Removal and Disassembly. - TM-10-3930-624-120079

Figure 4-30. Timing light connections.

the movement of the flywheel timing mark. If the spark

(5) Connect the hot lead of a tachometer to

advance is functioning properly, the mark will move

the positive lead on the coil and connect remaining lead

counterclockwise on the flywheel during acceleration

to ground.

and drop back as the engine decelerates to idle

(6) Start the engine and, using the idle

speed.

adjusting screw, lower the idle speed until there is no

c. Removal and Disassembly.

apparent distributor advance or retard (approximately

300 to 350 rpm).

(1) Remove spark plug leads from spark

(7) Direct the timing light at the timing hole in

plugs and remove ignition coil lead from coil.

the flywheel housing and rotate the distributor to set

Remove primary lead from coil.

timing to TDC.

(2) Remove capscrew and washers from

(8) Increase the idle speed to 400 RPM.

distributor advance arm and lift distributor out of drive

(9) With the timing light, again check flywheel

housing.

timing and note whether timing has advanced. Then

(3) Unfasten cap retainer screws and remove

tighten the distributor advance screw.

cap, rotor, and dust shield (fig. 4-31).

(10) After timing is correctly adjusted,

accelerate the engine rapidly a few times and observe

4-31