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10-36
GENERATING SYSTEM
ELECTRICAL SYSTEMS
(312)
CONTACT
SUPPORT
MOUNTING SCREWS
Figu
re
10-31-Adjustment of Voltage Regulator Air Gap
d. Adjustment of Voltage or Current
Re
gulator
The
voltage and current regulators require
two checks and adjustment; air gap and volt-
age or current setting.
1. Push armature down to the core and
slowly release it until the con tact
points
just
touch, then measure air gap between armature
and center of core, using feeler
gauge.
Air gaps
should be as follows:
1948 Current Regulator
080"
1948 Voltage Regulator
070"
1949 C
&
V Regulators
075"
2. Adjust air gap on each unit, if neces-
sary, by loosening contact support mounting
screws and raising or lowering support as re-
quired
.
Be
sure
points are lined up when tight-
ening screws, then recheck gap after
adjust-
ment. See figure 10-31.
3. Check and adjust voltage and current
settings as described in paragraph 10-29, after
installation of regulator on car, or while con-
nected to a proper test generator a
nd
battery.
e. Replacement
of
V
olt a g e or Current
Reg
ulator
A
rmature
Springs -
1948
Model
When
either
regulator unit is badly out of
adjustment or
requires
new
armature springs,
the following procedure must be used to assure
equal tension on both springs, since improper
operation may result if one spring has greater
tension than the other. Although all armature
springs are identical there is some variation in
tension when new, and
some
variation in posi-
tion
of spring hangers
usually
exist s.
The regulator must be correctly
connected
to
the proper type generator and battery.
If
regu-
lator is connected to test generator and battery
on the bench, the regulator must
be
mounted
in
the
same position as it is installed on
car.
If
r
egulator
is reinstalled on car
be SUTe
to polar-
ize
th
e genemtoT before
startisu) engine . In
either case,
the regulator must be brought to
operating t
emperature
(150
0
or very hot to
hand) before adjusting spring tension.
1.
On
CUTTent
r
eaulator
unit, install one
spring only. Connect an ammeter in series with
"BAT" terminal of regulator and the wire
leading to battery. Connect jumper wire be-
tween
upper contact and armature of voltage
regulator (fig. 10-23). With generator operat-
ing
at 2600 RPM (1400 RPM of engine) adjust
spring tension by bending low
er
spring hanger
up or down until current regulator unit
op-
erates at approximately 17 amperes. Next install
the other spring and adjust its spring tension
to obtain 35 amperes hot, without
again
touch-
ing th
e
first spring. Remove jumper
wire.
2. On voltage requlator unit, install one
spring only. Connect an ammeter in
series
with
"BAT"
terminal
of regulator and wire leading
to battery. Connect
voltmeter
test leads to ter-
minal. marked "GEN" and to ground on regu-
lator base
plate.
Open voltage regulator points
by hand, then slowly increase generator speed
until
voltmeter
reads approximately
3 volts.
Maintain this speed, release armature and ad-
just lower spring hanger to obtain 3.5 volts.
Install the other
spring,
t
emporarily
install
regu
lator
cover and bring regulator up to op-
erati
ng
temperature then adjust tension of sec-
ond sp
r ing
to obtain 7.4 volts without
again
touching th
e
first
spriru),
For this final adj
ust-
ment use t
he
procedure with variable
resistance
described in paragraph 10-29 (c).
3.
After
installation of spTings and
adjust-
m
ent
of
either
regulator, install regulator cover
and gasket, bring
regulator
up to operating
temperature
and r
ech eck
set ti ngs with regu-
lator hot.
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