the correct gap setting and sion.
ten-
c, Test the coil, condenser, and breaker points in the following sequence:
b. Since the output of the ignition secondary circuit is limited by the strength of the pri. mary circuit, extra resistance in the primary circuit reduces output.
(1) Remove the high tension wire from the coil and install a jumper wire 12 inches long, in its place. Tum the ignition switch "ON." Hold the end of the jump-. er wire %6 inch from the cylinder head while the engine is being cranked.
( 1) Disconnect the battery wire from the coil (7) and install an ammeter in series at this point. Connect a voltmeter from thehettery negative terminal to ground. Turn the ignition switch "ON." If the ammeter reading is zero, crank the engine to dose the breaker points, Divide the voltage reading by the amperage reading to determine total resistance of the primary circuit.
If the spark jumps this gap regularly. both the coil and condenser are satisfactory. Proceed with (2).
If the spark fails to jump a %6" gap, replace the condenser with one known to be good. If the spark is now satisfactory, the trouble has been corrected. If the spark still fails to jum.p this gap, remove the coil and test the output on a distributor stroboscope. If this test reveals the coil to be unsatisfactory, proceed with (3) .
EXAMPLE: 6.3 volts divided by 5.2 amperes, eql1.als 1 ohm. Total resistance of the ignition primary circuit is normally 1.2 ohms cold or 1.6 ohms when hot
(2) Clean the distributor cap and rotor with lacquer thinner. Replace these parts if any carbon tracks are visible or if the electrodes have eroded to the extent that the rotor gap has been increased.
(2) If the resistance of the primary circuit is higher than normal, leave the ammeter connected in series and connect the vo1tmeter in parallel in tum to each of the units in the circuit. Replace units having high resistance.
Replace the rotor if there is any indication that it shorts through to the distributor shaft under load.
Normal resistance of the individual units is: UNIT HOT Ignition switch .. 0.02 ohms Ignition coil (primary) .. , .. 1.40 ohms
Make sure aU high tension wire terminals are soldered to the wires and that their terminal sockets are free from corrosion.
COLD 0.02 ohms
(3) Replace the distributor points if they are burned or misaligned, Establish the correct dwell on the distributor stroboscope. Reset the distributor timing,
1.15 ohms
If the trouble still exists, proceed as follows:
SPECIFICATIONS Distributor Part No.
Models
Basic Timing 450-'t7S rpm
FDN 12127A
501, 601 , 701
Degrees B.T.D,C.
FDN 12l27A
801, 901,
5 Degrees
1801
4
Advance at 1200 rpm
Advance
12-14 Degrees
2200 rpm 24 Degrees
14yz-16yz
22002400 rpm 26-28
Degrees
Breaker Arm Spring Tension
Dwell 450-475 rpm
End Play
Rotation
0.0240.026
17·20 oz.
27°_.31°
0.024"_ 0.046"
Clockwise
0.024· 0.026
17-20 oz.
58-63
0,026 w• 0.037'
Clockwise
Point Spacing
Degrees
86
