1973 DATSUN B110 check engine

ENGINE
MECHANICAL

5

M

co

El

co

I

ED

I

UNIT
mm

in

Fig
EM
49

Measuring
points

Outer
diameter
of

piston
skirt
measured
value

A

Piston
eylinder
clearance

B
0
023

to
0
043

mm
0

0009
to
0
0017
in

Boring
allowance
C
0
02

rom
0
0008
in

Cylinder
bore
to
be

machined

A
B
C
A

om
to
0
02
mm

0
0004
to
0

0008
in

4

Machine
the

cylinder
bore
to

the
determined
inner

diameter

Note
To

prevent
strain
due
to

cutting
heat

bore
in

order

of

2
4
3

or
cylinders
3
4
2

5
Do
not
intend
to
bore
in
one
time
but

cut
0
05
rom

0
0020
in

or
so
at

a
time

6
When

measuring
cylinder
bore

immediately
after

boring
note
that
the

cylinder
block
is

expanded
due
to

cutting
heat

7

Finish
the

treated

cylinder
bore
to
the

final
size

by

means
of

honing

8
Measure
the
finished

cylinder
bore
for
a

elliptic
or

tapered
part

9
Measure

clearance
between
the

piston
and

cylinder

This
clearance
can
be
checked

easily
by
using
a

feeler

gauge
and
a

spring
scale

EM
17
Feeler

gauge

0
03mm
0
0012
in

Pull
force

o
5to

5kg

11
to3
3
lb

i

Fig
EM
50

Piston
to

cylinder
clearance
check

Standard

clearance

rom
in
0
023

to
0
043

0
0009
to
0
0017

0

03
0
0012
Feeler

gauge
mm
in

Extracting
force

kg
Ib
0
5
to
1
5

1
1

to
3
3

Note
If
the

cylinder
bore
is
worn

beyond
the
wear
limit

use
the

cylinder
liner

Undersize

cylinder
liners

are
available
for
service

Interference
fit
of

cylinder
liner

Cylinder
block

0
8
to
0
9
mm
0

0315
to
0
0354
in

Cylinder
liner
for

service

400

undersize
Outside
diameter

mm
in

77
05
to

77
00

3

0330

to

3
0310

77
55

to
77
50

3

0530

to

3
0510

78
05

to
78
00

3
0730
to

3

0710
72
5

to
72
6

2

854

to
2
858
Inner
diameter

mm
in

72
5
to
72
6

2
854
to
2
858

450

undersize
72

5
to

72
6

2
854
to
2

858

500

undersize

ENGINE

PISTON
PISTON
PIN
AND

PISTON
RING

Check
for

seizure
scratch
and
wear

Replace
as

required

o

10

e

O

I
l

Fig
EM
51
Piston
and

connecting
rod

assembly

2
Measure
side
clearance
of
each

piston
ring
and

ring

groove
with

the

piston
ring
installed

on
the

piston

Clearance
of
a

new

piston
and

piston
ring
should
be

as

follows

EM129

Fig
EM
52
Side
clearance
measurement

EM
18
Side
clearance

Standard
Wear

limit

mm
in

mm
in

Top
ring
0
04
to
0
Q7

02
0
0079

0
00
5

to
0
0027

2nd

ring
0
04
to
0

07

0
0015
to
0
027
0
2
0
0079

Oil

ring
0
04

to
0
08

0

0015
to

0
0031

I
0
2
0

0079

Ring
gap

Standard
Wear
limit

mm
in

mm
in

Top
ring
0
2

to
0
35

1
0
0
0394

0
0079
to

0
0138

2nd

ring
0
2

to
0
35

1
0
0
0394

0
0079
to

0
0138

Oil

ring
0
3
to
0
9

1
0
0
0394

0
01
8

to
0
0354

3

Place
the

ring
at
the
bottom
of
the

ring
traveled

part

of
cylinder
bore
in
which
it
will
be
used

Square

ring
in
bore

by
pushing
it
into

position
with
the

head

piston
Measure

gap
between
ends
of

ring
with

feeler

gauge

Gap
should
be

as
listed
above

Fig
EM
53

Ring
gap
measurement

ENGINE
MECHANICAL

Note
8
When
the

piston
ring
only
is
to
be

replaced

without
the

cylinder
bore

being
corrected
measure

gap
at
the
bottom
of
the

cylinder
where
the
wear
is

minor

b
Oversize
piston
rings
are
available
for
service

50
100
150
oversize

4

Measure
the

piston
pin
hole
in
relation
to
the
outer

diameter
of
the

pin
If
wear
exceeds
the
limit

replace

such

piston
pin
together
with
the

piston
on
which
it
is

installed

Piston

pin
diameter

mm
in
17447
to
17452

0
6869
to
0
6871

65
23
to
65
48

2
5681
to
5
779
Piston

pin
length

mm
in

Piston

pin
hole
dia

meter
mm
in
17460
to
17453

0

6874
to
0
6871

5

Fitting
of

piston
pin

Determine

the

fitting
of

the

piston
pin
into

the

piston

pin
hole
to

such
an
extent
that
it
can

be

rmger
pressed
at

room

temperature
This

piston
pin
must
be

tight
press

fitted
into

the

connecting
rod

EM131

Fig
EM
54

Piston

pin
fitting

EM
19
g

1

EM132

Fig
EM
55

Measuring
piston
pin
diameter

Piston

pin
to

piston

clearance

mm
in
0

006
to
0

008

0
0002

to
0
0003

Interference
fit
of

piston

pin
to

connecting
rod

mm
in
0
020
0
0008

CONNECTING
ROD

If
a

connecting
rod
shows

any
scratch
or
score
mark

or
is

pitted
on

both
sides
of
the
thrust
face
and
the

large

end

correct
or

replace
it

EM133

Fig
EM
56

Connecting
rod

aligner

2
Check

for
bend
or
torsion

using
a

connecting
rod

aligner
If

bend
or
torsion

exceeds
the
limit
correct
or

replace
the

connecting
rod

ENGINE

Standard

IMaXimum

Connecting
rod
bend

or
torsion

per
100
mm

or
3
94
in

length

mm
in
o
os

0
0020

0
07

0
0028
0
1

0

0039
bend

torsion

3

When

replacing
the

connecting
rod
select

the
rod

so

that

weight
difference
between
new
and
old

rods
is

within

S

gr
0

18
oz
in

unit

weight

4
Install

connecting
rods

with

bearings
on
to
the

corresponding
crank

pins
and
measure
the
thrust
clear

ance
If

the
measured

value
exceeds
the
limit

replace
such

connecting
rod

Stan
dard
Maximum

Big
end

play

mm
in
0
2

to
0
3

0

0079
to
0
Ql18
0
4
0

0IS7

l
8ig
end

plav

A

t

f

L

Fig
EM
57

Big
end

play
check

CRANKSHAFT

Check
the
crankshaft

journal
and

crank

pin
for
scars

biased
wear

and

cracks

Repair
or

replace
as

required

EM
20
27
00
to
27
05
1
063
to
1
065

19

1Ot01940

r
19
10t019
40

fO
752
to
0
764

Ii
10
75Z
to
0
764

I

c
1

r

1tf
1

I

J
X
I

34
97
to

35
03

t

11
377
to
1
379

49
951

to
49

964
dia

11
9666

to
1

96711

ALL
MAIN
BEARING

JOURNALS

Fig
EM
58

Crankshaft

Standard

Taper
out
of
round

of
crank

journal
and

crank

pin
mm

in
0
01

0

0004
44
961
to
44
974
die

11
7701
to
1

7706

ALL
CRANK
PINS

UNIT
ffim

in

Maximum

0
03

0
0012

2

Check
the

crankshaft
for
bend
If
the

bend
exceeds

the
limit

replace
the

crankshaft

Bending
limit

0
05mm
0
0020
in

Standaia
0
015mm
0

0006
in
or
less

Fig
EM
59

Crankshaft
bend
check

ENGINE
MECHANICAL

Standard
Maximum

Crankshaft
bend

mm
in
0
05

0

0020
0

015

0

0006

Note

When
measuring
bend
use
a
dial

gauge

Bend
value
is

a
half
of
the
reading
obtained
when

the
crankshaft
is
turned
once
with
the
dial

gauge

applied
to

its
center
journal

3

After
regrinding
the
crankshaft
fmish
it
to
the

necessary
size
indicated
in
the
lists

on

pages
EM
25

by

using
an

adequate
undersize
bearing
according
to
the

extent
of

required
repair

4
Install
the
crankshaft
in
the

cylinder
block
and

measure
the
thrust
clearance

Fig
EM
60

Crankshaft
end

pldy
check

Standard
Limit

Crankshaft
free
end

play
rom

in
0
05
to
0
15

0
0020
to
0
0059
0
30

0
D118

5
Check
the

main
drive
shaft

pilot
bearing
at
the
rear

end
of
the
crankshaft
for
wear
and

damage

Replace
it
if

any
defects
are
detected
BUSHING
AND
BEARING

Measuring
main

bearing

clearance

Check
all

bearings
and

bushings
for
seizure
melt
scar

and

burr

Replace
bushings
if

any
defects
are
detected

2

Wipe
off
oil

and
dust

especially
the
rear
of
the

bushing

3

Set
the
main

bearing
on
the

cap
block

Scale

Plastigage

EM141

Fig
EM
61

Plastigage

4
Cut
a

plastigage
to
the

width
of
the

bearing
and

place

it
in

parallel
with
the
crank

pin
getting
clear

of
the
oil

hole

Install
the

cap
on
the
assembly
and

tighten
them

together
with
the

specified
torque

Tightening
torque

5

0
to
6

0

kg
m
36

to
43

ft
lb

Note
Be

sure
not
to
turn

the
crankshaft
when
the

plastigage
is

inserted

5
Remove
the

cap
and
measure
width
of
the

plastigage

at
its
widest

part
with
the
scale

printed
in
the

plastigage

envelope

EM
21

ENGINE

Pig
EM
62

Bearing
clearance
check

Measuring
connecting
rod

bearing
clearance

Measure

connecting
rod

bearing
clearance
in
the

same

manner

Tightening

torque

3
2
to
3

8

kg
m
23

to
28
ft
Ib

Bearing
oil
clearance

Standard
Wear
limit

Main

bearing

clearance

rom
in
0
020

to
0
062

0

0008
to
0
0024
0
1

0
0039

Connecting
rod

bearing

clearance

mm
in
0
020

to
0
050

0
0008
to

0
0020
0
1

0
0039

2
If
clearance
exceeds
the

specified
value

replace

bearing
with
an

undersize

bearing
and

grind
out
the

crankshaft

journal
adequately
Fig
EM
63

Bearing
clearance
check

Fitting
crankshaft
bearings

I
Set

the
bushings
on
the
main

bearing
cap
and
the

cylinder
block

bearing
recess
and

tighten
the

cap
bolts
to

the

specified
torque

Tightening
torque

5
0
to
5
3

kg
m
36
to
38
ft
lb

2
Loosen
the

cap
bolt
on

one
side
and
measure

clearance
between

the

cap
and

cylinder
block
side

n
n

u

ii
Bearing

6
Weight

EM143

Fig
EM
64

Bearing
crush
check

EM
22

Bearing
thickness

mm

in

STD
I
No
1

I
No
2

I

I
I
1
585

to
1
565

No

3

0

0624
to
0
0616

I
No
4

I

No
5

I

NO

11

0
25

I
1

710
to
1

690

undersize
No

3

0
0673
to

0
0665

I
No
4

I

No
5

I

No
1

I

I
No
2

I

0
50

I
1
835

to
1
815

undersize
No
3

0

0722
to
0
0715

No
4

No
5

I

I
No
1

I
No
2

I

0
75

I
11
960
to

1
940

undersize
No
3

0

0772
to
0

0764

I
No
4

I

I
No
5

I
ENGINE

Camshaft

journal

diameter
mm

in

D
783
to
43
796

1
7237

to
1
7242

43
283
to
43
296

1
7041
to
1
7046

42

783
to

42
796

1

6844
to

1
6849

42
283
to
42
296

1
6647
to
1
6652

41
208

to
41
221

1

6224
to
1
6229

43

533
to
43
546

11
7139
to
1
7144

43
023
to
43
036

1
6983
to
1
6943

42

523
to
42
536

1
6741
to
1
6746

42
023
to
42

036

1
6544
to
1
6550

40
958
to

40
971

1
6t25
to
1

6
30

43
283
to
43
296

1
7041
to
1
7046

42

773
to
42
786

1
6840
to
1
6845

42

273
to
42
286

11
6643
to
1
6648

41
773
to
41
786

1

6446
to
1
6451

40
708
to
40
721

1

6027
to
1
6023

43

033

to
43
046

1
6942
to

1
6947

42
523

to
42

536

1
674t
to

1
6746

42
023
to
42

036

1

6554
to
1
6550

41
523
to
41
536

1
6348
to
1

6353

40
458
to
40
471

1
5928
to
1
5933

EM
24
MISCELLANEOUS
COMPONENTS

Crankshaft

sprocket
and
camshaft

sprocket

I

Check
tooth
surfaces
for

flaws
and
wears

Replace
defective

sprocket

2

Install
the
camshaft

sprocket
in

position
and

check

for
run
out

If
it
exceeds
0
1
mm

0
0039
in

replace
the

camshaft

sprocket

Check
the

camshaft

thrust
deviation
If
it
is

deviated

replace
the

camshaft

locating
plate

f

EMl48

Fig
EM
66

Camshaft
sprocket
run
out
check

Clearance

limit
0
Imm

0

0039
in

SJ
l

ldar
Q
0
02

to
0

08mm

0

0008
to
0

0031
in

Fig
EM
67
Check

locating
plate
thrust
clearance

ENGINE
MECHANICAL

Standard

mm
in

Camshaft

sprocket

run
out

Thrust
deviation
O
OIS

0
0006

Locating
plate

thrust
clearance
0
02
to

0
08

0
0008
to
0
003
Wear
limit

mm
in

less
than

0

0

0039

O

OS

0

0020

0
1

0

0039

3

Check
the

chain
for

damage
excessive

wear
and

stretch
at

its
roller

links

Replace
chain
if

defective
Flyw
heel

I

Check
the

clutch
disc
contact

surface
of
the

flywheel

for

damage
and

wear

Repair
or

replace
if

necessary

2

Measure
deviation
of
the

clutch
disc
contact
surface

with
a
dial

gauge

If
it

exceeds
0
2

mm
0
0079
in

replace
it

3

Check

tooth
surfaces
of
the

ring
gear
for

flaw
and

wear

Replace
if

necessary

Note

Replace
the

ring
gear
at

about
180
to

2000C
356

to
3920

Fl

ENGINE
ASSEMBLY

PRECAUTION

CYLINDER
HEAD

PRECAUTION
CONTENTS

EM
25

EM

25

Use

thoroughly
cleaned

parts
Particularly
make

sure

that
oil

holes
are
clear

of

foreign
matter

2

When

installing
sliding
parts
such
as

bearings
be

sure

to

apply
engine
oil

to
them

3

Use
new

packings
and
oil
seals

4

Keep
tools

and
work
benches
clean

S

Keep
the

necessary
parts
and
tools
near
at
hand

6
Be
sure
to

follow

specified
tightening
torque
and

orders

CYLINDER
HEAD

Assembly
of
valve
and
valve

spring

Set
the
valve

spring
seat
in

position
and
fit
the
valve

guide
with
the

oil

lip
seal

Assemble
the

parts
in
order
valve

spring
spring

retainer

valve
collet
and

valve
rocker

guide
PISTON
AND
CONNECTING
ROO

ASSEMBLING
ENGINE
EM
25

EM
26

I
I

11

00
I
I

I

t

I
J

ftr

J

J

1

l

J

r

N

1

n
r

VI

I

I

C

I

L

I

Fig
EM
68
Valve
installation

Note
Make

sure
that
the
valve
face
is
clear
from

foreign

matters

PISTON
AND

CONNECTING

ROD

Assemble

piston
piston
pin
and

connecting
rod

assorted

according
to

cylinder
number

for

every
cylinder

EM
25