Voltage Regulator - Jeep CJ-3A Owner's Manual

In operation (see Fig. 12) clean air flows from the air cleaner through the short connecting tube to the oil filler tube and then
through the crankcase and valve compartment to the intake manifold. Any vapors in the crankcase are carried into the
manifold and burned. Positive air circulation reduces oil temperatures and the formation of moisture due to condensation. Air
flow is controlled at the manifold by the control valve.
Be sure there are no air leaks at tube connection between the air cleaner and oil filler tube, and that the oil filler tube cap
gasket is in good condition. Always keep the cap locked securely in place.
When tuning the engine or grinding valves, remove the control valve and clean it thoroughly. If this valve is blocked with
carbon, the ventilating system will not operate and should the valve fail to seat, it will be impossible to make the engine idle
satisfactorily.
GENERATOR.
The generator is a 35-ampere, two-brush unit which does not require adjustment to increase or decrease output. Output control
is accomplished by the regulator which limits the current generated to that which is required by the battery. The generator
charging rate, as shown by the ammeter, will be low when the battery is well charged and correspondingly higher as charging
is required.
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 discolored, 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 commutator 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; heat as well as voltage and amperage must be considered when adjusting
it. Should trouble develop in the regulator either install a new one or consult a Willys-Overland Dealer.
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