Wisconsin Air Cooled TRA-10D User manual

WISCONSIN
HEAVY DUTY ENGINES
INSTRUCTION BOOK AND PARTS LIST
MODELS TRA-10D, TR-10D
ISSUE MM-320-C
WORLD’S LARGEST BUILDERS OF HEAVY DUTY AIR COOLED ENGINES

I M P O R T A N T
STARTING AND OPERATING OF NEW ENGINES
Careful breaking in of a new engine will greatly increase its life and result
in trouble-free operation. A factory test is not sufficient to establish the
polished bearing surfaces, which are so necessary to the proper perform-
ance and long life of an engine. Neither is there a quick way to force the
establishment of good bearing surfaces. These can only be obtained by
running a new engine carefully and under reduced speeds and loads for a
short time, as follows:
First, be sure the engine is filled to the proper level with a good quality
of
engine oil , see “Grade of Oil” chart.
Before a new engine is put to its regular work, the engine should be oper-
ated at low idle speed (1000 to 1200 R.P.M.) for one half hour, without
load. The R.P.M. should then be increased to engine operating speed,
still
without load, for an additional two hours.
If at all possible, operate the engine at light loads for a period totaling
about eight hours, before maximum load is applied. This will greatly in-
crease engine life.
The various bearing surfaces in a new engine have not been glazed, as
they will be with continued operation, and it is in this period of “running
in,” that special care must be exercised, otherwise the highly desired glaze
will never be obtained. A new bearing surface that has once been
damaged by carelessness will be ruined forever.
THEREFORE READ INSTRUCTIONS CAREFULLY
A copy of this manual is sent out with each engine. All points of opera-
tion and maintenance have been covered as carefully as possible but if
further information is required, inquiries sent to the factory will receive
prompt attention.
When writing the factory ALWAYS GIVE THE MODEL AND SERIAL
NUMBER of engine referred to.
Extra copies of this manual are $1.00 each.
WISCONSIN MOTOR CORPORATION
MILWAUKEE, WISCONSIN 532466

1 MI-935-2
BOOK OF INSTRUCTIONS
WISCONSIN
SINGLE CYLNDER ENGINES
MODEL TRA-10D
3-1/8” Bore – 2-7/8” Stroke
22.05 cu. In. Displacement
MODEL TR-10D
3-1/8” Bore – 2-5/8” Stroke
20.2 cu. In. Displacement
WISCONSIN MOTOR CORPORATION
Milwaukee, Wisconsin 53246, U. S. A.

MI-476 2
INTRODUCTION
This manual has been compiled to suit the service requirements of the basic
engines and accessories most commonly supplied with engines.
Wisconsin Motor Corporation adapts its engines to suit individual customer re-
quirements whenever practical. However, it would become too involved to include
all variations in one manual; therefore, should any problems arise concerning
engine servicing, we advise that a Wisconsin distributor or authorized service
station be contacted, as they are capable of identifying all parts by the specifi-
cation numbers stamped on the name plate of engine.
A listing of approved Wisconsin service stations appears in the back of this
manual.
WISCONSIN heavy duty air cooled engines are of the most advanced design and
are built in a modern factory, equipped with the latest machinery available. Only
the best materials, most suitable for the particular part, are used. During produc-
tion, every part is subjected to the most rigid inspection, as are also the com-
pletely assembled engines. After assembly, every engine is operated on its own
power for several hours. All adjustments are carefully made so that each engine
will be in perfect operating condition when it leaves the factory.
Back of the Wisconsin Motor Corporation are more than fifty years of engineering
experience in the design of gasoline engines for every conceivable type of ser-
vice. The performance of these engines is proof of the long satisfactory service
you too can expect from your engine.
Like all fine machinery, the engine must be given regular care and be operated in
accordance with the instructions.
SAFETY PRECAUTIONS
Precaution is the best insurance against an accident.
Never fill fuel tank while engine is in operation or hot, to avoid the possibility
of spilled fuel causing a fire.
Never operate engine in a closed building unless the exhaust is piped outside.
This exhaust contains carbon monoxide, a poisonous, odourless and invisible gas,
which if breathed causes serious illness and possible death.
Never make adjustments on machinery while it is connected to the engine, with-
out first removing the ignition cable from the spark plug. Turning over the ma-
chinery by hand during adjusting or cleaning might start the engine and machin-
ery with it, causing serious injury to the operator.
Keep this book handy at all times, familiarize
yourself with the operating instructions.

INDEX
3 MI-936-2
PAGE
Air Cleaner ..................................................... 10
Battery Ignition .............................................. 11
Breaker Point Adjustment .............................. 11
Breather – Crankcase ..................................... 10
Carburetor – Adjustment ............................... 9
Carburetor Repair – See Manufacturer’s Bulletin
in Back of Manual.
Compression ........................................................ 15
Compression Release ........................................... 7 – 22
Compression – Restoring ..................................... 14
Cooling ................................................................. 7
Cross Section of Engine ........................................ 6
Disassembly and Reassembly ...............................
16
Breaker Push pin and Bushing ...........................
22
Camshaft and Valve Tappets .............................
22
Carburetor and Air Cleaner ...............................
17
Connecting Rod and Piston ...............................
20
Crankshaft .........................................................
23
Cylinder ..............................................................
23
Cylinder Head and Spark Plug ............................
17
Flywheel ............................................................
19
Flywheel Shroud ................................................
17
Fuel Tank ...........................................................
17
Gear Cover .........................................................
20
Piston, Ring and Rod Clearance Chart ...............
21
Piston Rings .......................................................
21
Starter Sheave ...................................................
17
Stator Plate ........................................................
23
Valves and Seat Insert .......................................
18
Valve Guides ......................................................
18
End Play ................................................................ 23
Engine Illustration ................................................ 4 – 5
Engine Speed ........................................................ 24
Electrical Equipment Wiring Circuits and
Motor-Generator ...............................................
13
Fuel ....................................................................... 8
Fuel Pump ............................................................ 8
General Design ..................................................... 7
Governor Adjustment .......................................... 24
PAGE
Governor - Description ......................................... 7
Governor - Operation .......................................... 23
Horsepower .......................................................... 7
Ignition (Description) ........................................... 7
Ignition Spark ....................................................... 10
Lubrication ........................................................... 7
Lubrication System ............................................... 7
Magneto Ignition .................................................. 11
Magneto Service Instructions .............................. 12
Oil – Grade of and Classification .......................... 8
Parts List Section .................................................. 25
Rotation ................................................................ 7
Safety Precautions ................................................ 2
Service Station Directory – See Back Of Manual.
Spark Plug ............................................................ 14
Starting and Operating Instructions .................... 7
Starting – Procedure ............................................ 8
Starting and Operation of New Engine (See
Inside of Front Cover ).
Stopping Engine ................................................... 9
Storage of Engine For Winter ............................... 14
Testing Rebuilt Engine .......................................... 16
Timing ................................................................... 11
Timing Marks ....................................................... 22
Troubles - Causes and Remedies ..........................
15
Backfires Through Carburetor ...........................
16
Ignition ...............................................................
15
Knocks ................................................................
16
Misses ................................................................
16
Overheats ..........................................................
16
Starting Difficulties ...........................................
15
Stops ..................................................................
16
Surges or Gallops ...............................................
16
Valves – Grinding and Tolerance Chart ................ 18
Tappet Adjustment .............................................. 19
Warm-Up Period – Overspeeding ........................ 9

MI-937-2 4
Fig. 1 289860C
TAKE-OFF (rear) and LEFT HAND SIDE VIEW of ENGINE

5 MI-938-2
FAN END (front) and RIGHT HAND SIDE VIEW of ENGINE

MI-939-2 6
SECTIONAL VIEWS OF ENGINE

7 MI-1058
GENERAL DESIGN
Wisconsin engines are of the four cycle type, in which
each of the four operations of suction, compression,
expansion and exhaust constitutes a complete stroke.
This gives one power stroke for each two revolutions of
the crankshaft.
COMPRESSION RELEASE
A component part of the camshaft that operates auto-
matically and trouble free. Permits fast and effortless
starting with no dangerous “kick back”.
COOLING
Cooling is accomplished from a flow of air circulated
over the cylinder and head of the engine, by a combi-
nation fan-flywheel encased in a sheet metal shroud.
The air is divided and directed by ducts and baffle
plates to insure uniform cooling of all parts.
Never operate an engine with any part of the
shrouding removed, because this will retard the
air cooling.
Keep the cylinder and head fins free from dirt
and
chaff. Improper circulation of cooling air will
cause engine to overheat.
CARBURETOR
The proper combustible mixture of gasoline and air is
furnished by a balanced carburetor, giving correct fuel
to air ratios for all speeds and loads.
IGNITION
The spark for ignition of the fuel mixture is furnish -
ed by a high tension flywheel magneto. A stator plate
functions as an engine bearing plate as well as a sup-
port for the coil and core. The permanent magnet is an
integral part of the flywheel, and a breaker box on the
side of the crankcase contains the points, condenser
and stop switch. A push pin, actuated by the engine
camshaft, operates the breaker arm at half engine speed.
Battery ignition (12 volt) can be furnished in place of
magneto, when specified. An ignition coil and breaker
assembly are the means of inducing high voltage to
the
spark plug . Battery is not furnished by Wisconsin
Motor Corporation.
LUBRICATION SYSTEM
An oil dipper on the connecting rod provides for a
splash type lubrication system. The action of the dip-
per striking the oil in the crankcase provides ample lub-
rication for all internal parts of the engine.
GOVERNOR
A governor of the centrifugal flyball type controls the
engine speed by varying the throttle opening to suit
the
load imposed upon the engine. Manually operated
variable speed controls are available for practically
all
applications.
ROTATION
The rotation of the crankshaft is clockwise when
viewing the flywheel or starting end of the engine.
This gives counter-clockwise rotation at the power
take- off end of the crankshaft.
Horsepower given in the accompanying chart is for an
atmospheric temperature of 60° Fahrenheit at sea
level and at a Barometric pressure of 29.92 inches of
mercury.
HORSEPOWER
For each inch lower the Barometric pressure drops,
there will be a loss in horsepower of 3½%.
For each 10° temperature rise there will be a reduce-
tion
in horsepower of 1%.
For each 1000 ft. altitude above sea level there will
be a
reduction in horsepower of 3½%.
The friction in new engines cannot be reduced to the
ultimate minimum during the regular block test, but
engines are guaranteed to develop at least 85 per
cent of maximum power when shipped from the fac-
tory. The power will increase as friction is reduced
during the first few days of operation. The engine will
develop at least 95% of maximum horsepower when
friction is reduced to a minimum.
INSTRUCTIONS FOR
STARTING AND OPERATING
LUBRICATION
Before starting a new engine, fill crankcase base with
the correct grade of engine oil, as specified in “grade
of
oil chart”. Fill thru the dipstick plug opening illus-
trated in Fig. 4, with 1 quart of oil.
For run-in of new engines, use same oil as recom-
mended in Grade Of Oil Chart.
The oil level mark is indicated by a groove on the dip
stick as shown in Fig 4. Check oil level by resting
the
bottom of plug at the top of oil filler opening on
gear cover. (Do not thread in place to check level).
Too much emphasis cannot be given to the matter of
oil
selection. High grade oil of the body suited to the
requirements of your engine is the most important sin-
gle item in the economical operation of the unit, yet
R.P.M MODEL TRA-10D
2000
5.4
2200
6.1
2400
6.8
2600
7.6
2800
8.3
3000
8.8
3200
9.4
3400
9.8
3600
10.1

MI-1059 8
SEASON OR
TEMPERATURE
GRADE
OF OIL
EXAMPLE
Spring, Summer
Or Autumn
+120°F to +40°F
SAE 30 Mobiloil A
Winter
+40°F to +15°F
+15°F to 0°F
Below Zero
SAE 20-20W
SAE 10-10W
SAE 5W – 20W
Mobiloil Arctic
Mobiloil 10W
Mobiloil 5W-20W
Use oils classified as Service MS
Crankcase Capacity 1 Quart
it is the cheapest item of operating cost. Select your
oil solely on quality and suitability – never on price –
for no one thing is so sure to bring about unsatifac-
tory performance and unnecessary expense as incor-
rect
lubrication.
High-grade, highly refined oils corresponding in body
to the S.A.E. (Society of Automotive Engineers)
Viscosity
Numbers listed in the following chart will
prove economical and assure long engine life.
GRADE OF OIL
Important: S.A.E. Viscosity Numbers classify oils in
terms of body only, without consideration of quality
or character; therefore we list certain grades of Mobil
oil as typical examples of lubricants possessing the
qualities we believe desirable in oils for Wisconsin
engines. We plainly state that these grades of Mobil-
oils are listed because of their recognized quality
and
world-wide distribution. There are other high
quality oils on the market that are equally satisfac-
tory for Wisconsin engines.
Follow summer recommendations in winter if engine is
housed in warm building.
Check oil level every 8 hours. Change oil every
50 hours of operation.
To drain oil, remove drain plug illustrated in Fig. 1.
Oil should be drained while engine is hot, as it will
then flow more freely.
SERVICE CLASSIFICATION OF OIL
In addition to the S.A.E. Viscosity grades, oils are
also
classified according to the severity of engine ser-
vice. Use oil classified as Service MS . This type of oil
is for engines performing under unfavourable or
severe
operating conditions such as: high speeds,
constant starting and stopping, operating in extreme
high or low temperatures and excessive idling.
FUEL
The fuel tank should be filled with a good quality
gasoline free from dirt and water. The capacity of the
tank is one gallon. Some of the poorer grades of gaso-
line contain gum which will deposit on valve stems,
piston rings, and in the various small passages of the
carburetor, causing trouble in operating, and in fact
might prevent the engine from operating at all.
Use only reputable, well known brands of gas-
oline of the REGULAR GRADE.
The gasoline should have an octane rating of at least
90. Fuel with a low octane rating will cause detona-
tion, and if operation is continued under this condi-
tion, severe damage will result to the engine. The
cylinder and piston will be scored, head gasket blown
out, bearings will be damaged, etc.
Be sure that air vent in fuel tank cap is not plugged
with dirt, as this would prevent fuel from flowing to
the carburetor.
FUEL PUMP
An engine equipped with fuel pump; when starting for
the first time, or when engine has been out of opera-
tion for a while, should be primed to prevent hard
starting. Disconnect ignition wire at the spark plug
to
prevent engine from accidentally starting. Then,
turn the engine over about 6 or 7 times, by means of
the rope starter sheave, to actuate the fuel pump and
thus fill the carburetor bowl with gasoline. Be sure
and connect ignition wire after priming has been ac-
complished.
Fuel pump is an optional accessory. Due to special
machining of crankcase, fuel pump can be furnished
only upon request when engine is ordered. Instruc-
tions for fuel pump maintenance and repair are located
in the back of this manual.
STARTING
STARTING PROCEDURE (Fig. 5 and Fig. 6)
1.
Check crankcase oil level and gasoline supply.
Open fuel shut-off valve.
2. The main jet adjustment on the carburetor is made
when engine is tested at the factory. Refer to
‘Carburetor – Adjustment’ for further information.
3. Disengage clutch if furnished.
4.
Set throttle about 1/2 open if variable speed gov-
enor control is furnished. With a fixed speed gov-
ernor, spring will hold throttle open for starting.