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(3) Regulator tests and "'Mee:s
With the
alternator
unit mounted on the tes:t
bench and coupled to Ihe vari'ble-speed
drive
source (molor).
connect
the regulator
unit
,
as
:shown
below·,
with
two arruneter AJ and
A:i
and
•
vohmeler.
Be
sure
10
use
a
fully charged
24-V
battery
.
Before starling
the
test
operation
,
check
to be
sure
thai
the
resi
stance inside
the regulator
ijIlit between
terminal
IG
and term
inal
F
is
any
-
where be tween about
35
and 41
ohm
s.
This
ohmi
c
value
is
important
:
this much
resistance
means
that resistor
R"
is
in
sound condition and
that
the
point
faces of
contact
Pl
are sm ooth
and
closing.
positively to
pass.
fie
ld
curront
properly
.
RE-Qula
tor
E
Ammeter
A,
Switch Kl
"
•
I (
Voltmu.t r 11
Regu
I
ate r le'St ci rcuit
(a)
Checking for
regula
led
volt.ge
Close switches K.
and
K, and
,tart
driving
the
IIllenlalOr.
Just
when ammeter A. indicatestero
to
,ignify
that the alternator is nOw
in
,eJ[-
t:xcltin
g
condition.
optn swjtch
K4.
Raise the
spe<:d 10
3000
rpm and read
the
vohmeter. The
regut ..
or is properly
"t and
working
saliEf.cto·
riJy
if
this
reading
is
between
28.0
and
31.0
VOllS.
(b)
If the
indication
of amme
ter
A>
remains z.ro,
1t
means
1) t:ont.act
P2
is
not working properly,
or 2) volt,se
coil
YC,
i,
open-drcuited
.
(c) If
Ihe
voltage read on the voltmeter i, outside
the
range
stated above.
despHe
ammet-er
A2
showing
!Orne
field currenl being
supplied to
the
field
,
then
It
means
1) "oltage coil VC, is
open.circuited
, 2)
resistor Rl is open-circuited
,
Or
3)
conlact P, is stuck closed wilh
ils point
faces
fused
logether.
Bench tests
An
overhauled e.ngine
,hould be
operated
on Ihe
t est
bench
in
order
to
correc~y
break it in
,
to
.djust
lhe
engine
and injectIOn
pump
3Jld
governor fO!
besl
engine
performance,
and to
quantitatively determine the output
power the
overhauled engine
is
capable of.
84
The ten bench is an appil.r3tus complete
wit
h
a dynamo-
meter.
In
the foliowinE, procedures.
8
standard· type
test
bench is ."umed
.
(I) Breaking
in
Have the
engine set
up
011
the
bench,
and aligned
to the
dynamometer.
Operate
the
engine
for
a
total
of2 hour::
according to
the schedule
ind
ici3ted
below.
During
this operation, observe the
running
c-ondition carefully and
I
jf
any malcondition
is
noted
to
be
developing, shut
down
tile
engine
and
take
steps
to correct
it.
Breaki
ng·in
s.chedu
le
,- E ·
d
Load
D
uration
o
d
I
ngme spee
r
er
(rpm
)
IPS)
(m
inutes)
I
I
1000
0
30
-
2
1500
7.5
30
3
2000
IS
60
4
2500
20
60
-
-
- - - -
Run
the
engine with
(a)
lube ail pressure held
between 3 and 4 kg/em' (42.7 and 56.9 p,i), (b)
cooling water temperature
he
ld
between
75
0
and
85'C (167' 3lld ISS'F),
(e)
lube oU lem!X''''tpre,
as measured
in
the oU pan
complete
with
i1
vacuum
pump, held between 80' and 9O'C (176' and
194'F).
While lhe engine
is
running,
check 10 be
sure that there
is
no
leakage
of oil. wate.r or
combustion gases., and Iisltn into (he engine now
and
then for abnormal
noise.
For
this.
breaking·in
run
,
start
up the
engine as
fonows:
(a) FiU
up
the cooling
system and
the oil P31l,
and
make
,ure
there Is
enough
fuel
.
Prime
the
fuel
system, lelling ou'
all
lIapped
air,
if
any
.
(b)
Use the preheating
system
to make
SUIt::
that
Ihe glow
pilot lamp works
.
The
lamp
should
glow in
about 20
seconds,
(c)
With
the
Adjusting lever of the governor moved
to
the .1.riing pOSition
,
crank the engine with
Ih.
starter and
,
after slarting up the engine,
move Ihe
adjusting
lever to its idling posilion
_
(d)
With Ih. engine
kepI
in
idling
condition
,
inspect
for
leakage of
oil or wale{, ob,erv.
the color of
exhaust
s.moke,
lis
ten into
the
engine for abnor·
mal noise,
and
check
lube
oil
pressu,.
and
cooling
water
temperature.
Until the
C()oHng water
temperature- rises
to
its
normal operating r"'go,
.
he eogine might develop
sharp knocking.like sound,
but
this is no c.use for
alarm because
it
will
disappear as
the
temperature
rises.
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