Valve Spring; Valve Rocker Shaft And Rocker Arm; The Intake And Exhaust Valves; Spring Specifications - Datsun 1200 1971 Workshop Repair Manual

IBglne
Note When the valve
head
has been
reduced
to
0 0197 in
or
less in thickness
replace
the valve
Grinding
allowance for the valve stem
end surface is 0 0197 in
or
less
Valve
spring
Measure the free
length
and the
tensIOn
of
each spnng
If the measured value exceeds
the
specIfied
hmlt
replace
the sprlllg
Check each spnng
for
deformatIOn with
a
square
Any
sprmgs
w1th deflectIOn of 0 0630
III or
more
must
be
replaced
Valve Rocker Shaft and Rocker Arm
Check the valve rocker shaft and rocker
arm
1
N
in
00
9E
22
N
o
NO
I
I
I
I
1
I I
Ll
gE
N
cno
CX
co
00 r
o
171M
OtM
Be
22
Bo
l
N
11 lit
l
o
cnM
l
Q
1
45 30
290
to
29 2 die
1142
to
1
1501
N
I
350
to
35 2dla
1 378
to
1386
INTAKE
EXHAUST
UNIT
mm
lnl
Fig
30 The Intake and exhaust valves
Fig
31 Valve
grinder
for
seizure
and
wear
and
repair or
replace
as
required
Valve rocker
arm
to shaft 011 clearance
o 0008 to
0 0020
III
Spnng specIficatIOns
Free
length
1
831
In
Valve closed
1 524
In
at
52 7
Ib
Valve open
I 19
III
at
1291b
EM J
Fig
32 Valve spring test
Fig
33 Valve rocker shaft
lB