1977 DATSUN PICK-UP light

ENGINE

LUBRICATION
SYSTEM

SERVICE
DATA
AND

SPECIFICATIONS

Oil

pump

Standard
Wear
limit

mm
in
0
04
to

0
08

0
0016
to
0
0032

less
than
0
12
0
0047

0
15
toO
21

0
0059
to
0

0083
0
20

0

0079

0
20

0
0079

0
5

0

0197
Rotor
side
clearance

rotor
to
bottom
cover

Rotor

tip
clearance
mm
in

Outer
rotor
to

body
clearance
mm
in

Oil

pressure
regulator
valve

Oil

pressure
at

idling

Regulator
valve

spring

Free

length

Pressured

length

Regulator
valve

opening

pressure
kg
cm2

psi
0

8
to
2
8

II
to
40

mm
in

mmOn

kg
em2

psi
52
5
2
067

34
8
1
370

3
5
to
5

0
50
to

71

Tightening
torque

Oil

pump
bolt

Oil

pump
cover
bolt

Regulator
valve

cap
nut
kg
m
ft
lb

kg
m
ft
lb

kg
m
ft

Ib
1
1
to
1
5
8
0

to
10
8

0

7
to
1

0
5
1

to
7
2

4
to
5
29

to
36

TROUBLE
DIAGNOSES
AND
CORRECTIONS

Condition
Probable
causes
Corrective
actions

Oil

leakage
Damaged
or
cracked

body
cover

Oil

leakage
from
gasket

Oil

leakage
from

regulator
valve

Oil

leakage
from
blind

plug
Replace

Replace

Tighten
or

replace

Replace

Decreased
oil

pressure
Leak
of
oil
in

engine
oil

pan

Dirty
oil
strainer

Damaged
or
worn

pump
rotors

Faulty
regulator

Use
of

poor
quality
engine
oiL
Correct

Clean
or

replace

Replace

Replace

Replace

Warning

light

remains
on

engine
running
Decreased
oil

pressure

Oil

pressure
switch
unserviceable

Electrical
fault
Previously
mentioned

Replace

Check
circuit

Noise
Excessive
backlash
in

pump
rotors

Replace

EL
5

Engine
Fuel

CARBURETOR

CONTENTS

DESCRIPTION

EF
14
CHOKE
UNLOADER

EF
23

STRUCTURE
AND

OPERATION
EF
14

ELECTRIC
AUTOMATIC
CHOKE
EF

24

PRIMARY
SYSTEM

EF
15
INTERLOCK
OPENING
OF
PRIMARY
AND

SECONDARY

SYSTEM
EF
16
SECONDARY
THROTTLE
VALVE

EF
24

ANTI
DIESELING

SYSTEM
EF
17
DASH
POT

EF
25

FLOAT

SYSTEM
EF
18
ACCELERATING
PUMP

EF

25

BOOST
CONTROLLED

DECELERATION
ANTI
DIESELING
SOLENOID
VALVE

EF

25

DEVICE

B
C
D
D
EF
1B

B
C

D
D
CIRCUIT
WITH

FUNCTION

ELECTRIC

AUTOMATIC

CHOKE
EF
20
TEST

CONNECTOR

EF
25

DASH
POT
SYSTEM
EF
20

ALTITUDE
COMPENSATOR

ALTITUDE

COMPENSATOR

California
modelsl
EF

29

California

models

EF
20
MAJOR
SERVICE

OPERATION
EF

29

ADJUSTMENT
AND

INSPECTION
EF
21
REMOVAL
EF
29

CARBURETOR
IDLE
RPM
AND
DISASSEMBLY
AND
ASSEMBLY
EF

30

MIXTURE

RATIO

EF
21
CLEANING
AND

INSPECTION
EF
34

FUEL
LEVEL

EF
22
SERVICE
DATA
AND

SPECIFICATIONS
EF

35

FAST

IDLE

EF
22
TROU8LE

DIAGNOSES
AND

VACUUM
BREAK

EF
23
CORRECTIONS
EF

36

DESCRIPTION

The

carburetors
are
of

down
draft

two

barrel

types
which

produce
the

optimum
air
fuel
mixture
under

all

operating
conditions

They
present
several

distinct

features
of

importance
to
the

vehicle

owners

A

summary
of
the

features
is

as

follows

1
A

slow
economizer
to

make
a

smooth

connection
with

acceleration

or
deceleration

during
light
load

run

ning

It

also

assures
stable
low

speed

performance

2

An
idle

limiter
to

reduce
harmful

exhaust
emissions
to

a
minimum
3
A

B
C
D

D

device
for

reducing

hydrocarbon
H
C
emissions

4

An

electric
automatic

choke
to

facilitate
cold

starting
and
to
reduce

exhaust
emissions

5

An
anti

dieseling
solenoid
to

eliminate

dieseling
run

on

6
A

power
valve

or
vacuum
actu

ated
booster
to

ensure

smooth

high

speed
operation

7

The

carburetor

comes

equipped

with
dash

pot
which
ensures

smooth

deceleration

without

engine
stall

under

all

operating
conditions

8

The
hand

operated
altitude

com

pensator
is

installed
in
the
California

models

EF
14
STRUCTURE
AND

OPERATION

These

carburetors
consist
of

a

primary
system
for

normal

running

and
a

secondary

system
for
full
load

running

A

float

system
common
to
both

primary
and

secondary
systems
a
se

condary
switch

over
mechanism

an

accelerating
mechanism
etc
are

also

attached

An

anti

dieseling
solenoid
valve

and

a

power
valve
mechanism
are
also

installed

The
hand

operated
altitude

com

pensator
corrects
air

fuel
mixture

to

an

optimum
ratio

Engine
Fuel

1
L

if

1

Pump
injector

2
Piston

3

Spring

4

Weight

5

Damper
spring

6
Piston
return

spring

7

Inlet
valve

8
Outlet
valve

EF023

Fig
EF
26
Acceleration

mechanism

Power

valve
mechanism

SECONDARY
SYSTEM

The

power
valve

mechanism
so

called
vacuum

piston

type
utilizes

the

vacuum
below
the
throttle
valve

When
the

throttle
valve
is

slightly

opened
during
light
load

running

high

vacuum
is

created
in

the
intake
mani

fold
This

vacuum

pulls
the

vacuum

piston
upward

against
the

spring

leaving
the

power
valve
closed
When

the
vacuum
below
the
throttle

valve
is

lowered

during
full
load
or

accelerat

ing

running
the

spring

pushes
the

vacuum

piston
downward

opening
the

power
valve
to
furnish

fuel
Secondary
main

lIYlltem

pulled
out

through
the
main

nozzle

into
the
small
venturi

Due
to
the

double
venturi

of
the

secondary
system
the

higher

velocity

air

current

passing
through
the
main

nozzle

promotes
the
fuel
atomization

The
structure
is

almost
the

same
as

the

primary
side
The

secondary
main

system
is

a

Stromburg
type

Fuel
air
mixture

produced
by
the

functions
of
the
main

jet
main
air

bleed

and
emulsion
tube
in

the
same

manner
as
in

the

primary
system
is

11
1

I

1

1

Primary
vacuum

port

2

Secondary
vacuum

port

3

Diaphragm
chamber

cover

of

Diaphragm

spring

S

Diaphragm

6

Secondary
throttle

valve

7

Primary
theo
nle

valve
lWll
I

1
11

l
v
1

Vacuum

piston

2

Power

valve

ET02
a

EF
512

Fig
EF
27
Sectional

view

of

po
r

valve

Fig
EF
28
Full
throttle
al

high
peed

EF

16

ELECTRIC
AUTOMATIC

CHOKE

An
electric
heater
wanns
a
bi
metal

interconnected
to
the
choke
valve
and

controls
the

position
of
choke
valve

and
throttle
valve
in
accordance
with

the

time

elapsed
the
warm

up
condi

tion

of
the

engine
and
the

outside

ambient

temperature

When
outside
ambient

temperature

is

above

operating
temperature
the

automatic

choke
control
serves
to
fur

ther
reduce
exhaust

gasemission

during
warm

up
by
automatically

selecting
one
of
the
two

choke

opera

tion
modes
fast

acting
or
slow

acting

Slow

acting
choke

operation

When
ambient

temperature
is
low

electric
current
flows

through
the

automatic

choke

relay
to
the
P
T
C

heater
A

and

gradually
warms
the

bi

metal
This
causes
the
choke
valve

to

open
slowly

Fast

acting
choke

operation

When
ambient

temperature
is

high

the
bi
metal
switch
is
in

on
This

causes
electric

current
to
flow

through

the
automatic

choke

relay
to
the

P

T
C
heater
A
and
heater

B
result

ing
in

quick

opening
of
the

choke

valve

r

@@

r

@
Engine
Fuel

The

construction
and

function
of

each

part
of

this
carburetor
are
as

follows

l
Bi
metal
and
heater
in
choke

cover

Electric
current

flows

through
the

ttea
r
as

t
le
engine
tl

1
SI
nd
war

the
bi
metal

The
deflection
of
the

bi
metal
is
transmitted
to
the
choke

valve

through
the
choke

yalve
lever

2
Fast
idle
cam

The
fast
idle

cam
determines
the

opening
of
the
throttle
valve

so
that

the

proper
amount
of

mixture
cor

responding
to
the

opening
of
the

choke
valve
will
be
obtained
The

opening
of
the

choke
valve
is

depend

ent

upon
the
warm

up
condition
of

the

engine

3

Fast
idle

adjusting
screw

This

screw

adjusts
the

opening
of

the
throttle

valve
of
the
fast

idle
earn

4
U

nloader

When

accelerating
the

engine
during

the

warm

up
period
that
is

before
the

choke

valve

opens
sufficiently
this

unloader
forces

the
choke
valve

open
a

liUle
so

as
to
obtain

an

adequate

air
fuel

mixture

5

Vacuum

diaphragm

After

the

enginThas
been

started

by
cranking
this

diaphragm
forces

the

choke
valve

open
to
the

predetermined

extent
so

as
to

provide
the

proper

air
fuel
ratio

6
Bi
metal

case
index
mark

The
bi
metal

case
index
mark
is

used

for

setting
the

moment
of
the

D

Il

EF232

1

Alternator

2
Automatic
choke

relay

3
Automatic
choke
cover

4
P

T
C
heater
A

5
Bi
metal
switch

6
P

T
C
heater
B

7
Bi
metal

8
Choke
valve

Fig
EF
33
Schematic

drawing
of
electric
automatic
choke
heater

EF

20
bi
metal
which

controls
the
air

fuel

mixture
ratio

required
for

starting

DASH
POT

SYSTEM

These
carburetors
are

equipped

with

a
dash

pot

interl
ked
wi
h

the

primary
throttle

valve

through
a
link

mechanism
The

dash

pot
is
intended

to

prevent

engine
stall

resulting
from

quick
application
of
the
brake
or

from
the

quick
release
of
the
accele
ra

tor

pedal
after

treading
it

slightly

In

such
a

situation
a
throttle
lever

strikes

against
the
dash

pot
stem
and

makes
the

primary
throttle
valve
close

gradually
thus

keeping
the

engine

running

ALTITUDE
COMPENSATOR

California
models

The

higher
the
altitude
the
richer

the
air

fuel
mixture
ratio
and
there

fore
the

higher
exhaust

gas
emissions

even

though
the

engine
is

properly
ad

justed
for
low

altitude

driving

The
altitude

compensator
is

design

ed

to
meet
EiiriSSion
S13ndards
for

driving
in
both
low
and

high
altitudes

At

high
altitudes
additional
air
is

sup

plied
to
the
carburetor

by
the
altitude

compensator
When
the
altitude

com

pensator
lever

is
set
at
H
air
is

conducted

through
an
air

passage
to

the

carburetor
The
air

passage
is

closed
when
the
lever

is
set
at
L

H

L
Lever

When

operating
the
H

L
lever
fol

low
these

instructions

H

position

Should
be
used
for

general
driving

in

those
areas

designated
by
law

as

High
Altitude
Counties

L

position

For
use
outside
those
areas

desig

nated
as

High
Altitude
Counties

Minimizes
exhaust

gas
tempera

lure
rise

2
Minimizes

horsepower
losses
re

suiting
from
air

injection
into
the

exhaust

system

3
Protects

pump
from
excessive

back

pressure

The
air

pump
relief
valve
is
installed

as
shown
in

Figure
EC

20

The

secondary
air
is

discharged

from
the
air

pump
relief
valve

to
the

dust
side
of
the
carburetor
air
cleaner

To
carburetor

air
cleaner

Secondary

air

To
carburetor

air

cleaner

J
erCOndary

r

r

EC294

Fig
EC
20
Air

pump
relief
valve
Emission
Control

System

Emargency
air
retial
valve

E
A
R
Valve

California
models

The

emergency
air
relief
valve
con

trols
the

quantity
of
secondary
air

fed

from
the
air

pump
according
to

load

condition
and
it

discharges
the
see

ondary
air
into
the

atmosphere
to

prevent
overheating
of
the

catalytic

converter

The

emergency
air
relief
valve
con

sists
of
a

diaphragm
a

spring
and

a

valve
which
is

coupled
to

diaphragm

1

Diaphragm

2

Val

3

Spring

4

Diaphragm
chamber

EC536

Fig
EC

21

mergency
air

relief
valve

OPERATION

As
mentioned

previously
there

are

two

types
of
Air

Injection
Systems

A
I

S
a

non
California

type
and
a
California

type
The
California
stand

ard

type
includes
a

system
which

controls

injection
of

secondary
air

so

as
to
assure

proper
function
of
the

catalytic
converter
and
a

system

which
controls
the

supply
of
second

ary
air
to

prevent
abnormal

tempera

tUfe
rise
in
the

catalytic
converter

The
A
I
S
consists
of
the

following

systems

L
A

system
which
allows

injection

of

secondary
air
into
the
exhaust

port

2
A

system
which

bypasses
sec

ondary
air

from
the
air

pump
relief

valve

to
the

carburetor
air

cleaner

during

high
speed
engine
operation

3
A

system
which

supplies
air

from

the
carburetor
air
cleaner

to
the
intake

manifold

by
means
of
the
anti

backfire

valve
so
as
to

prevent
after
fire

during

deceleration

4
A

system
which

controls

injection

of
the

secondary
air

by
means
of
the

air

control
valve

so
as
to
maintain
the

catalytic
converter
at
an

optimum

temperature
level
under

lightly
loaded

condi
tions

Califomia

type
only

5
A

system
which
controls
the

sup

ply
of

secondary
air

through
the
emer

gency
air

relief
vilve

io
pfevent
ab

normal

temperature
rise
of
the

cataly

tic

converter

California

type
only

A
I

S

operation
is

as
follows

I

I

t

1
r

9

I
Air

pump
6

Check
valve

I
0
L
2
Air

pump
air
deaner
7
Air

gallery
pipe

3
Air

relief
valve
8
Injection
non
e

r
4
Air
cleaner
9

Exhaust
manifold

5

Carburetor
10

Anti
backflIe
valve

EC179

Fig
EC
22
Non

California
type
A
I
S

EC
12

EC540

Fig
EC

38
Install

carbon
shoe

Notes

a

Carbon
shoe
A

is
1
mm
0
039

in

wider
than
B

Do
not
confuse

them

b
If
carbon

shoes
are

exposed
beyond

the
rotor

end
face
remove

carbon

shoes
and
clean
shoe

grooves

Reassemble

carbon
shoes

6

Vane

1
Pack
vane

bearing
with

high

melting
point
grease
MIL
G
3545
A

Esso

ANDOK260
or

equivalent
and

insert

dummy
shaft
into
the

Vane

bearing

STl9900000

EC563

Fig
EC
39
Vane

assembly

2
Install
vane
in

place
on
rotor

using

Dummy
Shaft

STl9900000
as
a

guide

Note
The
vanes

may
require
6
to
16

km
4

to
10

miles
wear
in

running

time
In
the

event
a

slight
squeaking

still

remains
drive
the
car
about
64

to
80
km
h
40
to
50

MPH
In

most

cases
6
to
16

km
4
to

10

miles
will
be
sufficient

for
wear
in

7

Shoe

spring

Place
shoe

springs
in

deeper
groove

of
shoe
Emission
Control

System

i

111

11

EC123

Fig
EC
40

Installing
shoe

spring

Note
When

instaUing
a
shoe

spring

make
sure
that
the
outward
bend

ing
side

faces
in

shoe
and
that
both

ends

of

spring
face
in
the

wall
of

shoe

groove

Be
sure

to

push

spring
in

so
that

spring
end
face
is
flush
with

rotor

8
Rotor

ring

Install

rotor

ring
by
correctly
align

ing
the
rear
end

face
of
rotor

with
the

0
mark

in
rotor

ring
and

tighten

four

screws
to

the

specified

torque

with

Hexagonal
Wrench
ST19810000

Tightening
torque

0
5

to
0
7

kg
m

3
6
to
5
1

ft
lb

5T19810000

EC124

Fig
EC
41

In8talling
rotor

ring

9
Removal
of

dummy
shaft

Carefuny
withdraw

dummy
shaft

from

vane

10

Vane
shaft

Pack

rear

bearing
with

high

melting

point

grease
MIL
G
3545

A

so

ANDOK
260
or

equivalent

Apply
thin

coating
of

grease
to
vane

shaft
and
rotor

ring
and
insert

vane

shaft

into
its

bearing

EC
17
Notes

a

Do
not

apply
an
u
tue
stress

to

vane
shaft
when

inserting

b

If
two
vanes
are
dislocated
when

inserting
vane
shaft

correctly

align

vanes

by
inserting
dummy
shaft

Then
draw
out

dummy
shaft
and

insert
vane

shaft

c
When

wear
occurs
on
vane
shaft

or

when

replacement
of

rear

bearing
is

necessary
replace
rear
cover
as

sembly

Jl
End
cover

Position
end

cover
in

place

Snugly

tighten
the
bolt
close
to

the
dowel

Then

tighten
four
bolts

to
the

speci

fied

torque

Tightening
torque

0

7
to
0

9

kg
m

5

1

t06
5
ft4b

EC302

Fig
EC
42
Insla
ling
end

cover

12

Pulley

Tighten
four

pulley
securing
bolts

to
the

specified
torque

Tightening
torque

0
7
to
0

9

kg
m

5

lt06
5
ft

lb

INSPECTION

Air

InJection
system
hosas

Check
air

system
hoses
for
loose

connections
cracks
or
deterioration

Retighten
or

replace
if

necessary

Air

ystem
manifold

Check
air

gaUery

pipe
and

injection

nozzles
for
loose
connections
and

cracks

Retighten
or

replace
if
neces

sary

Air

pump

I

Operate
engine
until
it
reaches

normal

operating
temperature

2

Inspect
all
hose
hose
connec

tions
and
air

gallery
for
leaks
and

correct
if

necessary
before

checking

air

injection

pump

3
Check
air

injection
pump
belt

tension
and

adjust
to

specifications
if

necessary

4

Disconnect
air
supply
hose
at

check
valve

5

Disconnect
vacuum
hose
from
the

air

control
valve
California

type

only

6
Insert

open
pipe
end
of
Air

Pump

Test

Gauge

Adapter
STl9870000
in

air

supply
hose

Clamp
hose

securely

to

adapter
to

prevent
it
from

blowing

out
Position

adapter
and
test

lli
uge
so

that
air
blast
emitted

through
drilled

pipe
plug
will
be

harmlessly

dissipated

7
Install

a
tachometer

on

engine

With

engine
speed
at
2

600

rpm
ob

serve

pressure
produced
at

test

gauge

Air

pressure
should
be
100

mmHg

3

94

inHg
or
more

8
If
air

pressure
does

not
meet

above

specifications
proceed
as
fol

lows

I

Repeat
2
and
3

above

2
Disconnect
air

supply
hose
at

anti
backfire
valve

Plug
air

hose

open

ing
and

screw
with
a

clamp
Repeat

pressure
test

3
With

engine

speed
at
1

500

rpm

close
hole
of
test

gauge
with

finger
If

a

leaking
sound

is
heard
or

leaking
air

is
felt

by
ftnger
at
relief

valve
relief

valve
is

malfunctioning
Relief
valve

should

be

replaced
or

repaired

4

If
air

injection
pump
does
not

meet
minimum

requirement
of

pres

sure
test
it

should
be

replaced

Control
valve

The

following
procedures
are
reo

commended
for

checking
and
or
as

certaining
that
the
various

components

of
the
exhaust
emission
con
Irol

system

are

operating

properly

The

engine
and
all

components

must

be
at
normal

operating
tempera

tures
when
the

tests
are

performed

Prior

to

performing
any
extensive

diag

nosis

of
the
exhaust
control

system
it
Emission
Control

System

must
be
determined
that

the

engine
as

a
unit
is

functioning
properly

Check
valva

Warm

up
engine
thoroughly

2

Disconnect
hose

leading
to
check

valve
from
air

hose
COJUlector

3

Check
hose

opening
for

any
indi

cation
of
exhaust

gas
leaks
Ifleaks
are

detected

replace
check
valve

4

Race
the

engine

lightly
at
about

2
000

cpm
and
then

return
it
to

idling
VisuaDy
check
the
hose
for

any

indication
of
exhaust

gas
leaks
before

the

engine
returns
to

idling

speed
If

leaks
are
detected

replace
check
valve

EC310

Fig
EC
43

Checking
check
valve

Air

pump
raIle
valve

After

completing
inspection
of
air

pump
check
air

pump
relief
valve
in

the

following
steps

J

Disconnect
hoses

leading
to
check

valve
and
air
control

valve
from
air

hose

connector
and

install
blind

cap

to
the

connector

2
With

engine
running
at

about

3
000

rpm
under
no
load

place
your

hand
on
the
air

outlet
of
air

pump

relief
valve
to
check
for

discharged
air

If
no
air

is
felt

replace
the
air

pump

relief

valve

EC311

Fig
EC
44

Checking
air

pump
relief

valve

EC

18
Air
control
valve

C
U
ornla
models

I
Warm

up
engine
thoroughly

2
Before

checking
air
control

valve

check
all
hoses

for
loose
connection

leaks
etc
and

repair
or

correct
if

necessary

3

With

engine
idling
disconnect
the

outlet
side
hose
of

the
air
control

valve
and

place

your
hand
on
the
air

hose
outlet
to
check
for
air
If
no
air
is

felt

replace
the
air

control
valve

4

Pull
vacuum
hose
off
from
air

con
trol
valve
If

discharge
of
air
from

air
hose

stops
the
air
con
trol
valve

is

normaL
If

discharge
is
still
felt

replace

the
valve

Plug
up
the

removed

vacuum
hose

to

stabilize

engine
running

EC312

Fig
EC
45

Checking
air
control
valve

Emarsancy
air
rella
valve

E
A
R
Valve

lCalHornla
models

L
Warm

up
engine
thoroughly

2

Before

checking
air

control
valve

check
all
hoses
for
loose
connection

leaks
etc
and

repair
or
correct
if

necessary

3
Race

engine
approximately

2
000

rpm
under
no
load
Place

your

hand
on
air

outlet
of
E

A
R
valve
to

check
for

presence
of

discharged
air
If

no
air

is
felt

E
A

R
valve
is
normal

4

Disconnect
vacuum
hose
from

B
A

R
valve
as
shown
in

Figure
EC

46

j

EC231

Thermal

vacuum
valva
o

o

m
Emission

Control

System

0

o

o

o

l

l
@

The
thermal
vacuum
valve

is

mounted
in

the

engine
thermostat

housing
It

detects

engine
coolan
t

tem

perature
by
means
of
a

built
in

bi

metal
and

opensor
closes
the

vacuum

passage
in
the

thermal
vacuum

valve

mt

li

t

00
t

EC232

Fig
EC
54
Thennal

vacuum
valve
To
E

G
R
control
valve

From
carburetor

1

Spring

2
Bi
metal

3

O

ring

E
G
R

warning

system

The

E
G
R

warning
system
install
1

Diaphragm
spring

2

Diaphragm

3
Valve
shaft

4

Valve

5
Valve

Seat

6
Valve
cham
ber

Fig
EC
53
E
G

R
control
value

When
the

vacuum

passage
is

open
the

carburetor
suction

vacuum
is

applied

to
the

diaphragm
of
the
E
G
R

con

trol
valve
to

actuate
the

taper
valve

connected
to
the

diaphragm

theconsiiiictlo

nlie
thermal

vacuum
valve
is

shown
below

ed

independently
of
the

E
G
R

con

trol

system
monitors

the
distance
the

car
has
travelled
and

indicates
when

EC
22
the
E

G
R

control

system
must
be

checked

The
E
G
R

warning
system
consists

of

an
odometer
switch

detector
drive

counter
E

G
R

warning

lamp
and

harnesses

When
the

earn
in
the

odom

eter
switch
connected
to

the

speed

ometer
turns

once
for

each
OAkm
4

mile
the

contact

point
of
the
elec

trica
circuit
closes

allowing
electric

current
to
flow

through
the

magnet

coil
of

the
detector

drive
counter

Thus

energized
the

magnet
coil
ac

Wates

the
latchet
to

turn
the
c
unter

wheel

by
one

pitch
When
the

number

of

counts
reaches
50
000
the
latchet

drops
in

a

groove
provided
on
the

periphery
of

the
counter
wheel
to

activate

the
detector

drive
counter

switch

Then
the

E
G
R

warning

lamp

comes
on

indicating
that
the
E
G
R

control

system
Should
be
checked

The

detector
drive

coun
teT
is

equip

ped
with
an
odometer
which

can
tell

when
to
service

the
E

G
R
contr0
I

system

After

completing

periodic
check

reset
the
odometer
to

zero
by
hand

proceeding
as
follows

1
Remove

grommet
installed
on

the
side

surface
of

detector
drive

counter
unit

2
insert

a
bar

or
a
screwdriver

tip

into
the

hole
from

which

grommet
has

been

removed
and

press
down
knob

provided
in

the
detector
drive
counter

for

resetting

The
E

G
R

warning

lamp
comes

on

under
the

following
circumstances

1
When
the
number
of

counts
has

reached
50
000
In
this

case
the

lamp

indicates
that
E

G
R

control

system

must
be
checked

2
When

operating
starter
motor

Notes

a
It
is

an
indication
of

problem
in

the

E

G
R

warning
lamp
or

problems

in
the

point
or
in
the
harnesses
if

the

lamp
does
not

light
at

50
000

counts

b

The
E

G
R

warning
system
is

mounted

on
all
620
models

except

those

bound
for
California
and

Canada