varies more than 2 degrees, wear in the
VACUUM CHAMBER DIAPHRAGM TEST.
breaker plate bushing is indicated.
c. Adjust vacuum and distributor speed for
a. Insert the proper adapter in the vacuum
each specified check point in turn and note
chamber and tighten to insure a good seal.
the amount of advance obtained.
b. Connect the test leads and place the lobe
d. Reduce vacuum and distributor speed and
selector switch in the proper position.
again note advance obtained at each spec-
c. Attach hose to vacuum unit and seal hose
ified check point. Consult
with metal clamp.
service manual for specific adjusting pro-
d. Adjust vacuum control until gage reads 5
e . Release hose clamp and observe gage.
Gage will momentarily fall to a lower
DUAL VACUUM CHAMBER LOADOMATIC DIS-
(1) If gage reading returns to 5 inches
There are two types of dual vacuum chamber
within a few seconds, vacuum chamber
LOADOMATIC distributors; an early type used
is air tight.
(2) If gage reading fails to return to 5
later type used more recently on Ford, Lincoln
inches, vacuum c h a m b e r i s l e a k y .
the exception of the advance mechanisms, LOAD-
BREAKER PLATE TEST.
OMATIC distributors are tested in the same
manner as described in the preceding pages.
a. Adjust speed to 1000 rpm.
If a 1953 Lincoln distributor is being tested the
b. With the vacuum control, increase vacu-
control cable on the distributor should be re-
um from 0 to 5 inches while watching
the dwell meter.
If the dwell reading