Cam Lobe Test for Distributors Without Automatic Spark Advance

Figure 7. Cam angle test connections.

protractor setting knob so a flashing cam

perform the cam lobe test in paragraph

lobe alines with "0" (4 - 6 - 8) mark, as

30, 31, or 32, as applicable.

b. Check the pattern on both speed

30. Cam Lobe Test for Distributors Without

ranges from 200 to 2000 rpm. Image pat-

Automatic Spark Advance

tern should remain steady on the "0" mark.

"Dancing" or misalignment of lines at high

a. Turn the motor switch (17) to the di-

speed only, indicates bounding of points,

rection in which the distributor shaft is

poor contact, weak springs, or friction in

driven in the vehicle and with the distrib-

breaker arm bearing.

utor operating at 200 rpm (par. 29h above),

c. Turn the speed control handwheel

observe the cam pattern on the strobo-

fully clockwise, set the motor and direc-

scope. Adjust the protractor disk with the