Guide For Finding Starting Motor Troubles - Fiat 411 R Service Manual

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Checks. Operations.
Operational test (under load). woe up agcgrding 50 1-79, 154,
Use a test bench ,1'Ftzfed with a ring-gear having 5
ratio tastween pinion and gear of about 1 to 1'0; moire
some startings of short duration. and check, by
braking the motor until a current of 285 A is rem-17e,;.'
that its torque is about 7,85 to 2,15 kgm (11-14 go
f57ftlb)at1510to?o'10l?PMth = U
79-V A - l -. .e voltage being
Checking motor torque when stopped.
should than deliver a torque of 4,62 to 4,?5 kgm
(33.4 to 34.3 ft.l/5).
_ld?lm; lest Of fl'1OlOF- Clear away the ring-gear, to prevent its meshing
with the pinion.
Shut the starting switch and adjust the terminal
voltage at 24 V.
Motor should then absorb a current not exceeding
30A at 4090 to 5000 R.P.M.
E?@<3?F@m@Qnel run. The mobile contact of e/ectromagnet should perform
a run of 6,4 to 8,45 mm (0.25? to 0.333"); the core
being Of 3,5 {O 10,7 mm (0,331?! {O 0.397").
Motor internal total resistance. The test data of the motor when Sfappgd 5/gow
calculating the motor total res/stance, by the ratio
between the voltage applied and the current, ,4:
40° C (104° F) the resistance should be of 9.0205 to
0,0275 Ohm.
Field col I resistance 1' ) The main field coil resistance (in Series), at 200 c
(58° F), should be of 0.0060 to 0.00%? Ohm,
2) The secondary field coil resistance (shunted), at
2:100 (saw-') should be of 1 to mt Ohm,
C0" FQSESHHCE. The efesffofnagngf fesjsl'an€e) at /680;)
should be of 1.36 to 1.46 Ohm. '
Mechanical characteristics.
See data on page 115.
Guide for finding starting motor troubles.
Faults in the charging system may he localized either in the electric motor or somewhere else in the
system; it is the-retore necessary to localize trouble first in order to avoid a waste of time by lookm 1°
g or
faults in the electric motor not being there or clue to outside causes, so that repairs would be use-less
as trouble would repeat itself.
Therefore, if cranking is very slow or absent, the defect must be localized. To this end, as engine is
stepped, the headlights can be used.
Comparativeiy scarce illumination can be traced to low battery charge, damaged cables, or terminals not
lightened. Naturally, the check is made taking for granted that the headlight circuit and its Cflmponenfjs
are efficient and without tension losses for poor contacts at the switches, bulb-sockets, etc.
It happens less often that the recharge plant is defective, and this may be ascertained through the regulator
checks. Anyway, the battery recharge, without having found out the causes, will not eliminate the trouble
that will repeat.
Stop the test bench ring gear; switch on, and aajigysf
voltage to motor terminals, so that . - ' 1 ' will ecsorh a
current of 620 A at I2]-13 V. The starting motor