Cylinder Head Surface Flatness; Inspection And Repair; Checking Cylinder Head Mating Face; Valve Assembly - Datsun 1200 1971 Workshop Repair Manual

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WAI
CI
o o
WAIl
Cl
I
Fig
26 Valve components
FIg
27
Cylinder
head
Cyhnder
head surface flatness
Standard
MaxImum
m m
Al2
Engme
less than
o
0020 o 0039
INSPECTION AND REPAIR
Preparation
Check the
cyhnder
head and
cylinder
block
for traces of
water
leaks before
cleaning
Clean all
parts
to
remove
011
stains
carbon
depoSits
fur and other
foreIgn matters
com
pletely
M k
s l r
1at
all
o
hol Lare
clear
Blow
air
Into them If
reqUIred
18
Fig
28
Checking
the
cylinder
head surface
Fig 29 CheckIng valve stem dIameter
Secure
proper
assembly carefully
Cylinder
Head
Checking cylinder
head
mating
face
VIsually
check for cracks and flaws
Measure the surface of the
cyhnder
head
on
the
cyhnder
block SIde for warping If It
ex
ceeds the hmlt indIcated below
regrind
afTec
ted surface wIth
a
surface
grinder
Valve
Assembly
Check
each of the Intake and exhause valve
assembhes for
worn
damaged
or
deformed
valve
caps
and
stems
Correct
or
replace
the
valve If
reqUIred
The valve face
or
valve
stem
end surface
should be refaced
by
usmg
a
valve
gtlnder
Notes
a
Deflection of
seat
surface
against
axis should be 0 0012 in
or
less
b
o rr
ctnes
f
right angle
and
out
of round should be 0 0004 in
or
less