Cylinder Block; Piston, Piston Pin And Piston Ring; Measuring The Cylinder Bore; Piston And Connecting Rod Assembly - Datsun 1200 1971 Workshop Repair Manual

ted compare valve
ttmmg
data wIth the valve
I
ttmmg
diagram to
ensure
that
begmmng
and
endmg
of stroke for all cylmders
are com
plymg
with
specified
advance
and
retard
figures
Cylinder
Block
Check the cyhnder
head
v1sually
for defects
such
as
cracks
and flaws
Measure the
top
of the
cyhnder
block
cyhn
der head matmg
face for warpmg If the
warp
exceeds the hmlt
correct 1t
Measure
the
cyhnder
bore
for
out
of round
and
wear
WIth
a
bore
gauge
If
wear or
out of
round
IS exceSS1ve
rebore the
cyhnder
walls
by
means
of
a
bormg
machme
Umt degree
a
b
d
f
c
e
248
248 14
54 12 56
Standard
MaxImum
tolerance
Surface flatness
less than
o 0020
o
0039
m
Distortion limIt
0 101010 00039
In
Standard 0051010 100020 In
or
less
Fig 36 Cylinder block surface check
Bogioe
When
wear or
out
of
round
1S
mmor
and
wlthm the hmlt
remove
the
step
from the top
most
portIOn
of
the cyhnder by
the
use
of
a
ridge
reamer or
other slm11ar tool
Piston Piston Pin and Piston Ring
Check for
seIzure
scratch
and
wear
Replace
as
reqUIred
Measure Side clearance of each
piston rmg
and ring groove WIth the
piston
rmg mstalled
on
the piston
Clearance of
a new
pIston and
p1ston
rmg
should be
as
follows
Place the
rmg
at
the
bottom of the rmg
traveled
part
of
cyhnder
bore
m
wh1ch
It
wlll
be
used
Wear
limIt 02mm
0 0079 In
I
Fig
37
MeaSUring
the
cylinder bore
SAO
I
O
I
f
Fig
38 Piston and connecting rod assembly
II