tion control switch in the "off" position
and remove the distributor lead.
by use of either primary terminals.
Therefore, apply the distributor lead to
31. Cam Lobe Tests for Fly-ball
one distributor terminal and set the strob-
Governor Spark Advance
oscope protractor ring for the proper dis-
tributor specification setting.
a. Turn the motor switch (17) to the di-
b. Turn the motor switch (17) in the di-
rection in which the distributor shaft is
rection in which the distributor shaft is
driven in the vehicle. Aline the "0" (4-6-8)
driven in the vehicle and adjust the speed
mark on the protractor disk to coincide
control handwheel until the speed meter
with one of the arrow flashes, as shown
indicates 200 rpm. Observe the pattern of
disk on the stroboscope, and turn the syn-
b. Adjust the rpm as indicated in the ap-
chronizing screw (fig. 9) so the closest
plicable TM or manufacturer's specifica-
set of lines may be alined or nearly so.
tion and observe the arrow flashes opposite
Adjust the synchronizing screw until the
t h e tester protractor disk to determine
best match of all lines are achieved. If
the degree of spark advance. The arrow
there is still more than a one degree jog
f l a s h e s should conform to the spark
in any line, the cam is inaccurate. Check
advance (distributor degrees) speci-
the manufacturer's specification or the
fied.
applicable TM for proper synchronization.
c. Turn the speed control handwheel
Note. Be sure to lock breaker in position after
fully clockwise and set the motor switch
completing adjustment.
in the "off" position and remove the dis-
c. Adjust the distributor speed to 2000
tributor lead.
rpm Alternate the distributor lead and, if
lines now dance and shift, this indicates
32. Cam Lobe Tests for Vacuum
bouncing points at high speed due to weak
Controlled Spark Advance
breaker arm springs or friction in breaker
a. Turn the motor switch (17) to the di-
d. Turn the speed control handwheel
rection in which the distributor shaft is
driven in the vehicle. Adjust the speed of
fully clockwise, set the motor and direction
the distributor to the rpm called for in the
control switch in the "off" position and
applicable TM or manufacturer's specifi-
remove the distributor lead.
cations for the distributor. Clip the vacuum
hose and adjust the vacuum in accordance
34. Shutting Down Tester After Use
with the applicable specification. Release
a. Check to see that the speed control
the vacuum hose clip, connect the vacuum
handwheel (15) and cam angle adjustment
hose to the distributor at the adapter, and
(20) are turned clockwise and counter-
check the spark advance, as indicated in
c l o c k w i s e respectively to their lowest
points.
b. Turn the speed control handwheel (15)
b. Check to see that the motor switch
fully clockwise, set the motor switch in
(17) is in its "off" position.
the "off" position, and remove the dis-
c. Disconnect the power cable (21) from
tributor lead and vacuum hose.
the power source.
d. Wrap the power cable, leads, and vac-
33. Synchronizing Points on Double Coil,
uum hose on the hooks on the sides of the
Double Breaker Arm, and Vertical
tool box (4) and stow the tools and equip-
Type Distributors
ment in the tool box (4).
a. The breaker points on double coil,
e. Place the cover over the tester and
double breaker distributors of the type
secure with the latches.
14