Cylinder Head Recess Diameter; Valve Springs; Camshaft And Camshaft Bearings Checking; Cylinder Block Inspection And Overhaul - Datsun 510 series Workshop Manual

CYUNDER HEAD RECESS DIAMETER
Standard inoerts
Engine
L14
Ll6 and Ll8
Inlet
41 000 41 016 16142 16148 in
45 000 45 016
mm
1 7 7l7
1 77231n
Engine
Ll4
Ll6 and Ll8
Exhaust
37 000 37 016mm 1 4567 1 4573 in
37 000 37
016mm l
4567 1 4573 in
CYLINDER HEAD RECESS DIAMETER
Oversize inserts
Engine
Ll4
Ll6andLl8
Inlet
41
500 41
516mm l
6339 1 6345in
45 S00 45 516mm I 7913 1 7920in
Engine
L14
Ll6andLl8
Exhaust
37 500 37 516mm 1 4764 14770in
37 500 37 516mm 1 4764l4770in
Dimensions for the standard valve inserts
are
shown in
Fig
A 17 Heat the
cylinder
head
to
a
temperature
of ISO 20DOC
302 3920F and drive in the inserts making
sure
that
they
bed down
correctly The inserts should be caulked
at
more
than
four
positions
and then cuf
or
ground
to the specified
dimensions shown in
Fig A
IS
Place
a
small
amount
of fine
grinding compound
on
the
seating
face of the valve and insert the valve into the valve
guide
Lap
the valve
against
its
seat by rotating
it backwards and
forwards
approximately
half
a
revolution in each direction
until
a
continous seating has been obtained Remove the valve
and clean all traces
of the grinding compound from valve and
seat
VALVE SPRINGS
The valve springs
can
be checked for squareness using
a
steel square and surface plate If the spring is
out
of square by
more
than 16mm 0 063 in it must be
replaced
Check the
free
length
and the load
required
to
deflect the
spring
to its
assembled height Compare the
figures
obtained with those
given
in Technical Data and replace the
spring
if the
specified
limits
are
exceeded
CAMSHAFT AND CAMSHAFT BEARINGS
Checking
Measure
the clearance between the inner diameter of the
camshaft
bearing
and the
outer
diameter of the camshaft
journal If the
wear
limit for the
bearing
clearance exceeds
O lmm 0 0039 in it will be necessary to
replace the cylinder
block
assembly
See Technical Data for all diameters
Check the camshaft and camshaft journals for signs of
wear or
damage
ace
the camshaft in V Blocks
as
shown in
Fig
A 19 and
position
the dial gauge
to
the journal The
run out
of the
cam
shaft must
not
exceed 0 05
mm
0 0020in It should be noted
that the actual
run
out
will be half the the value indicated on
the
dial
gauge
When the camshaft is turned
one
full revolution
with the dial gauge positioned
against
the second and third
journals
CYLINDER BLOCK
Inspection
and Overhaul
Ensure that the
cylinder
block is
thoroughly
clean and
check it for cracks and flaws
Check the joint
face of the block for distortion using
a
st r ai g ht edge
and feeler gauge
as
shown in Fig
A 20 The surface
must be
reground
if the maximum tolerance of O lmm
0 0039 in is exceeded
Examine the cylinder
bores for
out
of round
or taper
using a
bore gauge
as
shown in Fig A 21 The
readings
must
be taken
at
the
Top
middle and bottom
positions indicated
in Fig A 22
The standard bore diameters are
83 000 83 050
rom
3 2677 3 3 697
in for the 1400 and 1600cc engines and 85 000
85 050
mm
3 3465 3 3484 in for the 1800
cc
engine with
a
wear
limit of 0 2mm 0 0079 in
Out of round and
taper
must not
exceed 0 15mm
0 0006 in If the bores
are
within the specified limits
remove
the carbon
ridge
at
the
top
of the cylinder bores
wring
a
suitable ridge reamer
If any of the bores
are
in
excess
of the specified limits
then all the bores
must
be rebored at the
same
time Pistons
are
available in five oversizes
See Technical Data and
can
be
selected in accordance with the amount
of
wear
of the
cylinder
When the oversize of the
pistons
has been decided it will
be
necessary to
measure
the piston
at
the piston
skirt
Fig
A 23
and add to
this dimension the
specified
piston
to
cylinder bore
clearance
to
determine the final honed measurement of the
cylinder
Machine the cylinder bores in
gradual stages taking only
a
0 5mm
0 002 in
cut
each time The bores
must
be
brought
to
the final size
by honing
and the block thoroughly cleaned
to
remove
all traces
of metal
Measure the finished bore and check the clearance between
each
piston
and its cylinder The clearance can
be checked
as
shown in
Fig
A 24 with the aid of
a
feeler gauge and spring
scale The standard clearance is 0 023 0 043
mm
0 0009
0 0017
in
NOTE
Cylinder
liners
can
be fitted if the cylinder bores
are worn
beyond the maximum limit
The liners are an
interference fit in the block and
must
be bored
to
the correct
inner diameter
after
fitting
Three undersize liners
are
available
in the
following sizes
11