SPECIFICATIONS

the correct gap setting and sion. ten-

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) 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. 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) 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. Normal resistance of the individual units is:

UNIT HOT COLD Ignition switch .. 0.02 ohms 0.02 ohms Ignition coil (primary) .. , .. 1.40 ohms 1.15 ohms

If the trouble still exists, proceed as follows: c, Test the coil, condenser, and breaker points in the following sequence:

(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.

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).

(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. Replace the rotor if there is any indication that it shorts through to the distributor shaft under load. Make sure aU high tension wire terminals are soldered to the wires and that their terminal sockets are free from corrosion.

(3) Replace the distributor points if they are burned or misaligned, Establish the correct dwell on the distributor stroboscope. Reset the distributor timing,

Distributor

Part No. Models Basic Timing 450-'t7S rpm Advance at 1200 rpm Advance Point Spacing Breaker Arm Spring Tension Dwell 450-475 rpm End Play Rotation FDN 501, 4 12-14 2200 rpm 0.024- 17·20 oz. 27°_.31° 0.024"_ Clockwise 12127A 601, Degrees Degrees 24 0.026 0.046" 701 B.T.D,C. Degrees

FDN 801, 5 14yz-16yz 2200- 0.024· 17-20 oz. 58-63 0,026w• Clockwise 12l27A 901, Degrees Degrees 2400 rpm 0.026 0.037'

1801

26-28 Degrees

Coil

Number

Primary Ohms Resistance

1.06·1.17 at 75° F. Manifold Vacuum in H.G. at Sea Level RPM No Load

450 18 in.

Condense.!"

Minimum Part Number Capacity Insulation Resistance Power Factor At

7RA-12300-C 21-25 MFD 5 megohms 0.6% at 240"'F. at 210°F. 60 Cycles 70"·75°F.

SPECIAL TOOLS

The following tools should be used when overhauling it distributor and are illustrated in the preceding sections of this manual. TOQl No. Description 12132 ... .. ...... Reamer-Distributor Shaft Bushing 12390·D ........... Fixture-Instalting and Locating Distributor Gear. 12132·C ... ............ Holding Block-Distributor.

Tool No. Description 12132-B-l ...... Remover-Distributor Shaft Bushing. 12390-C ... . ... . .. . . Remover Kit- Distributor Shaft. 12132-E ....... Replacer-Distributor Shaft Bushing. 12151 ......... ..... . Scale-Breaker Point Tension. 2150-E ...................... Tool-Breaker Point PTL-45-1 .......................... Timing Light. A A .............. .... Coil and Condenser Tester.