Datsun 1980 200SX Service Manual page 248

6
Remove side
plate
C
pressure
modifier valve
and spring 2nd 3rd
shift valve
spring and plug and
I st
2nd shift
valve
and spring
Place each loose part
on a
rack
to
retain sequence of assembly
AUTOMATIC TRANSM ISSIO
N
Major Overhaul Operations
Manual valve
was
removed
when
valve
body
was
removed from
trans
mission Include valve in
subsequent
inspection
and service sequence
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Lower valve
bOdY
Spring
Spring
C
Plug
1
2
d
shif
11
Pressure modifier
valve
it
n
t valve
Spnng
nd 3rd shift valve
I
g
I
Slde plate
e
A
A
I
Precaution for
inspection
A
newly
manufactured valve
body
represents
precision
manufactured
valves assembled with close tolerances
into
precision
bores of the valve
body
If
inspection
reveals
excessive clear
ances
0 03mm 0 0012
in
or
more
between the valves and the valve
body
bores
replace
the en1ire valve
body
rather than
attempt
rework
If
one or more
valves
are
sticking
from varnish
deposits
or
burns resulJ
ing
from deteriorated oil
or
overhea1
ing
you may
be able
to
clean the
valves and valve bodies
Always
use
croeus
cloth
which
is
a
very fme type
of
cutting material Never
use
emery
cloth
as it
is
too
coarse
and
can
scratch the valves
or
valve
bores
Scratches
can
lead
to
future
deposits
of varnish
or
foreign matter
SAT044
During cleaning
do not
remove
the
sharp
edges of the valve When edges
are
rounded
or
scratched entry
is pro
vided for dirt
or
foreign
matter to
work into the sides of the valves and
hinder valve
movement
The valves
may
be
cleaned
using
alcohol
or
lacquer
thinner The valve
bodies
can
be
dip
cleaned with
a
good
carburetor cleaner
or
lacquer thinner
Do
not
leave valve bodies
SUbmerged
in carburetor cleaner
longer
than five
minutes Rinse parts
thoroughly
and
dry
Lubricate all parts in clean
auto
matic
transmission fluid before
reas
sembly
7 Check valves for
signs
of
burning
Replace
if
beyond
clean up
8 Check oil
strainer
for
general
con
dition Replace
if necessary
9
Check
separator
plate for
scratches
or
damage Replace if
neces
sary
Scratches
or score
marks
can
cause
oil
to bypass correct
oil passages
and result
in
system malfunction
Co
nDl l D o
o
o
o
0
b
nnn
0
0
0
1 0
0
oo
0
SA T046
10 Check oil passages
in upper and
lower
valve
bodies for varnish
deposits
scratches
Or
otber damage
that would
impair valve
movement
Check thread
ed holes and related bolts and
screws
for
stripped
threads replace
as
needed
II Test valve springs for weakened
load condition
Refer to Valve Body
Spring
Chart for spring specifications
Valve
body
spring
chart
i5
l
O
Free
length
I
As installed
I
r i j
0
Wire dia
SAT039
AT 41