Engine Mountings - Jeep CJ-3A Owner's Manual

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6. To test the secondary coil circuit, remove the distributor cap and turn the engine until the breaker points are making contact.
Turn "ON" the ignition switch and remove the high tension wire (center wire) from the distributor cap. Hold this wire about one-
eighth of an inch from a clean, unpainted surface of the engine, then open and close the breaker points with the finger, giving
them a short, snappy break. A fat, flame-colored spark indicates the coil is in good condition. No spark indicates the secondary
winding of the coil is open, while a thin, stringy spark indicates an internally shorted coil or a loose or inoperative condenser.
Condenser trouble will also be indicated by badly burned breaker points. Should the test show a thin stringy spark, check the
condenser first. Be sure that the mounting screw is tight and is making a good ground connection to the distributor body and also
that the connecting wire to the distributor points is not broken or the connection loose. Should no trouble be found in the
condenser mounting or connection, install a new condenser which will localize the difficulty in either the coil or the condenser.
No repairs can be made to either the condenser or coil, it being necessary to replace them if inoperative.
MANIFOLD HEAT CONTROL.
The manifolding is designed to utilize the exhaust gases of the engine to provide a quick means of heating the inlet manifold,
thereby reducing the length of time the choke must be used after starting a cold engine and making the engine more flexible
during the warm up period. The heat control valve, Fig. 9, which controls the amount of exhaust gases by-passed around the
intake manifold insures more complete vaporization of the fuel. This control is fully automatic.
The valve shaft should turn freely in the manifold at all times. Note that the thermostatic spring No. 7 should be assembled above
the metal stop No. 8.

ENGINE MOUNTINGS.

The rubber engine mountings, which are attached to the frame side rail brackets and to the support plate, prevent fore-and-aft
motion of the engine, yet allow free sidewise and vertical oscillation which neutralizes vibration at the source. Keep the
mountings tight. A loose engine may cause vibration, clutch chatter or high fuel level in the carburetor.
The rubber surface of the mountings partially insulates the engine from the frame. To assure a positive electrical connection
between the engine and frame, a ground strap is provided at the right front engine support under the generator. See Fig. 10. The
two attaching screws must be kept tight and the connections clean. A loose or poor connection may result in hard engine starting,
low charging rate of the generator or sluggish operation of the starting motor.