Fiat 411 R - Starting Motor Troubleshooting

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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

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