W
SAE 10w
SAE 5W-20
Use Oils classified as Service SE, SF, SG or CC
Crankcase
Capacity
New engine
4 Qts.
Oil and filter change
4 Qts.
Less - filter or filter change 3~ Qts.
off the engine and check the oil level by means of
dip stick (oil gauge saber). If necessary, add enough
oil to bring level up to the full mark. The standard dip
stick location is below the oil filler-breather tube, but
can be located on starting motor side upon request.
Use only high-grade highly refined oils, corresponding
in body to the S. A. E. (Society of Automotive En-
gineers) Viscosity Numbers listed in Grade of Oil
Chart.
SERVICE CLASSIFICATION OF OIL
In addition to the S.A.E. Viscosity grades, oils are also
classified according to severity of engine service. Use oils
classified by the Americal Petroleum Institute as Serviae
SE, SFor SG. These types ofoil are for engines performing
under unfavorable or severe operating conditions such as:
high speeds, constant starting and stopping, operating in
extreme high or low temperatures and excessive idling.
Follow summer recommendations in winter if engine is
housed in warm building.
Check oil level every 8 hours of operation.
The old oil should be drained and fresh oil added
after every 50 hours of operation.
To drain oil, remove drain plug illustrated in Fig. 3.
Oil should be drained while engine is hot, as it will
then flow more freely.
OIL PRESSURE
At engine operating temperature, the oil pressure will
be about 4 to 5 pounds per square inch, and due to
this low pressure system, an oil pressure gauge is
not required. When the engine is cold the pressure
will be higher, and a relief valye is fitted to the oil
pump so that under these conditions the maximum
pressure will be limited to 15 pounds.
FUEL
These engines can be furnished with either a gravity
feed tank mounted above the carburetor fuel level, a
side mount tank, or tank mounted below the engine.
In the latter two cases, a fuel pump is furnished.
The fuel tank should be filled with a good quality
gasoline free from dirt and water. The capacity of the
tank is approximately 6 gallons. Some of the poorer
grades of gasoline contain gum which will deposit on
valve stems, piston rings, and in the various small
passages in the carburetor, causing serious trouble
in operating and in fact might prevent the engine from
operating at all.
Use only reputable, well known
brands of Unleaded gasoline.
The gasoline should have an octane rating of at least 87.
Low octane gasoline will cause the engine to detonate, or
knock, and if operation is continued under this condition,
cylinders will score, valves will burn, pistons and bearings
will be damaged, etc.
Be sure that air vent in tank cap is not plugged with dirt, as
this would prevent fuel from flowing to the carburetor.
FUEL PUMP and PRIMING (Fig. 4)
The diaghragm type fuel pump, furnished on engines
with side mount or underslung fuel tanks, is actuated
by an eccentric on the camshaft, as illustrated in
cross section of engine, Fig. 2.
Hand Primer for hand crank engine is an accessory
furnished only upon request, and is a necessary func-
tion when starting a new engine for the first time, or
when engine has been out of operation for a period of
time. Gravity feed and electric start engines do not
require hand priming.
When priming, a distinct resistance of the fuel pump
diaghragm should be felt when moving the hand lever
up and down. If this does not occur, the engine should
be turned over one revolution so that the fuel pump
drive cam will be rotated from its upper position which
prevents movement of the pump rocker arm.
Assuming the gasoline strainer is empty, approximate-
ly 25 strokes of the primer lever are required to fill
the bowl. See Fig. 4. After strainer bowl is full, an
addiUonal 5 to 10 strokes are required to fill the
carburetor bowl. When carburetor is full the hand
primer lever will move more easily.
Fig. 4