1969 DATSUN 610 ECU

ALTERNATOR
Dismantling

Refening
to

Fig
M
16
remove

the

pulley
nut
and
take
off

the

pulley
rim
fan
and

spacer
Withdraw
the
brush
holder

retaining
screws
and
remove
the
brush
holder
cover
Withdraw

the
holder
and
brushes
as
shown
in
Fig
M
17

Slacken
and
remove
the
three

through
bolts
and

separate

the
diode

housing
from
the
drive
end
housing
by
tapping
the

front
bracket

lightly
with
a
wooden
mallet

Fig
M
18

Remove
the
screws
from
the

bearing
retainer
and

separate
the

rotor
from
the
front
cover

Fig
M
19

Remove
the
rear

bearing
from
the
rotor

assembly
with
the

aid
of
a

puller
as
shown
in

Fig
M
2D
Take
off
the
diode
cover

and
unsolder
the
three
stator
coil
lead
wires

from
the
diode

terminal

Remove
the

A
terminal
nut
and
diode
installation
nut
and

remove
the
diode

assembly
Do
not
force

the
diode

assembly

when

removing
or
it

may
be

damaged
Remove
the
stator
from

the
rear
cover

ALTERNATOR

Inspection

Use
an

ohmmeter
as

shown
in
Fig
M
21
to
test

the
rotor

field
coil

Apply
the
tester
between
the

slip
rings
and
check
that

the
resistance
is

approximately
4
4
ohms
at

normal
ambient

temperature
Check
the

conductivity
between

slip
ring
and
rotor

core
as
shown
in

Fig
M
22
if

conductivity
exists
the
field
coil

or

slip
ring
must
be

earthing
and
the
rotor

assembly
should
be

renewed

Cbeck
the
stator
to
ensure
that
there
is

conductivity

retween
the
individual
stator

coil
terminals
as
shown
in

Fig
M

23
If
there
is
no

conductivity
between
the
individual
terminals

the
stator
is
defective

Check
each
lead
wire

including
the
neutral
wire
as
shown

in

Fig
M
24
If
there
is

conductivity
between

any
wire
and
the

stator
COTe

the
stator
core

is

earthing
and
the
stator
must

be

replaced

Diodes

Three

positive
diodes
are
mounted
on
the
positive
plate

and
three

negative
diodes
are
mounted
on
the

negative
plate

The
diodes
allow

current
to
flow
in
one
direction

only
The

diodes
on
the

positive
plate
only
allow
current
to
flow
from

the
terminal
to
the

positive
plate
whilst
the
diodes
on
the

negative
plate
only
allow
current
to
flow
from
the

negative

plate
to
the
terminal
A
diode
which
allows
current
to
flow

in
ooth
directions
or
does
not

allow
current
to
flow
in
the

correct
direction
is
unserviceable
and
all
six
diodes
must
be

replaced
Use
a
tester
as
shown
in
Figs
M
25
and
M26
to
check

each
diode

Brushes

Check
the
movement
of
the
brushes
in
their
holders
The

brushes
should
move

freely
and
can
be
eased
in
necessary
by

carefully
ming
the
sides
Oean
the
brush
holders
before

replacing

the
brushes
Renew
the
brushes
if

they
are
worn
below
a
length

of
7mm
0
275
in
With
the
brush

projecting
approximately

2mm
0
08
in
from
the
holder
it
is
possible
to
measure
the

brush

spring
pressure
using
a

spring
balance
as
shown
in

Fig
M
27

The

pressure
of
a
new
brush
should
be
255
345

grammes

9
0
12
2
oz
the

pressure
will
however
decrease

by
approxi

mately
20

grammes
per
I
amm
0
039

in
of
wear

ALTERNATOR

Assembly
and
Installation

Asssembly
is
a
reversal
of
the

dismantling
prQcedure
noting

the

following
points
The
stator
coil
lead
wires
must
be
resoldered
to
the
diode

assembly
terminal
as

quickly
as

possible
or

the
diodes

may
be

damaged
When

installing
the
diode
A
tenninal
make
sure

that

the

insulating
bushing
and
tube
are

correctly
fitted

The

pulley
nut
should
he

tightened
to
a

torque
reading
of

350
400

kg
cm
301
344Ib
in
Mount
the

assembly
in
a

vice
as
shown
in

Fig
M
28
and
when
the

pulley
is

tightened

make
sure
that
the
deflection
of
the

pulley
groove
does
not

exceed
O
3mm
m
o
118

in

ilEA
D
LAMPS

Replacing

All
weather

type
sealed
beam

headlamp
units
are
fitted
to

the
vehicle
Each

lamp
is
of
the
double
fIlament

type
with
a

full
beam
filament
of
50W
and
a
dipped
beam
filament
of
40W

The

replacement
of
the
sealed
beam
unit
can

be
carried

out
as
follows

Remove
the

wiring
socket
from
the
back
of
the

headlamp

unit
On

Coupe
models
withdraw
the
screws

attaching
the

front

grille
to
the
radiator
core

support
On
all
other
models

remove

the
three

retaining
screws
and
remove
the

headlamp
rim

Withdraw
the
three

retaining
screws

securing
the

retaining

ring
3
in

Fig
M
29
and
remove

the
sealed
beam
unit

When

installing
a
new
sealed
beam
unit
make
sure
that
the

Top
mark
on
the
ring
is

uppennost
when
fitted

HORNS

The
circuit
for

the
horns
is
shown
in

Fig
M
30
The
horns

can
be
adusted
for
v01ume
and
tone
in

the

following
manner

Remove
the
connector

and
the

retaining
nut
in

the
centre

of
the
horn
withdraw
the
horn
from
the
vehicle
Connect
a

voltmeter
and
ammeter

into
circuit
as
shown
in

Fig
M
3I
Set

the
switch
to
ON
and
check
that
the
voltmeter
shows
a

reading
of
12
to
12
5
volts
The
sound
can
be

regulated
by

turning
the

adjusting
screw

Fig
M
32
A

reading
of

2
5

amps

should
be
obtained
for
the
flat

type
of
horns
or
5
0

amps
for

the

spiral
type
of
horns

Turning
the

adjusting
screw
clockwise
will
increase
the

current

turning
anti
clockwise
decreases
the
current

Install
the
horns
in
the
vehicle
and
check
that
the
correct

sound
can
still
be
obtained
when
the

higher
voltage
of
14
15

volts
is

generated
by
the
alternator
Turn
the

adjusting
slightly

if

necessary
then

tighten
the
locknut

INSTRUMENT
PANEL
Removal

The
instrument

panel
holds
the
various
meters

and

indicators
A
printed
circuit
board
is
located
at
the
rear
of
the

panel
and
the
connections
to
it
are

multiple
connectors
When

the

panel
is
remove

the
instruments
are

easily
withdrawn
for

inspection
and

servicing

Disconnect
the

battery
negative
terminal

2
Remove
the
windscreen

wiper
switch

lighting
switch
and

choke
control
knobs

by
pressing
them
in
and

turning

anticlockwise
Remove
the
escutcheon

3
Disconnect
the

cigarette
lighter
cable
at
the
rear
of
the

instrument

panel
and
turn

the

cigarette
lighter
outer
case

so
that
it
can
be
removed

115

4
Remove
the
shell
covers

from
the

steering
column
slacken

the

screws
securing
the
meter

housing
and
withdraw
the

panel
from
the
facia

Fig
M
33

5
Pull

out
the
12

pole
round

shaped
connector
and
remove

the

speedometer
cable
union

nut
then
remove
the
instru

ment

panel
completely

WINDSCREEN
WIPERS

A
two

speed
wiper
motor
is
fitted

The
motor
has
an
auto

stop
mechanism
and
drives
the

wiper
arms

through
a
link

mechanism
located
behind
the
instrument
panel
If
the

wiper

system
does
not

operate
check
the
fuses
connectors
control

switch
and
motor
If
the

wiper
speed
does
not

change
the

switch
must

be
repaired
or

replaced
If

the

wiper
motor
becomes

unserviceable
it
can
be
removed
from
the
vehicle
in
the

fOllowing

manner

I
Remove
the
connector

plug
from

the
motor
See

Fig
M

34

2

Working
from
the

passenger
compartment
side
of
the
dash

panel
remove
the
nut

connecting
the

wiper
motor
worm

wheel
shaft
to
the

connecting
rod

3
Remove
the
three
bolts

securing
the

wiper
motor
to

the

cowl
and
lift
out
the
motor

Battery

Starter
motor

Type

Output

No
load

Terminal

voltage

Current

Revolution

Load

Terminal

voltage

Current

Torque

Brushes

Brush

length

Wear
limit

Spring
tension

Commutator

Standard
outer

diameter

Wear
limit

Depth
of

nuca

Repair
limit

Repair
accuracy

Qearance
between
armature

shaft
and

bushing

Repair
liinit

Repair
accuracy

Armature
shaft
ou
ter

diameter

Pinion
side

Rear
end

Wear
limit

Bend
limit
The

wiper
arms
can
be
removed
quite
easily
by
taking
off

the
attachment
bolt
as
shown
in

Fig
M

J
5
and
then

pullin

the

wiper
arm
from
the

pivot
shaft
When

installing
the

wiper

arm
make
sure
that
the
blade
is

positioned
approximately

27mm
1
06
in
away
from
the

bottom
of
the
windscreen
and

tighten
the

wiper
arm
attachment
bolt

WINDSCREEN
WASHERS

The
windscreen
washer
SWItch
and

wiper
switch
are
com

bined
in
a

single
unit
See

Fig
M
36
the
washers
can
be

operated
by
turning
the
switch
in
the

appropriate
direction
It

should
be
pointed
out
that
it
is
inadvisable
to

operate
the
washers

for
more
than
30
seconds
at
a
time
If
the
washers
are

operated

in
short

spells
of

approximately
10
seconds
duration
their

working
efficiency
will
remain

unimpaired
for
a
considerable

length
of
time

IGNITION
SWITCH
AND
STEERING
LOCK

The

steering
lock
is
built
in

to
the

goition
switch
When

the

key
is
turned
to
the
LOCK

position
and

then
removed

the
steering
system
is

automatically
locked

by
the

steering
lock

spindle
which

engages
in
a
notch
in
the
collar
on
the

steering

shaft

See

Fig
M
37
The
heads
of

the
screws
are
sheared
off

on
installation
so
that
the

steering
lock

system
cannot
be

tampered
with
If

the

steering
lock
is
to

be

replaced
it
will
be

necessary
to
remove
the
two

securing
screws
8
and
then
drill

out

the
self

shearing
screws
7
When

installing
a
new

steering

lock

tighten
the
new
self

shearing
screws
until
the
heads
shear

TechnICal
Data

12
volt

HITACHI
S114
87M

1
0KW

12
volts

Less
than
60

amperes

More

than
7000
r

p
m

6
3

volts

Less
than
420

amperes

More
than
0
9

mkg
6
5
lb

ft

16
mm

0
630
in

6
5mm
0
256
in

0
8

kg
1
8
lb

33mm
1
299
in

2mm

0
078
in

0
2mm
0
008
in

0
5
0
8mm
0
0197

0
0315
in

0
2mm
0
008

in

0
03
O
lmm
0
0012

0
0039
in

13mm
0
512
in

11
5
mm

0
453
in

O
lmm
0
0039

in

0
08

mm
0
0031

in
Oearance
between

pinion
and

stopper
0
3
1
5mm
0
0118

0
0591
in

ALTERNATOR

Type
HITACHI
LTl25
06

HITACHI
LTl33
05
USA

Canada

More
than
18

amps
at

14

volts
2500
r

p
m

More
than
25

amps
at

14

volts
5000
r

p
m
Output
current

LTl25
06

Output
current

LT
133
05

More
than
24

amps
at

14

volts
2500
r

p
m

More
than
33

amps
at
14

volts
5000
r

p
m

Brushes

Lengtb

Wear
limit

Spring
pressure
14
5mm
0
571
In

7mm
0
2756
in

0
25
0
35

kg
0
55
0
771b

Slip
ring

Outer
diameter

Reduction
limit

Repair
limit

Repair
accuracy
31
mm
1
220
in

I
mm

0
039

in

O
3mm
0
0118
in

0
05
mm

0
0197
in

VOLTAGE
REGULATOR

Type

Regulating

voltage
HITACHI
TL
lZ
37

14
3
15
3
volts
at
200C
680F

117

N
Engme
SYMPTOMS
I

Trouble
Shooting
Lubrication
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ENGINE
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ENGINE
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BUT
OOES
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ENGINE
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BUT
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FOR
SHORT

PERIODS
aNL
Y

ENGINE
I
tISFIRES
AT
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ENGINE
MISFIRES
AT
HIGH
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ENGINE
MISFIRES
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ENGINE
MISFIRES
ON
ACCELERATION

AND
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ROUGH
IDLE

RUNS
ROUGH
AT
HIGH
SPEED

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EXCESSIVE
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Ignition
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SYMnONS
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UCK
OF
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GIS

DESCRIYfION

ENGINE
Removal
and
Installation

ENGINE
MOUNTING

INSULATORS

ENGINE

Dismantling
Inspection
and
Overhaul

CHAMSHAFT

AND
CAMSHAFT
BEARINGS

CYLINDER
BLOCK

PISTONS

CONNECTING

RODS

CRANKSHAFT

ENGINE

Assembling

VALVE
CLEARANCE

Adjusting

DESCRIYfION

The
G
18

engine
is
a
short

stroke
unit
with
a

displacement

of
1
815
ce
The
aluminium

alloy
cylinder
head
has
cross
flow

ports
and
a
V

shaped
valve

layout
The

single
overhead
camshaft

is
driven
from
the
crankshaft

by
a
double
row
roller
chain
at
a

reduction

ratio
of
2
I

The
crankshaft
is
a

carbon
steel

forging
and
is

provided

with
five
main

bearings
and
four

balancing
weights
Aluminium

thrust

bearings
are
located
at

the
No
2

journal

The
cast
aluminium

alloy
pistons
have
two

comp
ression

rings
and
one
oil

ring
Gudgeon

pins
are

fully
floating
in
the

piston
bores
and
are

equipped
with

circlips
at

each
end
to
limit

the
amount

of
their
travel
The

forged
steel

connecting
rods

have
weight
adjusting
bosses
at
both

large
and
small
ends
to

insure
that
the
rods
are

correctly
balanced

during
operation

The

lubricating
system
is
of

the

pressure
feed

type
with

the
oil

pump
driven

by
a

gear
on
the
crankshaft
Oil
is
delivered

to
the
main

gallery
via
a
full
flow
ftlter

ENGINE
Removal
and
Installation

Although
the

engine
can
be
removed
as
a

single
unit
it

will

prove
an
easier

operation
to
remove

the

engine
with
the

transmission
Proceed
as
follows

Fit
the
engine
slingers
ST49760000
to
the

engine

Disconnect
the
battery
cables
and
lift
out

the

battery

Drain
the
coolant
and

engine
oil

2
Place

alignment
marks
on
the
bonnet
and

hinges
remove

the
bonnet
from
the
vehicle

3
Remove
the
blow

by
hose
from
the
rocker
cover
and
take

off
the
air
cleaner

4
Disconnect
the
accelerator

linkage
and
choke
cable
from

the
carburettor

S
Detach
the

upper
and
lower

radiator
hoses
remove
the

two
brackets
from
the
core

support
and
lift
the
radia
tor

away
from
the
vehicle
The

torque
convertor

oil

pipes
must

be
disconnected
from
the
oil
cooler
if
the
vehicle
is

equip

ped
with
automatic
transmission
Detach
the
fuel

pipe
if

fitted
from
the
engine
and

heater
hose

6
Disconnect
the
electrical

wires
from
the
alternator
thennal
EngIne

OIL
PUMP

OIL
PRESSURE
RELIEF
VALVE

OIL
FILTER

EMISSION
CONTROL
SYSTEM

IGNITION

TIMING
AND
IDLING
SPEED

Emission

control

system

EMISSION
CONTROL
SYSTEM
Maintenance

IGNITION
SYSTEM

IGNITION
TIMING

IGNITION
DISTRIBUTOR
Maintenance

SPARKING
PLUGS

transmitter
the

primary
side
of
the
distributor
oil

pressure

switch
starter

motor
and
reverse

light
switch

7

Remove
the
clutch
slave

cylinder
and
its
return

spring
from

the
transmission
as
described
in
the
section
CLUTCH

8
Disconnect
the
shift
rods
and
selector
rods
then
remove

the
cross
shaft

assembly
by
detaching
the
bracket
from

the
side
member
See
GEARBOX
section

9
Disconnect
the

speedometer
cable
and
detach
the
front

exhaust

pipe
from
the
exhaust
manifold

10
Disconnect
the

propeller
shaft
and

plug
the

gearbox
rear

extension
to

prevent
the
loss
of
oil

11
Jack

up
the

gearbox
slightly
and
remove
the
rear

engine

mounting
support
Take
out

the
bolts
which
secure
the

front

mounting
insulators
to
the
cross
member

12
Attach
chains
or
wire

rope
to
the

engine
Gradually
lower

the

jack
under
the

gearbox
and
carefully
lift
and
tilt
the

engine
and
gear
box
to
clear
the

compartment
Withdraw

the
unit

making
sure

that
it
does
not
foul
the
accessories

Installation
is
a
reversal
of
the
removal

procedure
RefIll

with
the
correct

quantities
of
oil
and
coolant
when
the

engine
is
installed

ENGINE
MOUNTING
INSULATORS

Replacing

The

front
and
rear

mounting
insulators
should
be
checked

with
the

engine
installed
to
make
sure
that
the
dimensions

conform
with
those

given
in

Figs
A
I
and
A
2

To
remove
the
front
insulator

proceed
as
follows

Position
a

jack
under
the
oil

sump
Make
sure
that
the

jack
is
clear
of
the
drain

plug
and
insert
a
wooden
block
between

the
jack
and

sump
to

prevent
the

sump
from

being
damaged

Remove
the
bolts

securing
the
insulator
to
the
front

suspension

member
and
the
nut

attaching
the
insulator
to
the

engine

mounting
bracket
Raise
the

jack
slightly
and
remove
the

insulator
To
remove
the
rear

mounting
insulator

proceed
as

follows

Position
a

jack
to
take
the

weight
of
the

gearbox
and
take

out

the
bolts

connecting
the
insulator
to

the
transmission
rear

extension

housing
Remove
the
bolts

attaching
the
cross
member

to

the
underside
of
the

body
and
withdraw
the
insulator

Installation

of
both
insulators

is
a
reversal
of
the

removal

procedures

S3

ENGINE

Dismantling

Remove

the

engine
from
the
vehicle
as

previously
described

and

carefully
clean
the
exterior

surfaces
The
alternator

distribu

tor

and
starter
motor
should
be
removed
before

washing
Plug

the
carhurettor

air
horn
to

prevent
the

ingress
of

foreign
matter

Place
the

engine
and
transmission
on

the
engine
carrier
ST4797

0000
if

available
and
dismantle
as
follows

Remove
the

gearbox
from
the

engine
Disconnect
the
intake

manifold

water
hose
the
vacuum

hose
and
the
intake
manifold

to
oil

separator
hose
Remove
the
intake
manifold
with
the

carburettor
Fit
the

engine
attachment
ST3720OG18
to
the

cylin

der
block
and

place
tre

engine
on
the
stand
ST371
00000

Remove
the
clutch

@
Ssembly
as
described
in
the
section

CLUTCH
Remove
the
exhaust
manifold
and
heat
baffle

plate

Take
off
the
fan
blades
and
remove
the
water

pump
pulley
and

fan
belt
Remove
the
rocker
cover
hose
manifold
heat
hose
and

by
pass
hoses

Remove
the

generator
bracket
and
the
oil
fIlter
Extract
the

engine
breather

assembly
from
above
Note
that
the
breather

is
fitted
to
the

guide
and
is
installed
with
a
O

ring
which
is

pressed
into
the

cylinder
block

Flatten
the
10ckwasher
and
unscrew
the
crankshaft
pulley

nut
Withdraw
the

pulley
with
the

puller
ST44820000
if
available

but
do
not
hook
it
in
the
V

groove
of
the

pulley

Remove
the
rocker
cover
and
take
off
the
rubber

plug

located
on
the
front
of
the
cylinder
head

Straighten
the
lock

ing
washer
and
remove
the
bolt

securing
the

distributor
drive

gear
and
camshaft

sprocket
to
the
camshaft
Remove
the
drive

gear
and
take
off
the

sprocket
See

Fig
A
3

Remove
the

cylinder
head
bolts
in
reverse

order
to
the

tightening

sequence
sOOwn
in

Fig
A
18
and
lift
off
the

cylinder

head
as
an

assembly
See

Fig
A
4
Note

that
in
addition
to
the

ten

cylinder
head
bolts
there
are
also
two
bolts

securing
the

chain
cover
to

the
head
Invert
the

engine
and
remove
the
oil

sump
Remove
the
chain
cover
and
oil

flinger
Take
off
the
nut

securing
the
oil

pump
sprocket
and
withdraw
the

sprocket
with

the
chain
in

position
as
shown
in

Fig
A5
Remove
the
oil

pump

and
stramer
Note

that
two
of
the

pump
mounting
bolts
are

pipe
guides

Remove
the

timing
chain
crankshaft

sprocket
chain
ten

sioner
and
chain

stop

Remove
the

connecting
rod

caps
and

push
the

piston
and

connecting
rod
assemblies

through
the
tops
of
the
bores

Keep

all

parts
in
order
so

they
can
be
assembled
in
their

original
posi

tions

Take

out
the

flywheel
retaining
bolts
and
withdraw
the

flywheel
Remove
the
main

bearing

caps
but
take
care
not
to

damage
the

pipe
guides
Lift
out

the
crankshaft
and
main
bear

ings
noting
that
the

bearings
must
be
reassembled
in
their

original

positions
Remove
the

piston
rings
with
a
suitable

expander
and

take
off
the

gudgeon
pin
clips
The

piston
should
be
heated
to

a

temperature
of
50
to
600
122
to
1400F
before

extracting

the

gudgeon
pin
Keep
the
dismantled

parts
in
order
so

they

can
be
reassembled
in
their

original
positions

Remove
the
camshaft
rocker
ann
shaft
and
rocker
ann

assemblies
from
the

head

by
taking
off
the
cam

bracket

clamp

ing
nuts
It
is
advisable
to
insert
disused
bolts
in
the
No
1

and

No
5
bracket
holes
as
the
cam
bracket
will
fall
from
the
rocker

ann
shaft
when

it
is
removed
Remove

the
valve

cotters

using

the

special
tool
ST47450000

and
dismantle
the
valve
assemblies
Keep
the

parts
together
so

they
can
be
installed
in
their

original

order

ENGINE

Inspection
and
Overhaul

Cylinder
head
and
valves

Inspection
and
overhaul

procedures
can

be
carried
out

by

following
the
instructions

previously
given
for
the
L14
LI6

and
LIB

engines
noting
the

following
points

Measure
the

joint
face
of
the

cylinder
head

using
a

straight

edge
and
feeler

gauge
The

permissible
amount
of
distortion
is

0
03
mm
0
0012
in
or
less
The
surface
of
the
head
must
be

reground
if
the
maximum
limit
of
0

1
mm

0
0039
in
is

exceeded

Oean
each
valve

by
washing
in
petrol
then

carefully
examine

the
stems
and
heads
Discard

any
valves
with
worn

or

damaged

stems
Use
a

micrometer
to
check
the
diameter
of
the
stems

which
should
be
8
0
mm
0
315
in
for
both
intake
and
exhaust

valves
If

the
seating
face
of
the
valve
is

excessively
burned

damaged
or
distorted
the
valve
must
be
discarded
The
valve

seating
face
and
valve

tip
can
be
refaced
if

necessary
but

only

the
minimum
amount
of
metal
should
be
removed
Check
the

free

length
and
tension
of
each
valve

spring
and

compare
the

figures
obtained
with
those

given
in
Technical
Data
at
the
end

of
this
section
Use
a

square
to
check
the

springs
for
deformation

and

replace
any
spring
with
a
deflection
of
1
6
mm
0
0630
in

or
more

Valve

guides

Measure
the
clearance
between
the
valve

guide
and
valve

stern
The
stem
to

guide
clearance
should

be
0
025
0
055
mm

0
0010
0
0022
in
for
the
intake
valves
and
0
04
0
077
mm

0
0016
0
0030
in
for
the
exhaust
valves
The
maximum
clear

ance

limit
is
0
1
mm
0
0039
in
The
valve

guides
are
held
in

position
with
an
interference
fit
of
0
040
0
069
mm
0
0016

0
0027
in
and
can
be
removed

using
a

press
and
valve

guide

replacer
set
ST49730000
under
2
ton

pressure
This

operation

can

be
carried
out
at
room

temperature
but
will
be
more
effec

tively

performed
at
a

higher
temperature
Valve

guides
are

available
with
oversize
diameters
of
0
2
mm
0
0079
in
The

cylinder
head
guide
bore
must
be
reamed
out
at

normal
room

temperature
and
the
new

guides
pressed
in
after

heating
the

cylinder
head
to
a

temperature
of

approximately
800
C
1760F

The
standard
valve

guide
requires
a
bore
of
14
0
14
018
mm

0
551
0
552

in
and
the
oversize
valve

guide
a
bore
of
14
2

14
218
mm
0
559
0
560
in
Ream
out
the
bore
of
the

guides

to
obtain
the
desired
finish
and
clearance
Use
the
reamer
set

ST49710000
to

ream
the
bore
to
8
000
8
015
mm
0
3150

0
3156
in
The
valve
seat

surface
must

be
concentric
with
the

guide
bore
and
must
be
corrected
if

necessary
using
the
new

valve

guide
as
axis

Valve
seat
inserts

Check
the
valve
seat

inserts
for

signs
of

pitting
The

inserts

cannot
be

replaced
but

may
be
corrected
if

necessary
using
a

valve
seat
cutter

ST49720000

Scrape
the
seat

with
the
450

cutter
then

reduce
the
width
of
the

contacting
faces

using
the

150
and
600
cutters
for
the
intake
valve
inserts
and
150
cutter

for
the
exhaust
valve
inserts
Seat
correction
dimensions
are

shown
in
millimeters
in

Fig
A
6

Lap
each
valve
into
its
seat
after

correcting
the
seat
inserts

Place
a
small

quantity
of
fme

grinding
paste
on

the

seating
face

of
the
valve

and
lap
in
as

previously
described
for
the
Ll4
LI6

and
L
18

engines

S5

pulley
should
be

aligned
with
the
T
mark
on
the
chain
cover

Install

the
cylinder
head

assembly
Coat

the

cylinder
block

side
of
the
head

gasket
with

sealing
agent
Three
Bond
No
4

or

equivalent
but
take
care
that

the
scaling
agent
does
not

enter

the

cylinders

Tighten
the
head
bolts
in
several

stages
to
a

torque
reading

of
8

0
to
9

0

kgrn
58
to
65
lb

ft
Tighten
the
bolts
to
the

sequence
shown
in

Fig
A

IB

Pull
the

timing
chain
out
of
the
chain
cover
and
set
it
on

the
camshaft

sprocket
so
that
the

timing
marks
are

aligned
then

place
the

sprocket
and
chain
on

the
camshaft

Install
the
distributor
drive

gear
on
the
camshaft
and

tighten
the
bolt
to
a

torque
reading
of
4
5
to

5
5

kgrn
32
6
to

39
8
lb
ft
Note
that
the
camshaft
bolt
has
a
left
hand
thread

Adjust
the
valve
clearances
as
described
under
the

appro

priate
heading
Fit
the
rubber

plugs
at
the
front
and
rear
of
the

cylinder
head

taking
care
to

apply
sealing
agent
to
the
rear

plug

Install
the
chain

adjusting
screw
and

adjust
the
tension

of
the
chain
in

the

following
manner

Rotate
the
crankshaft
clockwise
to
establish
the
correct

chain
tension
screw
the

adjusting
screw

fully
home
then
back

it
off

by
half
a
turn

and
secure
with
the
locknut

Install
the
valve
rocker
cover
and
fit
the
water

pump
Note

that
one
of
the
water

pump
mounting
bolts
also
secures
the

generator
adjusting
arm

Install
the
bracket
and
alternator
water

pump
pulley
fan

blades
and
fan
belt

Tighten
the
fan
bolts
and
lock
each
pair

of
bolts

together
using
wire
inserted
through
the
holes

provided

in
the
bolts

Install
the
oil
filter
and
fit
the
rocker
cover
hose
Install

the
distributor
so
that
the
vacuum
control
unit

and
rotor

arc

positioned
as
shown
in

Fig
A
19

Oil
the
distributor
driven

gear
Fit
the
breather

assembly

the
clamp
of
the

pipe
is

tightened
together
with
the
exhaust

manifold
Install
the

spark
plugs
and
connect
the

high
tension

leads

Install
the
exhaust
manifold
Fit
the
head
shield

plate
and

engine
slinger
and

tighten
them

together
Note
that
the
exhaust

manifold

gasket
must
be
fitted
with
the
steel

plate
facing
the

manifold
Install
the
clutch
as
described
in
the
section
CLUTCH

Remove
the

engine
from
the

mounting
stand
and
install

the
gearbox
intake
manifold
and
carburettor
stater
motor

engine
mounting
oil

pressure
warning
switch
etc

Fill
the

engine
and

gearbox
to
the
correct
levels
with

recommended
oils
and
refill
the

cooling
system
Adjust
the

ignition

timing
and
carburettor

as
described
in
the

appropriate

sections

VALVE
CLEARANCES

Adjusting

The
valves
clearances
can

be
adjusted
in
a
similar
manner

to
the
instructions

given
for
the
L14
LI6
L18

engines

Initially
adjust
the
clearances
with
the

engine
switched
off
and

cold
to

0
2
mm
0
0079

in
for
both
intake
and
exhaust
valves

Set
the
final
clearances
to
0
28
mm
0
011
in
for
both
intake

and
exhaust
valves
with
the

engine
warmed
up
to
its
normal

operating
temperature
OIL
PUMP

The

gear
type
oil

pump
is

chain
driven
from
a

sprocket
on

the

crankshaft
The

pump
can

be
removed
in
the

following
manner

1
Remove

the

sump
plug
and
drain
the

engine
oil
Remove

the
distributor
as
described
in
the
section
IGNITION

2
Remove
the

cylinder
head

assembly
fan
belt
crankshaft

pulley
and

oil

sump

3
Take
off
the
chain
cover
with

oil
fl

inger

4
Remove
the
oil

pump
and
crankshaft

sprockets
with
the

drive
chain
then
withdraw
the

pump
after

removing
the

four

mounting
bolts

Separate
the
cover
from
the

body
by

unscrewing
the
four

securing
bolts
and
withdraw
the
drive
and
idler

gear

assemblies
Unscrew
the
threaded

plug
and

take
out

the

relief
valve
and

spring

Clean
the

parts
thoroughly
and

inspect
them
four

signs

of
wear
or

damage
Check

the

following
clearances

Gear
backlash
0

1
to

0
5
mm
0
0039
to

0
0195

in

Side
clearance
between

gear
and

body
0
016
to
0
15
mm
0
0006
to

0

0059
in

Clearance
between

drive
shaft
and

body
0
016
to
0
1
mm
0
0006
to

0
0039
in

Clearance
between

drive
shaft
and
cover
0
02
to
0
1
mm
0
00078
to

0
0039
in

Clearance
between

idler

gear
and
idler
shaft
0
016
to

0
1
mm
0

0006
to

0
0039
in

Assembly
is
a
reversal
of
the

dismantling
procedures
taking

care
to

position
the
gears
so

that
the
dotted
mark
is
towards
the

cover

Install
the

pump
and

adjust
the
tension
of
the
drive
chain

by
ph
otting
the
pump

body
as

shown
in
Fig
A
20

When
the

chain
is

correctly
tensioned
it
should
be

capable
of
a
deflection

of
2
0
to

3
0
mm

0
079
to

0
118
in
as

indicated

OIL
PRESSURE
RELIEF
VALVE

The

pressure
relief
valve
shown
in

Fig
A
21
is
not

adjustable

This
valve

regulates
the
oil

pressure
to
4
55
4
85

kg

sq
cm

64
7
69
0
lb

sq
in
and
when

opened
allows
the
oil
to

by
pass

through
a

passage
in
the

pump
body
and
return
to
the

sump

Check
the
free

length
of
the

spring
which
should
be
64
0

to
66
0
mm
2
51
to
2
60
in
The

compressed
length
should

be
50
mm
at

7
8
to

9
7

kg
1
96
in
at
17
2
to
21
4Ibs
Renew

the
spring
if

necessary

OIL
FILTER

The
oil
filter
is
of
the
full
flow

type
with
a

replaceable

element
and

incorporates
a

by
pass
valve
in
the
cover

Oil

leaks
can
be
corrected

by
replacing
the

body
centre

shaft
or
cover

gaskets
The

body
and
centre

shaft

gaskets
should

always
be
renewed
after

dismantling
the
filter

S
1

Renew
the
ruter
element
at

10
000
km
6000

miles
inter

vals

Dismantling
is
a

straight
forward

operation
Remove
the

plug
from
the
cover

and
withdraw
the
washer
spring
and

by
pass

valve
Check
the
free

length
and

compressed
length
of
the

by
pass

valve

spring
and
renew
if
necessary
The
free

length
of
the

spring

should
be
54
5
to
56
0
mm
2
14
to
2
20
in
and
the

compressed

length
49
0
mm
1
93
in

EMISSION
CONTROL
SYSTEM

Crankcase
and
exhaust

gas
emissions
are
controlled

by
two

systems
The
crankcase
emissions
by
a
Positive
Crankcase
Ventila

tion
System
and
the
exhaust
emissions

by
a
Nissan
Air

Injection

System
Brief

descriptions
of
the

systems
together
with
the
test

ing
and

servicing
procedures
are

given
below

Positive
Crankcase
Ventilation

System

lbis

system
returns
the
blow

by
gases
to
the
intake
mani

fold
and
the
carburettor
air
cleaner
see

Fig
A
22
Under

part

throttle
conditions
the
intake
manifold
draws
the

gases
through

a
variable
orifice
valve
Control
valve
into
the
combustion

chambers

Ventilating
air
is
then
drawn
from
the
carburettor

air
cleaner
and

passes
throy
gh
a
tube
in
to
the
crankcase

With
the
throttle

fully
open
the
manifold
vacuum
is
insuf

ficient
to
draw
the

gases
through
the
valve
Under
these
conditions

the

gases
flow

tluough
the
tube
to
the
air
cleaner
in
the
reverse

direction
The

gases
are
therefore
retained
or
burnt
to
lessen

the
risk
of
air

pollution

Servicing
and
testing

Once
a

year
or

every
20
000
km
12
000
miles
the
Posi

tive
Crankcase
Ventilation
System
should
be
serviced
as
follows

Check
all
hoses
and
connectors
for

signs
or

leakage
Discon

nect

the
hoses
and
blow

through
them
with

compressed
air
to

make
sure

they
are
not
blocked
Fit
a
new
hose
if
air
cannot

be
forced
through

Check
the
ventilation
control
valve
for

servicability
and

renew
it
if
defective
To
test
the
valve
run

the
engine
at

idling

speed
see
under
IGNITION
TIMING
AND
IDLING
SPEED

and
disconnect
the
ventilation
hose
from
the
rocker
cover
If

the
valve
is

working
correctly
a

hissing
noise
will
be
heard
as

air

passes
through
the
valve
and
a

strong
vacuum
should
be
felt

immediately
a

fInger
is

placed
over
the
valve
inlet
The
valve

cannot
be
serviced
and
must
be
renewed
if

unsatisfactory

Exhaust
emission
control

system

The
Nissan
Air

Injection
System
comprises
an
air
cleaner

belt
driven
air
injection

pump
check
valve
anti
backfIre
valve

and
the
related

connecting
tubes
and
hoses
The
sealed

pump
is

driven

by
the

engine
and

injects
clean
mtered
air
into
the
exhaust

port
of
each

cylinder
The
clean
air
combines
with
unbumt

gases

as

they
are

expelled
into
the
exhaust
manifolds
and
reduces
the

emissions
to
below
the

permissible
level

required
by
air

pollution

laws

A
modified
carburettor
and
distributor
is
fitted
with
this

type
of

system
The
air

injection
system
is
shown
in

Fig
A
23

The
anti
backfrre

valve
is
controlled

by
intake
manifoLd

vacuum
and
is
fitted
to

prevent
the
exhaust

system
from
back

fIring
during
deceleration
When
decelerating
the
mixture
in

the
intake
manifold
is
too
rich
to
bum
and

ignites
as
it
combines

with
air

injected
by
the

pump
The
valve
shuts
off

the
air
delivered

SI2
to
the
exhaust

system
during
the

flrstpredetennined
period

of

dCl
cleration
and

prevents
back

firing
from

occuring

To

check
valve
is
located

between
the
air

pump
and
air

injection
nozzle
and
is
fitted
to

prevent
a
backflow
of
exhaust

gases
from

entering
the

system
The
valve
doses
when
the

exhaust
manifold

pressure
exceeds
air

injection

pressure
as
It

will

at
high
speed
or
if
the

pump
drive
belt
fails

A
relief
valve
is
mounted
in
the

discharge
cavity
of
the
air

pump
and
is

incorporated
to

hold
the
exhaust

gas
temperatures

to
a
minimum
to
minimize

any
loss
of

power
caused

by
the
air

injection

system
and
to

protect
the

pump
from
excessive
back

pressures

Testing

The

following
tests
should

be
carried
out
to
make
sure
that

the
exhaust
emission
control

system
is

operating
correctly
The

engine
must

be
at
normal

operating

temperature
to

perfonn
the

tests
Before
the

system
can
be
tested
the

engine
itself
must
be

checked
to

ensure
that
It
is
functioning
correctly
Disconnect

the
ant
backflTe
valve

sensing
hose
and
insert
a

plug
into
the

hose
to
close
the

passage
to
the
intake
manifold
Make
sure
that

the

engine
operates
normally
and
then

reconnect
the

parts

Testing
the
check
valve

Run
the

engine
until
it
reaches
its
nonnal

operating
tem

pemture
and
check
all
hoses
and
connectors
for

signs
of
leakage

Disconnect
the
air

supply
hose
from
the
check
valve
and

check
the
position
of
the

plate
inside
the
valve
body
The

plate

should
be

lightly
positioned
against
the
valve
seat
and
away
from

the
air
distributor
manifold
Insert
a
suitable
probe
into
the

valve
and

depress
the

plate
When
released
the

plate
should

return

freely
to
its

position
against
the
valve
seat

Leave
the
hose
disconnected
and
start

the

engine
Slowly

increase
the

engine
speed
to
1500
r

p
m
and
examine
the
valve

to

make
sure
that
the
exhaust

gases
are
not

leaking
The
valve

may
flutter
or
vibrate
at

idling
speed
but
this
is

quite
nonnal

Renew
the
valve
if

necessary

Testing
the
ant

backftre
valve

Run
the

engine
until
it
reaches
its

normal
operating
tem

perature
Check
the
hoses
and
connections
for

signs
of

leakage

Rectify
any
leakage
before

testing
the
vaNe

Accelerate
the
engine
in
neutral
and
allow
the
throttle

to
close

quickly
The
valve
is

operating
correctly
if
the
exhaust

system
does
not
backfire

Further
test
can
be
made
with
the

by

pass
hose
to
the
air

pump
suction
line
disconnected
from
the

valve

Open
and
close
the
throttle
valve
rapidly
Hold
a

fInger

over
the
valve
outlet
and
check
that
air
flows
for
between
a

half
and
one
second
If
air
does
not

flow
or

alternatively
if
it

flows

continuously
for
more

than
two
seconds
the
valve
is

faulty
and
must
be
renewed

Disconnect
the
vacuum

sensing
hose
from
the
valve
Insert

a

suitable

plug
securely
into
the

hose
The
valve
is
not

functioning

correctly
if
the

idling
speed
now
differs

excessively
from
the

speed
at

which
the

engine
operated
with
the
hose
connected

Testing
the
air

pump

Special
tools
are

required
to
test
the
air

pump
The
vehicle

should
therefore
be
taken
to
an

Approved
Agent
capable
of