DATSUN 510 1968 Service Workshop Manual

46

CHAPTER

SIX

CAUTION

When

removing
camshaft
use
ex

treme
care
not

to
scratch

the
cam

bushings
Be
certam
to

leave
the
cam

shaft

bushings
Intact
so
as

not
to

get

them
out

of
al

gnment

3

Remove
camshaft
from
the

cylmder
head

by

carefully
pullmg
It

out
of

the
camshaft

beanng

housmgs
as
shown

m

Figure
32

@

4
Use
a
valve

hfter
as
shown
in

Figure
33

to

compress
the
valve

spnngs
so
that
the

valve

collects

located
at
the

tops
of
the
valve

stems

can

be
wIthdrawn
Once
the

collets
are

out
all

parts
of
the
valve

mechamsm
can
be
removed

from
the

cylmder
head

@

The
valves
are
removed

by

pullmg
them
out

the

bottom
SIde
of
the

cylinder
head

IdentIfy

each

upon
removal
to

permit
remstallation
in

the
same

posItion

Figure
34
Illustrates

the
var
@

o

o

IOUS

components
of
the
camshaft
and

valve

assembly

ENGINE

INSPECTION
AND

REPAIR

Once
the

engme
has

been

dIsassembled
clean

and

mspect
all

parts
to
determme
theIr
condi

tIon

CntIcal
dunenslOns
are
hsted
in
each

sec

tion
below

Cylinder
Head

CAUTION

Use
care
when

handling
the

cylinder

head

to
make
certam

that
the

cam

shaft

beanngs
are

not
removed

or

dIsplaced

1
Clean
all

foreign
matenal
from
the

cylmder

head

Pay

partIcular
attentIon
to

removal
of
car

bon
from

the
combustIon
chambers

Scrape
off

as
much
as

pOSSIble
and
remove
the
rest
with
a

wire

wheel
on
an
electric

dn11

2
Measure
the
machIned

surface
of
the
head

for

warpmg
FIgUre
35
covers
the

procedure
Use

a

StraIght
edge
and
feeler

gauge
Maxunum

@

ENGINE
47

allowable

warpage
IS
0
0039
in
0
I
mm

Standard
should
be
less
than
0
0012
in

O
03mm
In
the
event
the
measurements
are

out
of
tolerance
the

cylmder
head
surface

should
be
milled

or
resurfaced

3

Verify
that
all
water
and
011

passages
are
free

of

foreign
matena

Use

compressed
aIr
to
clean

passages
after

scraping

4
Note
the
condition
of
all
studs
in
the

cylinder

head

Replace
damaged
ones

Valve

Assembly

I
Check
intake
and
exhaust
valve
assembhes

for
worn

damaged
or
deformed
valve

caps
and

stems
Correct
or

replace
the
valve
If
excessive

defects
exist

2
Measure
valve
stem
diameter
WIth
a
micro

meter
as
shown
in

Fignre
36

Figure
37

gives

cnncal
drmensions

@

@

Y

lm

1

0
515

r

3
Reface
the
valve
face
and
valve
stem

using
a

valve

grinder
as
18
shown
in

Fignre
38
NOTE

When
the
valve
head

1uzs

been
reduced
to
00197
in
0
Smm

or
less
In
thIckness

replace
the
valve

Grinding
allowance

for
the
valve
stem

end

surface
is
00197
In
0
Smm
or

less

4
Measure
the
free

length
and
tension
of
each

valve

spring
If
the
measured
values
exceed
the

hnuts

specified
below

replace
the

spring

SPRING
SPECIFICATIONS

Free
Length
Outel

Spring

Inner

Spring

Outer

Spring
2
0472
10

52
Omm

1
765710
44
85mm

153m
at6393
331Ib

389mm
at290

15kg

138m
at
2712
154lb

35mm
at12
3
0
7

kg

121
10
at
105
38
5
29
Ib

30
7mm
at
47
8
2
4
kg

09610
at5621
2871b

245mm
at

25
5
13

kg
Valve
Closed

I
nner

Spring

Outer

Spnng

Valve

Open

Inner
Spnng

5
Check
the

deformation
of
each

spnng
with
a

square
Replace
any
spnng
WIth
a
deflection
of

o
063
in
I

611lID
or
more

6
Check
all

workmg
surfaces
of
the
rocker
arms

for

damage
or
wear
If
defects

or

apparent
ex

cessIve
wear

are
found

replace
them
A
defective

PIvot
reqwres
It
S

replacement
along
WIth
the

correspondIng
rocker
ann

7
Measure
the
clearance
between
the

valve

gwde
and
the
valve
stem
If
the
clearance
ex

ceeds
hnuts

replace
the
worn

parts
or
both

48
CHAPTER

SIX

valves
and
valve

guIdes
Figure
39
hsts

specifica

tions
for
the
valve

gwdes
PreCIse
measurement

reqwres
a
nncrometer
and
a

telescopIC
hole

gauge
Insert
the
hole

gauge
mto
the
valve

gwde

hole
and
take
measurements
at
three

places
top

u

mm
OIA

CO
527
o
as

n

C

S

EXHAUST

3mm
0

0
111110
0
I

J
aDo

INTAKE
10

f
tl

T1
I
f

I

J
c

c

E

E

@
108

mm
Co
425
od

o
mm

2
32
ln

center
and
bottom
Subtract

hIghest
readmg
of

valve
stem
dIameter
from
valve
bore
measure

ment
to
obtain
clearance
It

should
not
exceed

0
0039
m
0
Imm
As
an
alternatIve
measure

a
valve
can
be
mserted
in
the
valve

guide
and

moved
from
SIde

to
SIde
If
the

tip
of
the
vaJ
ve

stem
deflects

by
more
than
0
0079
m
0
2mm

replace
It

8

Replacement
of
valve

gwdes
should
be
re

ferred
to
an
automotive
mac
rne

shop

9
After

replacement

anI
reannng
of
the
new

valve

guIde
the
valve
seat
surface
m
the

cylmder

head
should
be
refaced

by
usrng
the
new
valve

gwde
for

tool

placement

10
Check
the
valve
seat
inserts
for
evidence
of

plttmg
at
valve
contact
surfaces
Reseat
or
re

place
the
valve
seat
mserts

depending
on
the

overall
condItion
Oversize
valve
seat
inserts

are
available

Figure
40
shows
the

specificatIons

for

standard
sIZe
valve
seat
mserts

Replacement

IS
a
machme

shop
Job
Tolerances
are
listed
in

FIgure
40

Camshaft
and

ClIIll8haft
Bearings

1
Measure
the
inner
dIameter
of
the

camshaft

bearing
and
the
ouier
dIameter
of
the
camshaft

journal

2
Detenmne
the
actual
clearances
and
com

pare
them
to
the

specifications
followmg
Ll6
With

Single
Carb

@

Intake

Exhaust

Od
Clearance
Standard

00015
10
0
0026
10

00381010
0
0761010

1
8898
10

1
8904
rn

48
001010
48
0161010
Wear
Lrmll

o
0039
rn

011010

Camshaft

Beanng

Inner
Olameter

3
ExceSSIve
wear
in
the

camshaft

beanngs
re

quires
replacement
of
the

cyhnderl
head
as

sembly

4
Check
the
camshaft

camshaft

JOurnals
and

cam
surfaces
for

signs
of
bend
wear
or

scoring

Figure
41
shows
the
camshaft

being
checked
for

bend
Bend
values
are

expressed
in
terms
of
half

values
of
the

readmgs
obtamed
when
the
cam

shaft

15
rotated
one
full
turn
WIth

a
dial

gauge

applied
to
the
center

Journal

@

Camshaft
Bend
standard

o
0006
10

00151010
Bend
Lrmll

00020
rn

0
051010

ENGINE
49

Cylinder
Block

1
Check
the

cylmder
block
for
defects
such

as

cracks

leaky
soft

plugs
and

blocked
water

pass

ages
Blowout
all

passages
With

compressed
air

2
Measure
the
surface
of
the

cylinder
block

that
mates
with
the

cyhnder
head
for

warpage

Use
a

straight
edge
and
feeler

gauge
to
measure

clearance
as
shown

m

Figure
42
Surface
flat

ness
clearance
should
be
less
than
0
0020
m

0
05mm
Maxunum
allowable
is
0
0039
in

010mm
Resurface
the

cyhnder
block
if

beyond
hnnts

@

3
Use
a

bore

gauge
as
shown
m

Figure
43
to

measure
the
bore
of

each

cyhnder
Measure
near

the

top
at
the
center
and

near
the
bottom
If

excessive
wear

taper
or
out
of
round
exists

rebore
the

cyhnders
or

replace
the

cylinder

hners
Maxunum
wear
hnnt
of
a

cyhnder
bore
IS

o
0079
m
0

2mm
Standard
bore
IS
3
2677

0
0020
m
83
000
0
050mm
The
al

@
lowable
error
m
the

cyhnder
bore

taper
is

0
0006
in
0015mm
The
difference
between

the
four

cyhnder
bores
should
not
exceed
0
0020

in
0
05mm

NOTE
When

any
cylmder
needs
re

boring
all

foUT
must
be
rebored

4
If
the

cyhnder
bores
are
Wlthm
tolerances

use
a

ndge
reamer
to
remove
the

ndge
at
the

top
of
the

cyhnder
bores
and
then
hone
the

cyhnder
walls
to

complete
the

recolllhuonmg

Measure
the

cyhnder
bores
when

honmg
has

been
finished
to

venfy
that
allowable
tolerances

have
not
been
exceeded

Measuring
Bore

Below
is
a
method
for

checking
cntical
clear

ance
between

piston
and

cylinder
wall
Unless

you
are
familiar
With
such

work
call
m
an

expert
Clearance
should
be
between
0
0010
and

0
0018
m
0025

thrQugh
0
045mm

1
Insert
the

pISton
without

rings

upside
down

in
the

cyhnder
bore

2
Use
a
feeler

gauge
between
0
0010
and

00018
mches
thick

Insert
It
between
the

pISton

and
the

cylinder
wall
as
shown

m

Figure
and

attach
a

spring
gauge
as
illustrated

@

50

CHAPTER
SIX

3
Pull

up
on
the

spnng
scale
If
the

force
re

qurred
to

pull
the
feeler

gauge
out
IS
more
than

3
3

lbs
or
less
than
0
44
Ibs

the

piston
skirt

IS
either

too

large
or
small
for
the

cyhnder
and

must
be

replaced
With

a

pISton
of
the

proper
size

EIther
that

or
the

cyhnder
must
be

rebored
or

a
new

cyhnder
hner

mstalled

Piston

Piston
Pin
and
Piston

Ring

1

Inspect
all

parts
carefully
for

signs
of

clups

cracks
and

general
wear

2
Measure
the
side
clearance
oLeac

ring
in

It
S

appropnate
groove
as
shown
in

Figure
45

Clearances
should
be
witlun
the

following
tol

erances

Top
Ring
00018

through
00031
In

0045

through
0
078mm

00012

through
0
0025
In

0030

through
0063mm

00010

through
0
0025
In

0025

through
0063mm
Middle

Ring

011

Ring
bottom

@

3
Check
the

gap
of
each

nng
by
mserting
it

about
1
mch
down
the
bore

squanng
it

With
the

wall

by
tappmg
It
WIth

an
mverted

pIston
and

measunng
the

gap
between
the
two
ends
of
the

ring
Figure
46
In
the
event
the

cyhnders
are

not

being
rebored
measure
the

nng
gap
toward

the
bottom
of
the
bore

where
the

least
wear

has
occured

4

Ring

gap
should

be
as
follows
Top
Ring
00091

through
0
0150
In

0
23

through
o
38mm

o
0059

through
0
0118
In

0
15

through
0
30mm

o
0059

through
0
0118
In

0
15

through
0
30mm
Middle

Rmg

0
1

Rmg
bottom

@

fJ
t

1

v

5
Measure
the

pIston
pm
hole
on
both
SIdes
of

the

pIston
Measurement
should
be
between

08268
and
0
8271
m
21
001
and
21
008mm

6
Measure

pISton
pin
outsIde
dIameter
With

a

nucrometer
as
shown

m

Figure
47
The
mea

surement
should
be
between

0
8265
and
0
8267

in
20
993
and

20
998mm

7
Measure

pIston
pm
length
It
should
be

between

2
835
and
2
844
m
72
00
and

72
25mm

ENGINE
51

8

Figure
48
shows
the

pm
bemg
mserted
to

make
certam
that

It
can
be

pressed
m
at
room

temperature
by
hand
Piston

pm
clearance
to

piston
pm
should
be
between
0
0003
and
0
0004

m
0008
and
0
01Omm

NOTE
The

piston
pin
IS

fitted
to
the

connecting
rod
with
a

fitting
force
of

from
1
to
3
tons

of

pressure

Connecting
Rod

1

Inspect
all

connectmg
rods
for
flaws
or

obVIOUS

damage

2
Check
for

proper
alignment
as
shown

m

Fig

ure
49

RealIgn
as

necessary
ThIS
can
be
done

by
an
automotive
maclune

shop
Maxrmum

allowable
bend

m
the

connecting
rods
IS
0
0020

m
0
05mm

per
3
94

m
of

connecting
rod

length

@
3
Defects
m
the

piston
pm
hole

reqwre
replace

ment

of
the

connectmg
rod
Select
new
ones
so

that

weight
dIfference
between
new
and
old
IS

wlthm
0212
oz
6

gr

4
Install

beanngs
m
the
crankshaft
end
of
all

rods
Mount
the
rods
on
the
crankshaft
and

replace
beanngs
and
rod

caps
Install
bolts
and

tighten
Use
a
feeler

gauge
to
measure
end

play

between
the

connecting
rods
and
the
crankshaft

Figure
50
The
standard
measurement
should

be
between
00079
and
0
0118
m
02
and

0
3mm
Maximum
allowable
wear
IS
00118
m

0
3mm

Crankshaft

1
Check
the
crankshaft

journal
and
crank

pm

1
1

for
cracks
obVIOUS
wear
and
scratcheS

Repair

or

replace
defective

parts
I

2
Check
the
crankshaft
for
bend
If
the
bend

at
the
center

Journal
exceeds
0
0020

m

0
05mm
have
the
crankshaft

prOfeSSIOnally

straightened
or

replace
It

3
Check
crankshaft

Journals
and
crank

pms
for

out
of
round
and

taper
Figure
51
lIsts

speci

fications

Regnnd
the
crankshaft
1f
the

specIfica

tions
are
exceeded

by
more
than
00012

m

0
03mm

4

Replace
the

connecting
rod
and
mam
bear

mgs
With

proper
undersIZe

beanngs
If
the
crank

shaft
IS

reground
The

followmg
table

prOVides

data
for

beanng
replacement
based

on
the

final

sIZe
of
the
crankshaft

Journals
and
crank

pIllS

52

CHAPTER
SIX

@

1oI
DlA

IlIA

AU
Al

I
2
1I
a

1I
1
6
L

us

MAIN
BEARING
UNDERSIZE

Beanng
Beanng
top
Crank

Journal

sIZe

thickness

diameter

1
I000mm
mm
In

mm
In

STD
1
822
les5
54
942
54
955

0
0717
0
0722
2
1631
3
1636

25
1947
1960
54
692

54
705

Undersize
0
0767
0
0772

2
1532
2

1537

50
2072
2085

54
442
54
455

UndersIZe
00816

0
0821
2
1434
2
1439

75

2197
2
210
54
192
54
205

UndersIZe

0
0865
0
0870
2
1335
2
1341

100
2
322
2
335

53
942
53
955

UndersIZe
00914

0
0919

2
1237
2
1242

CONNECTING
ROD
BEARING

UNDERSIZE

Beanng
Beanng
top
Crank

pin

SIZe
thickness

diameter

l
loo0mm
mm
In

mm
In

STD
1493
1506
49961
49
974

0
0588
0
0593
1
9670
1
9675

6
1523
1536
49901

49
914

Undersize
0
0600
0
0605

1
9646
1
9651

12
1553
1566

49841
49
854

UndersIZe

00611
0
0617

1
9622
1
9628

25
1
618
1
631
49
711
49
724

UndersJZ8
0
0637
0
0642

1
9571
1
9576

50
1743
1756

49461
49
474

UndersIZe
00686

00691
1
9473
1
9478

75

1868
1881
49
211
49
224

UndelSlZ8
00735
0
0741
1
9374
1
9379

100
1993
2006
48
961

48
974

UndersIZe

0
0785
0
0790
1
9276
1
9281
5
Install
the
crankshaft
m
the

cylinder
block

and
measure
end

play
WIth
a
feeler

gauge
Figure

52
Allowable
IS
between
0
0020
and
0
0059
in

005
and
0
15mm

6

Replace
the
center
shIm
If
the
above

specified

value

IS
exceeded

by
0
0118

m
0
3mm

7
Check
the
main
dnve
shaft

puot
bearing
at

the

rear
of
the
crankshaft

for
wear
and

damage

Replace
It
If

any
defects
are
found

Main
and

Connecting
Rod

Bearings

1
Check
all

beanngs
for
seIZUres

meltIng
scor

mg
and
burrs

2
Measure
rod
and
main

bearings
clearances

WIth

PlastIgage
as
outhned

below

3
Insert
the

bearings
m
the

connecting
rod
rod

caps
main

beanng
caps
and
holders

4
Cut
a

pIece
of

PlastIgage
to
the
width
of
the

beanng
to
be
measured
and

place
It

m

parallel

with
the
crank

pm
as
shown
10

Figure
52
Make

certain
the

PlastIgage
does
not
cover
the
ou
hole

5
Install

bearings
and

caps
Main

bearings

should
be

tIghtened
to
32
5

through
398ft
lbs

45
to
55

kg
m
and

rod

beanngs
to
19
5

through
23
9
ft
lbs
2
7
to
3
3

kg
m

6
Remove
the

cap
and
measure
the
WIdth
of
the

PlastIgage
to
determine
clearance

7

Mam

beanng
readIngs
should
be
between

o
0008
and
0
0028
m
0
020
to
O
072mm
Rod

beanng
clearance
should
be
between
0
0006
and

0
0026
m
0014
to
0
066mm

8
To
check

beanng
crush
set
the

beanng
on

ENGINE
53

the
mam

beanng
cap
and
the

cyhnder
block

beanng
recess
and

tighten
the

cap
bolts
to
the

proper
torque
WIth
a

torque
wrench

Tig
temng

torque

Main

bearings
506
to
57
8
It
Ib

70to80kg
m

195
to
23
9
It
Ib

27
to3
3

kg
m
Rod

beanngs

9
Loosen
the

cap
bolt
on
one
Side
and
measure

the
clearance

Figure
53
between
the

cap
and

block
Side
Clearance
should
be
WIthm
the
fol

lowmg
specmcatIons
Mam

beanngs
0

through

o

0024
m
0
to
0
06mm
rod

beanngs
00012

through
0
0032
m
0
030
to
0
0024mm

Weight
@

10
If

beanng
crush
IS
not
m
tolerance

replace

the

beanngs

Crankshaft
and
Camshaft

Sprockets

1
Check
for

damaged
teeth

Replace
sprocket

1f

necessary

2
Install
the

camshaft

sprocket
and
check
for

runout
as
shown
m

Figure
54
If
over
0
04331

m
0
Imm

replace
the

sprocket
Check
for

thrust
deViation
at
the
same
tIme
Thrust
deVia

tIOn

should
be
between
0
0031
and
0
0150
m

008
to
0
38mm

3
Check
the
chain
for

damage
severe
wear

and
stretch
at
the
roller
hnks

Replace
the
cham

1f
defects
or
exceSSIve
stretch
IS
found

4
Check
the
cham
tenslOner
and
the
cham

gwdes
for
wear
and

damage

Flywheel

1
Check
the
clutch
disc
contact
surface
of
the

flywheel
for
wear
and

damage
@

2

Measure
deviation
of
the
clutch
disc
contact

surface

usmg
a
dial

gauge
If
deVIation
exceeds

004331
m
O
lmm

replace
the

flywheel

3
Check

flywheel
teeth
for

damage
Consult
a

dealer

Or
machIne

shop
1f
m
doubt

ENGINE
ASSEMBLY

This
section
covers

assembly
of
the

engme

after
corrective
mamtenance
has
been
com

pleted
SpecificatIons
and

torque
informatIon

are

given
at
the
end
of
the
sectIon
The

followmg

general
precautions
should
be
followed
m

assembhng
the

engme

1
Make
certam

all

parts
are

thoroughly
clean

and
that
all
011
and
water

passages
are
free
from

foreign
matenal

2
All

parts
that

slIde
mto
or

through
other

parts

should
be
coated
With
a
thm
film
of
new

engme

011
before

assembly

3
Don
t
reuse

gaskets
packIng
and
011
seals

Complete
lats
are
aVlUlable
for
the
entire

engme

and
for
the

cyhnder
head
and
block
assemblIes

4

Keep
tools
and
work
benches
clean
to
aVOid

contammatlon
of
delIcate

parts

5
Be

sure
to
follow

specmed
torque
tIghtenmg

values
and
order

of

tlghtenmg
where

given

6

Unless

complete
rebwld

of
the

engme
has

been
done
valves
and
associated

parts
bear

ings
pistons
and

connectIng
rods
should
be

remstalled
where

they
were
taken
from

CYLINDER

HEAD

Valve
and
Valve

Spring
Assembly

1
Insert
valve
from
bottom
of
block

54

CHAP1ER
SIX

2
Set
the
valve

spnng
seat

m

position
on
the

top
of
the
block
and

over
the

valve
stem

3
Place
the
oil
seal
over
the

valve
stem

4
Place
the

mner
and

outer
valve

spnngs
over

the
valve
stem

S

Place
the

spnng
retamer

over
the

springs

compress
spnngs
With

spring
compressor
Figure

55
and
mstall
valve
collets
around
valve
stem

so
that

they
lock
onto
stem

6
Release

spnng
compressor
If
collets
are
firm

ly
locked
onto
the

groove
m
the

valve
stem

assembly
IS

complete

7
Install
the
rocker

guIde
on

top
of
the

valve

stem
when

assemblmg
the
rocker

pivot
assembly

VaIve
Rocker
Pivot

Assembly

1
Thread
lock
nut
onto
valve
rocker

pivOt
and

place
rocker
retaIner
over
the
valve
rocker

pivOt

2
Thread
the
above

assembly
mto
the
rocker

bushIng
protrudIng
from
the

head

Camshaft

Assembly

1
Mount
the

locatIng
plate
on
the
front
of
the

head
as

shown
m

FJgIlI
1
56

2
From
the
back
of
the
head

carefully
InSert

the
camshaft

through
the

four
camshaft

beanngs

being
ca
efu1
not
to
move
or

damage
the
bear

ings

NOTE
Install
the

CQJ7IShaft

sprocket

onto
the

camshaft
so
that

the
three

locating
holes
are

at
the

top
left
and

bottom
h

1
3

Install
the

camshaft

sprocket
and
fuel

pump

cam
onto

the
front
of
the

camshaft
and

torque

to

specificatIon

4
Check
the
camshaft
for
end

play
using
a

feeler

gauge
as

preViously
described

Rocker
Pivot

Assembly

1
Push
down
on
valve

spnng
with
screwdriver

and
insert
rocker

piVOt
arm
between
camshaft

and
valve
stem

Insert
rocker
valve

guide
onto

top
of

valve
stem

at
this
time

2
Install
valve

rocker

springs
over

top
of
rocker

pivot
arm

Piston
and

Connecting
Rod

Assembly

1

Assemble
the
four

pistons

pms
and
connect

mg
rods
Secure

piston

pm
The

connecting
rod

IS

press
fitted
onto
the

pISton
pin
With
from
1
to

3
tons
of
force

NOTE
The

pistons
are

marked
with

an
F
which

should

point
toward
the

front
of
the

engine
The

connecting

rods

must
be
installed
so

that
the
011

Jet
In
the

large
end

IS

positioned
to

ward
the

right
Side

of
the

tnglne
The

center

of
the

piston
pin
IS

oD
set
In

relation
to
the

center

of
the

piston
so

correct

assembly
is
cntical

2
Use
a

nng
expander
to
install
the

rings
onto

the

pistons
Install
the

top
and
rmddle

nngs

with
the
marks

up

3

Lubncate
the

rod

bearings
hghtly
and
mstall

them
into

their

respective

connectIng
rods
and

rod

caps

ENGINE
55

Cylinder
Block

Assembly

1
PositIon
all
crankshaft

parts
on
a
work
bench

ThIS
mcludes
the
crankshaft
main

beanngs

rear
011

seal
woodruff

keys
crankshaft

gear

011

pump
gear
011
thrower
bolts
and

bearing

caps
Figure
57
shows
the

arrangement

@

2
Insert
maIO

beanngs
mto

appropnate
cy1m

der
block
holders

NOTE
The
center
No
3

beanng
IS

the

only
flanged
type
of
thrust
bear

Ing
Bearings
No
2
and
No
4
are

Identical
No
1
and
No
5

Jaring
ap

pear
identical
but
No
1
as
an
011

hole
All

bearings
except
No
1
are

Interchangeable
as
to

upper
and
lower

half

3

LIghtly
lubncate
the

crankshaft
and

beanng

matmg
surfaces
then
mstall

beanngs
10
mam

beanng
caps

4
Install
the
crankshaft

5
Install
mam

beanng
caps
over

crankshaft

msert
mam

cap
bolts
and

tighten
hghtly
The

mam

beanng
caps
have
an
arrow
marked
on

each
one
These
must

pomt
to
the
front
of
the

engme

6

Gently
move
the
crankshaft
10
an
aXIal
drrec

don

toward
the
front
of
the

engme
to

venfy
that

the
mam

beanng
caps
are

properly
alIgned
and

seated
7
Use
a

torque
wrench
to

tighten
the

cap
bolts

to
the
hmlts

speCIfied
The

t1ghtenmg
operatIon

should
be
done

gradually
10
three

or
four

sep

arate

stages
starting
10
the
center
and

workmg

outward

to
each
end

8
Rotate
the
crankshaft
to
make
certain
it
isn
t

bmding

9
Use
a
feeler

gauge
to
check
the
end

play
at

the
center

No
3

beanng
Figure
58

10
Install
the
SIde
oll
seals
into
the
rear
mam

cap
and

cy1mder
block
as
shown
10

Figure
59

@

11
Install
the
rear
011
seal
WIth
Datsun
tool

ST49370000
or

equIvalent

12
Install
the
rear
end

plate

13
Install
the

flywheel
WIth

proper
bolts
and

lock
washers
and

torque
as

specified