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224
FIAT - 850 PASSENGER CARS
Service Data
(continu~d).
Ignition Coil.
MARELL!
BOSCH
O.E.M.
Maker's No.
BE 200 B
TKI2AI7
G 52 S
Primary
winding
resistance at 68°
±
9' F (20' ±5' C)
3.1 to 3.4 Ohms
3.1 to 3.4 Ohms
3 to 3.3 Ohms
Secondary winding resistance at 68
0
I
±9' F (20'±5' C)
6,700 to 8,300 Ohms 7,200 to 8,000 Ohms 6,500 to 8,000 Ohms
Ground insulating resistance at 500
Volts d.c., not below.
50 MQ
50 MQ
50 MQ
- -
- -
- -
Spark Plugs.
MARELLI
CHAMPION
Maker's No.
M 14-19 (CW 240 L)
M 14-19 (N 4)
Thread diarn. and pitch, metric
.
M 14 x 1.25
M 14 x 1.25
Point gap
.0236" to .0276"
.0236" to .0276"
(0.6 to 0.7 rom)
(0.6 to 0.7 rom)
Checking Distributor on Test Bench.
C.ONOENSATORE
.II~
BoBINA
r----------~~,I,"~-
III,
/'II'\;
CAN oHA
BATTERIA
Fig. 348 • Ignition system wiring diagram.
Bobina
=
Coil. - Candela
=
Spark plug. - Condensatore
=
Conden-
ser. - Rutlore
=
Breaker. - Interrutore
=
Switch. - Balleria
=
Battery.
INTERRUTTORE
~--<~
1111111111
+-1'
The ignition system consists-of:
- ignition coil;
_ ignition distributor with breaker, centrifugal
automatic advance and condenser;
vacuUIn advance;
- low and high tension wiring and spark plugs;
- a power supply provided by generator-and-
battery.
The system is subdivided into two circuits
(fig.
348),
namely:
- the low tension circuit or primary circuit,
which includes: the power supply, breaker. con-
denser and ignition coil primary winding;
- the high tension circuit or secondary circuit,
which includes: the ignition coil secondary winding,
distributor rotor
J
distributor cap with terminals and
central brush, high tension cables and spark plugs.
General.
IGNITION DISTRIBUTOR
This unit includes:
the centrifugal automatic advance;
the low tension circuit breaker;
the condenser;
the high tension distributor rotor.
Vacuum Advance.
Vacuum advance device allows of increasing
ignition advance angle against vacuum rate in a
part of carburetor.
Operation test.
Install distributor on tester and connect it to the
variable-speed motor. Wire to an ignition coil and
battery, and connect the four outside cap terminals to
four terminalsofanadjustable point gap spark tester.
Rotate distributor for some minutes in the pre-
scribed direction at a speed of about 2,000 r.p.m.,
keeping the spark tester point gap at some 3/16"
(5 rom).
Then, widen gap to 3/8" (10 rom) ard check if
any sparking takes place in distributor. Aside
from the particular noise produced, such sparks
are revealed either by a drop in intensity or a total
lack of one or more sparks at the tester.
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