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TM 10-3930-653-14&P
First turn out set screws I to 1.5 turns at contact arm
and primary lead wire connection just far enough to pull
out primary lead terminal.
Referring to Fig. 7-58 unscrew two contact set
screws and remove lead wire.
While holding contact arm with fingers, pull out
contact set toward you by raising it slightly. Contact point
and arm can then be removed together.
Install new contact point and arm assembly In
reverse sequence of removal. Coat cam heel and cam
shaft head with a light coating of grease.
Fig. 4-208. Measuring Point Gap
Fig. 4-209. Disassembling Contact
Arm and Contact Point
(3) CONDENSER
Satisfactory performance of ’condenser depends on
capacity and degree of insulation. requiring attention to
be sure that terminals are clean and set screws are tight.
Checking of condenser is made by a capacity tester.
This can also be made by a circuit tester with its range
set to high resistance reading. When needle of tester
swings *violently and then moves back to "infinite"
gradually. It Is an indication that the condenser is in good
condition.
If needle shows any steady reading or if it registers
zero. the likelihood is that the condenser is out of order.
calling for replacement.
(4) ADVANCE MECHANISM
D413-99
Start
rpm
625
Centrifugal
Intermediate
degree/rpm
-
Advance
Maximum
degree/rpm
15/1,550
performance
characteristics
Start
mmHg (inHg)
150 (5.91)
Vacumm
Intermediate
degree/-mmHg (-inHg)
8.5/300 (I 1.81)
Maximum
degree/-mmHg (-inHg)
11.25/390 (15.35)
Vacuum advance mechanism mechanical parts
If vacuum advance mechanism fails to operate
properly, check for the following Items and correct the
trouble as required.
(1) Check vacuum inlet for signs of leakage at its
connection. If necessary, retighten or replace with a new
one.
(2) Check vacuum diaphragm for air leak.
If leak is found, replace diaphragm with a new one.
(3) Inspect breaker plate for smooth movement.
If plate does not move smoothly, this condition could
be due to sticky steel balls or pivot. Apply grease to steel
balls or, if necessary, replace breaker plate as an
assembly.
4-116
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