Datsun C210 series Manual page 42

2
Y
4
EM304
Fig
EM 35
Measuring Cylinder
Bore diameter
4
When
wear
taper
or
out of round
is minor and within the limit
remove
the step
at
the
topmost
portion
of
cylinder using
a
ridge
reamer or
other
similar tool
CYLINDER
BORING
1 When any cylip
der needs
boring
all other
cylinders
must also be bored
at
the
same
time
1 Determine
piston
oversize accord
ing
to
amount
of
wear
of
cylinder
Refer
to
Se
vice Data and
Sptfcifica
Hons
3
The size
to
which
cylinders must
be
honed
is
determined by adding
piston ta cylinder
clearance
to the
pis
ton
skirt diamete
A
Fig
EM 36 Measuring Piston
Diameter
Note Measure dimension
a
at posi
tion
shown below
Dimension
a
distance from
center
of
pin
Approximately
20
mm
10
79 in
Engine
Mechanical
o
EM714
Measuring Piston
Skirt
Diameter
Rebored size
calculation
D A B C A 0
005
to
0 0 25
mm
0 0002
to
0
0010
in
where
D Honed diameter
A Skirt diameter
as
measured
B Piston to wall clearance
C
Machining
allowance
0 0 2
mm
0 0008 in
Fig EM 37
CAUTION
a
To
prevent
strain due
to
cutting
heat bore the
cylinders
in the order
of 1 5 3 6 2 4
b Before
boring
any
cylinder
install
main
bearing
caps in
place
and
tighten to
the
specification
so
that
the crankshaft bearing bores will
not
become distorted from the bor
ing operation
4 Do
not cut too
much
out
of
cylinder
bore at
a
time Cut
only
0 05
mm
0
0020
in
or so
in diameter at
a
time
5 Measurement of
a
just
machined
cylinder
bore
requires
utmost
care
since it is
expanded by cutting
heat
6 As
a
final step
cylinders
should
be
honed to
size
7 Measure
the finished cylinder
bore for out of round
or
tapered
part
Refer
to
Service
pata
and Specifica
tions
8
Measure piston
to
cylinder clear
anc
This
clearance
can
be checked
easily by using
a
feeler
gauge
afld
a
spring
balance
hooked
on
feeler
gauge
measuring
the
amoU 1t
of force
re
quired to pull
gauge
out
from
between
piston
and
cylinder
EM 11
Feeler gauge used
0 04
mm
0 0016 in
Extracting
force
2 0
to
14 7N
0 2
to
1 5
kg
0 4
to
3 3 Ib
Note
3
When
measuring
clearance
slowly
pull
feeler gauge straight
upward
b It is reconinended that
piston and
cylinder
be heated
to
200C 680F
I
I
P
EM305
Fig EM 38 Measuring Piston Fit
in Cylinder
Note
If
cylinder
bore has
worn
be
yond
the
wear
limit
use cylinder
liner
Undersize cylinder liners
are
avail
able
for
service
Interference fit of
cylinder
liner in
cylinder block should be 0
08 to
0 09
rnm
0 0031 to 0 0035 in
PISTON
PISTON
PIN AND
PISTON RING
1 Measure the side
clearance of
rings
in
ring
grooves
as
each ring is
installed
If side clearance exceeds
the
speci
fied
limit
replace piston together
with
piston ring
Max tolerance of side
clearance
0 1
mm
10
004 in