As a general rule it will not pay an owner, not equipped with specialized test equipment, to undertake generator repairs. There are some adjustments which may be made without this equipment and which are covered below.
Should the generator stop charging, examine all connections in the charging line to be sure they are clean and tight. Also note the condition of the commutator and brushes. If the commutator is dirty and discoloured, it can be cleaned by holding a piece of No. 00 sand-paper against it with the engine running at idle speed. Do not use emery or carborundum cloth.
The brushes must slide freely in their holders and should they be badly worn or oil soaked, they should be replaced. Excessive arcing between the cummutator and brushes usually indicates incorrect seating of the brushes against the commutator or high mica insulation between the commutator segments. Incorrect seating may be corrected by drawing a piece of No. 00 sand-paper around the commutator with the sanded side against the brush. After sanding, blow the carbon dust and sand from the generator.
Should the above attention fail to make the unit operate satisfactorily, consult your Willys-Overland Dealer.
VOLTAGE REGULATOR
The regulator must be adjusted with great accuracy; hear as well as
voltage and amperage must be considered when adjusting it. Should
trouble develop in the regulator either consult a Willys-Overland Dealer
or install a new one.
DISTRIBUTOR ASSEMBLY
The distributor delivers the spark to the right cylinder at the right
time. The mechanical breaker, built into the distributor, opens and
closes the primary circuit at the exact time for ignition. See Fig.
7 on the first page of Proper Maintenance.
The distributor cap should be kept clean for efficient operation. It should be inspected periodically for cracks, carbon runners, evidence of arcing and badly corroded high tension terminals. If any of these conditions exist, the cap should be replaced.
Inspect the distributor rotor for cracks or evidence of excessive burning at the end of the metal strip. After a rotor has had normal use, the end of the metal strip will become burned. If burning is found on top of the rotor, it indicates the rotor is too short and should be replaced. Usually then this condition is found, the distributor cap segment will be burned on the horizontal face and the cap should also be replaced.
The distributor contact points should be kept clean and not burned or pitted. The contact gap should be set at .020" (0.51 mm.). When making adjustments, be sure that the fibre block in the breaker arm rests on one of the high points of the cam. Adjust the points by loosening the lock screw and turning the eccentric head screw. Recheck the gap after tightening the lock screw.
Should new contact points be installed they should be aligned so as to make contact at the centre of the contact surfaces. Bend the stationary contact bracket to secure correct alignment and then recheck the gap.
SPARK PLUGS
Keep spark plug porcelains clean. Dirty porcelains will cause
hard engine starting and poor operation especially in damp weather.
The spark plug electrode gap should be set at .030" (0.76 mm.). Too wide gap will cause misfiring, especially at high speeds and when operating with open throttle, while a small gap causes poor idling. Uniform gap setting assures smooth engine operation.
It is recommended that spark plugs be replaced at intervals of each 10,000 miles of service for, because of erosion, the spark loses intensity.
STARTING MOTOR
The starting motor requires little attention except regular lubrication.
It is a standard three-bushing type motor with right-hand type Bendix spring.
It is not advisable to lubricate the Bendix drive shaft. In use dirt and dust will cling to the Bendix shaft, if lubricated. In time the shaft may become gummy, preventing engagement of the Bendix pinion with the fly-wheel ring gear, especially in cold weather. Should the starting motor turn without turning the engine, remove the motor and wash the Bendix assembly thoroughly with cleaning solution.
FUEL SYSTEM
The fuel system consists of the fuel tank lines, fuel pump, carburetor
and air cleaner. The most important maintenance attention is to keep
the system clean and free of water, also periodically inspect for leaks.
Should the vehicle be stored for an extended period, the fuel system should
be completely drained and the engine started and allowed to run until the
carburetor is emptied. This will avoid oxidation of the fuel, resulting
in the formation of gum in the units of the system.
Gum formation is similar to hard varnish and may cause trouble in the fuel pump valves or the carburetor float valve may become stuck or the filter screen blocked. Gum formation can be dissolved by acetone, obtainable in most drug stores. In extreme cases, it will be necessary to disassemble and clean the fuel system, however, often one pint of acetone placed in the fuel tank with about one gallon of gasoline will dissolve any deposits as it passes through the system with the gasoline.
CARBURETOR
The Carter carburetor, Model W.O.-596S is a precision instrument designed
to deliver the proper fuel and air mixtures at all engine speeds.
Carburetor parts wear little; the chief cause of faulty carburetor is blamed
for poor engine performance when the trouble is elsewhere (see EMERGENCY
CHART). Do not disturb the carburetor until it is proven that
the trouble is not elsewhere. Should it be determined that the carburetor
is at fault consult your Willys-Overland Dealer.
The carburetor is provided with an external adjustment to secure smooth engine idle. Fig. 14, No. 15. To set this adjustment, proceed asa follows:
Make sure that the choke is in a fully open position Close the
idle adjustment by turning it to the right or in against the seat; then
open it one and one-quarter turns. Start the engine and run it until
operating temperature is obtained, then turn the adjustment in or out slightly
until the engine fires evenly. Open the throttle for a few seconds
allowing the engine to clean the manifold. Recheck the adjustment,
then set the throttle stop screw at an idle speed of 600 tpm. or approximately
6 miles per hour in high gear.
 |
1. Pump Operating Lever
Assembly
2. Choke Valve Assembly 3. Choke Shaft and Lever Assembly 4. Metering Rod Spring 5. Nozzle 6. Nozzle, Retaining Plug 7. Metering Rod Disc 8. Neddle, Pin, Spring and Seat Assembly 9. Float and Lever Assembly 10. Low Speed Jet Assembly 11. Idle Well Jet 12. Metering Rod Jet and Gasket Assembly 13. Metering Rod 14. Nozzle Passage Plug and Gasket Assembly |
15. Idle Adjustment Screw
16. Idle Adjustment Screw Spring 17. Idle Port Rivet Spring 18. Throttle Valve 19. Pump Jet 20. Pump Jet Strainer Nut 21. Pump Jet Strainer 22. Intake Ball Check Assembly 23. Discharge Disc Check Assembly 24. Pump Plunger Spring 25. Pump Plunger and Rod Assembly 26. Pump Arm Spring 27. Pump Connecting Link 28. Pump Arm and Collar Assembly |
FUEL DIFFUSER
The engine is equipped with a fuel diffuser built as part of a thick
insulting gasket which is installed between the carburetor and the intake
manifold. In operation the diffuser causes intense swirling of the
fuel and air in the manifold. Under some operating conditions this
results in a drier and more satisfactory fuel mixture.
FUEL PUMP
The fuel pump is of the diaphragm type attached to the left side of
the crankcase and operated from an eccentric on the camshaft, Fig. 13.
The pump draws gasoline from the fuel tank, through a filtering screen
mounted in the pump sediment chamber and forces it to the carburetor.
The pump pressure is 4 ½ lbs. at 16” above the outlet at 1800 rpm.
Engine speed.
The sediment chamber can be removed by backing off the thumbscrew nut sufficiently to permit swinging the wire clamp to one side. The bowl or cover should be washed and wiped dry and the screen dried and then cleaned with a stiff brush. When reassembling the bowl, make certain that the cork gasket is not broken; reverse it and position it flat on the seat then install the bowl and tighten the thumb nut securely. After cleaning, start the engine and carefully inspect the bowl to guard against leakage.
Lack of gasoline in the carburetor may be caused by the following conditions:
Should the carburetor flood (too much gasoline), check the unit
to make certain that the needle valve Fig. 14, No. 8, is seating properly
and that the float No. 9 is not stuck.
CAUTION: Do not attempt repairs which require disassembling of the fuel pump other than cleaning as special care is required. It is recommended that all fuel pump trouble be taken up with your Willys-Overland Dealer.
FUEL SUPPLY TANK
The capacity of the fuel tank is 10 ½ gal. (U.S.). When
filling the tank, care should be used that no foreign matter or water enters
the tank. Once each season, at a time when the fuel supply is low
in the tank, remove the drain plug in the bottom to drain out sediment
and water which may have accumulated.
COOLING SYSTEM
The practice of checking the condition of the cooling system of you
Jeep while lubricating it will guard against costly delays in service.
Inspecting the condition of the radiator and heater hoses; also the fan
belt and water pump will eliminate the possibility of an overheated engine
due to a water leak or loose fan belt.
RADIATOR ASSEMBLY
The radiator is designed to cool the water under all operating conditions
however, the core must be kept free from corrosion and scale and the air
passages free of chaff, dust and mud.
At least twice a year flush out the cooling system. A good way to do this is to remove the drain cock at the bottom of the radiator and that in the cylinder block under the generator. Place a hose in the radiator filler opening and adjust the flow of water to equal that draining from the two openings. Start the engine and allow it to run until the cooling system is thoroughly flushed. After flushing it is advisable to install a corrosion inhibitor in the system to prevent rust and scale. This may be obtained from your Willys-Overland Dealer.
Should the air passages become clogged, do not use a metal tool of any kind to clean them. Use compressed air or water pressure and clean from the rear, forcing the dirt out through the front of the radiator.
RADIATOR FILLER CAP
The cap is of the pressure type, which prevents evaporation and loss
of cooling solution. A pressure up to 4 ½ pounds makes the
engine more efficient by permitting a slightly higher operating temperature.
Vacuum in the radiator is relieved by a valve in the cap which opens at
½ to 1 pound vacuum.
DRAINING COOLING SYSTEM
To completely drain the cooling system, open both drain cocks; that
at the bottom of the radiator and also in the cylinder block under the
generator. Remove the radiator cap to break any vacuum which
might prevent thorough draining.
THERMOSTAT
A 145º to 155º F. thermostat, Fig. 2, is used to provide
quick warming and to prevent overcooling during normal vehicle operation.
The temperature at which this unit operates is set by the Manufacturer
and can not be altered. The thermostat should be checked first, should
sudden overheating occur, as failure to operate will nearly block the water
circulation. As a check, remove the thermostat and if the overheating
is eliminated, install a new one.
HEAT INDICATOR
The heat indicator is of the hydraulic type and is connected to a bulb
mounted in the water chamber of the cylinder head, by a capillary tube.
Should this unit fail to operate, it should be replaced as it is not practical
to either repair or adjust it.
WATER PUMP
The water pump assembly Fig. 15 is a centrifugal impeller type, of
large capacity to circulate the water in the entire cooling system.
The sealed type double-row ball bearing is integral with the shaft and is packed at the time of assembly with a special high melting point grease, so requires no lubrication.
FAN BELT
The fan and generator are driven by a “V”-type belt. The drive
is on the sides of the belt, therefore it is not necessary to adjust it
tight, which might cause excessive wear on the water pump and generator
bearings. Adjust the belt by swinging the generator away from the
engine until the belt can be depressed 1” by thumb pressure midway between
the pulleys.
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