Datsun C210 series - 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
0 025 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 02 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 24
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