Datsun C210 series - Page 39

PREPARATION FOR
INSPECTION
I Before
cleaning
check
for
sign
of
water
and oilloaks
2 Clean oil and carbon
deposits
from
all
parts They
should be
clean
from
gasket
or sealant
3 Clean
all
oil
holes
with
solvent
and
dry
with
compressed
air Make
sure that
they
are not
restricted
CYLINDER HEAD
AND
VALVE
CHECKING CYLINDER
HEAD
MATING FACE
CAUTION
Never
remove camshaft
bearings
unless
you
have a witable machine
for
boring
camshaft
bearing
in line If
you
once
remove
camshaft
bearings bearing
centers will be
out of
alignment
and
reconditioning
is
very
difficult without
center
borings
I
Make
a visual
check
for cracks
and
flaws
2
Measure
the
surface of
cylinder
head
on
cylinder
block side
for
warpage
If
beyond
the
specified
limit cor
rect
with
a
surface
grinder
Wa
page
of surface
Less than
0 1
mmIO
OO4
in
Fig
EM 21
Checking Cylinder
Head
Surface
Engine
Mechanical
INSPECTION AND
REPAIR
Note Surface
grinding
limit
The
grinding
limit of
cylinder
head
is
determined
by
the
cylinder
block
grinding
in
an
engine
Deptb
of
cylinder
head
grinding
is
A
Depth
of
cylinder
block
grinding
is B
The
limit is
as follows
A B 0 2
mm 0 008 in
VALVE
I
Check
each of the
intake and
exhaust
valve for
worn
damaged
or
deformed valve
caps
or
stems Correct
or
replace
the valve that
is
faulty
For standard
size
of
valve
refer to
Service
Data
and
Specifications
2
Valve face
or valve
stem end
surface
should
be refaced
by
using
a
valve
grinder
Note When
valve head
has been
worn
down to 0 5
mm 0 020
in
in
thickness
replace
the
valve
Grinding
allowance for valve stem
end surface
is
0
5
mm 0 020 in or
less
Fig
EM 22
Regrinding
Value Face
VALVE
SPRING
I Check
valve
spring
for
squareness
using
a steel
square
and
surface
plate
If
spring
is out
of
square S more
than
specified
limit
replace with new
ones
EM 8
Out
of
square
S
I
Outer
Less than
22 mm 0
087 inl
Inner
Less than
1 2 mm 0 047
in
s
u
I
EM296
Fig
EM
23
Mecuuring
Spring
S9uar
n SI
2
Measure the free
length
and the
tension
of each
spring
If the measured
value
exceeds the
specified
limit re
place
spring
Refer
to
Service Data and
Specifica
tions
EMl13
Fig
EM
24
Measuring
Spring
Ten ion
VALVE
GUIDE
n
Measure the
clearance between
valve
guide
and
valve stem If the
clearance exceeds the
specified
limit
eplace
the worn
parts
or both
valve
and
valve
guide
In this
case
it is
essential to determine if
such a clear
ance has been caused
by
a worn or
bent valve stem 0
by
a worn valve
guide