Valve body NISSAN 300ZX 1984 Z31 Automatic Transmission Workshop Manual

GENERAL SERVICE NOTICE
Repai
Before proceeding with disassembly, thorough-
ly clean the outside of the transmission It IS
important to prevent the internal parts of the
transmission from becoming contaminated by
dirt or other foreign matter.
Disassembly should
be done in a clean work
area. Use
a nylon cloth or paper towel for wiping
parts clean. Common
shop rags can leave lint
that might interfere with the transmission's
operation.
When disassembling parts, be sure to place
them in order
in parts rack so they can be put
back in the unit
in their proper positions
All parts should be carefully cleaned with a
general purpose, non.flammable solvent before
inspection or reassembly.
Gaskets,
seals, and O-rings should be replaced.
It is also very important to perform functional
tests whenever it is designated.
The valve body contains many precision parts
Contri
CONTROL VALVE UPPER BODY
3rd4th shift valve7
Pressure I
Uotes
and requires extreme care when parts are
removed and serviced. Place removed parts on
a parts rack so they can be put back in the
valve body in the same positions and
se-
quences. Care will also prevent springs and
small parts from becoming scattered or
lost
Before assembly, apply a coat of recommended
A
T.F. to all parts Vaseline may be applied to
O-rings and
seals. Do not use any grease.
Care should be taken to avoid damaging
O-rings, seals and
gaskets when assembling
Abbreviations used throughout this section stand
for the following.
A.T.F. ... Automatic transmission fluid
D, ........ Drive range 1st gear
D, .... ... Drive range 2nd gear
D, . . ... Drive range 3rd gear
D4 ........ Drive range 4th gear
0.D . .... Overdrive
1, ....... . 1 range 2nd gear
1, . . .... 1 range lstgear
Valve
Vacuum throttle valve
f rThrottle back-up valve
1st 2nd shift valve
2nd3rd shift valve
Second lock valve -i
SAT742
AT-4

GENERAL SERVICE NOTICE
Control Valve (Cont'd)
CONTROL VALVE LOWER BODY
3rd-2nd timing valve
f --
, /
-7, - _- _:. - A=----* --
-
SAT705
Lock-up Control Valve and O.D. Cancel Valve
Retaining pin1
SAT498
AT-5

ON-VEHICLE SERVICE
Contrl
1. Drain fluid by removing oil pan.
2. Remove kickdown solenoid and vacuum dia
phragm
23 rod
Be careful not to lose vacuum rod.
Vacuum diaphragm
SAT506
3. Remove control valve assembly.
Be careful not to drop manual valve out of valve
body.
4. Disassemble, inspect and assemble control valve
assembly Refer to Control Valve Body.
5. Install control valve assembly.
0 Set manual shaft at Neutral, then align manual
plate with groove in manual valve of control
valve assembly.
Securing bolts come
in 3 different lengths. 0
1 40 mm I1 51 in) 2 35 mm (1 38 in1 3 25mm1098mI
After installing control valve to transmission
case, make sure that control lever can be
moved to all positions.
6 Install kickdown solenoid and vacuum dia-
phragm
& rod.
Make sure that vacuum diaphragm rod does not
interfere with side plate
of control valve.
AT-I 0

Vacuum Diaphragm Rod
Adjustment
1. Remove diaphragm from transmission case.
2 Using a depth gauge, measure depth "L". Be
sure vacuum throttle valve is pushed into valve
body
as far as possible.
3 Check "L" depth with chart below and select
proper length rod.
Measured depth "L"
mm (in)
Under 25 55
(1 0059)
25 65
- 26 05
(1 0098
- 1 0256)
26 15
- 26 55
(1 0295 - 1 0453)
26 65
- 27 05
(1 0492 - 1 0650)
Over 27 15
(1 0689)
Vacuum diaphragm
Rod length
mm (in)
29 0
(1 142)
29 5
(1 161)
30
0
(1 181)
30 5
(1 201)
31
0
(1 220)
Vacuum diaphragm
I1
rod
SAT078
Part number
31932- X0103
31932 - XO104
31932- XOlOO
31932- X0102
31932. XOlOl
Downshift Solenoid
1. Remove downshift solenoid and O-ring.
Catch
oil dropping out of the hole.
SAT516
2 Check to verify that downshift solenoid is
operatmg properly. If faulty, replace it with a
new one
SAT517
AT-I4

DISASSEMBLY
18. Remove control valve body.
Remove manual valve from valve body as a
precaution, to prevent valve from dropping out
accidentally.
SAT007
19 Remove 2nd brake band strut. Brake band and
clutch
& planetary gear pack [Including high-
reverse clutch (Front), forward clutch (Rear)
and front
planetary gear] may be removed
together
To prevent brake linings from cracking or peeling,
do not stretch the flexible band unnecessarily.
Before removing the brake band, always secure
it
with a clip as shown in the figure below.
Leave the clip
in position after removing the brake
band.
Flexible type band brake
2 mm 1008 In) dia wire
SAT656
20. Remove 2nd band servo retalning bolts. Apply
pressure to remove 2nd band =NO.
AT-25

REPAIR FOR COMPONENT PARTS
Oil Pump
011 pump inner gear,
pump =Over
1
011 pump housing
Lathe cur seal
011 seal
l
Lock-up control valve
DISASSEMBLY
1 Remove pump cover from pump housing
2. Stake off retaining pin using a punch [outer
dia.
1.5 to 1.8 mm (0.059 to 0.071 in)], then
remove lock-up control valve and spring
B
SAT721
SAT722
INSPECTION
1. Inspect pump body, bushing and pump shaft,
for
wear.
2. Inspect gears, lock up control valve, spring and
all internal surfaces for damage and visible
wear.
AT-28

REPAIR FOR COMPONENT PARTS
Control Valve Body
Upper body ride
Pressure regulator sleeve
Pressure regulator PlYg
Pressure regulator valve
Control valve upper body
Second
2nd-3rd shift Plug
Manual t
'v%! rVacuurn throttle valve
(@ ,-3rd4th shift valve -
3rd4th shift sleeve Pressure modifier WlYe
ate "6"
69
G
Throttle back-up valve
lrt3nd shift valve
2nd-3rd shift wlve
Side plate "A"
W
Lower body ride
3rd-2nd timing valve/
rControl valve lower body
&Retaining pin
SAT724
AT-34

REPAIR FOR COMPONENT PARTS
Control Valve Body (Cont'd)
I
@ Second lock valve
VALVE BODY SPRING CHART
055(00217) 555(021851 16 33 5 (1 319) 21 0 (0 827) 5 88 (0 60,1.32)
Free length
check
valve VG30E turbo 1 0 (0 0391 6 5 (0 256) 13 24 9 (0 980)
Outer
19 0 (0 748) 27 95 (2 85,6 28)
Numbers stamped on valve springs listed in table
~ below are the Same as those in the figure on the
previous page.
Orifice check valve
Servo orifice check
valve
3rd - 4th VG30E
@ shift
VG30E turbo
I nsta I led Outer coil
mm (in)
Wire dia No of Free length
Valve spring dia active
coil mm (in) Length mm (in)
mm (in) N (kg. Ib)
023 (00091) 50 (0 197) 12
0 8 (0 031) 6 6 (0260) 12 6
0 75 (0 0295) 6 1 (0 240) 13 6
-
Solenoid downshift 10 55 (0 0217) 15 55 (0 2185) I 12 @ valve
155(0610)
22 0 (0 866) 12 5 (0 492) 5 88 (0 60,l 32) I
11 5(04531 OlO(OOl.002)
30 3 (1 193)
I VG30E 1 09 (0035) 1 65(0256) I 14 relief
24 586
13 1 (0 516) (2 507, 528)
26 8 (1 055) 19 0 (0 748) 21 48 (2 19,4 83)
3rd - 2nd
valve
@ timing
VG30E 0 7 (0 028) 5 9 (0 232) 12 5 227(0894) 14.5(0571) 11 08(1.13,249)
VG30E turbo 0 9 (0 035) 7 4 (0 291) 9 207(0815) 14.5(0571) l648(1 68,370)
268(1055) I131 (0516) I 2138(218.481)
AT-35

REPAIR FOR COMPONENT PARTS
Control Valve Body (Cont'd)
DISASSEMBLY
1. Remove oil Strainer.
SAT564
2. Separate lower body, separator plate and upper
body.
Be careful not to scatter or lose orifice check valve,
servo orifice check valve, or throttle relief check
valve (ball)
and related spring.
AT168
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 clearances, 0.03 mm
(0 0012 in) or more, between the valves and the
valve body bores, replace the entire valve body
rather than attempt rework
If one or more valves are sticking from varnish
deposits or burns resulting from deteriorated oil or
overheating, you may be able to clean the valves
and valve bodies. Always use crocus cloth, which is
a very fine 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
During cleaning, do not remove the sharp edges of
the valve When
edges are rounded or scratched,
entry
is provided for dirt or foreign matter to work
into the sides
of the valves and hinder valve move-
ment
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 AT F before reassem-
bly
1 Check valves for signs of burning Replace if
2 Check oil strainer for general condition.
beyond clean-up
Replace
if necessary
SATMS
AT-36

REPAIR FOR COMPONENT PARTS
Control Valve Body (Cont’d)
3 Check separator plate for scratches or damage
Replace if necessary Scratches or score marks
can cause oil to by-pass correct oil passages
and result in system malfunction
SAT046
4. Check oil passages in upper and lower valve
bodies for varnish deposits, scratches or other
damage that would impair valve movement.
Check threaded holes and related bolts and
screws for stripped threads, replace
as needed
Test valve springs for weakened load condition
Refer to Valve Body Spring Chart for spring
specifications.
5
ASSEMBLY
1 Install orifice check valves, valve springs, throt-
tle relief valve spring and steel ball in valve
body
Lower valve body
Orifice check Valve-P for 2nd-3rd rhifl .. reiea* (VG30E turbo (I a xbo only)
-oroftee check valve
Throttle relief valve,
Orifice chkk valveJ (direct clutch applies) SAT743
Upper valve body
A
Onfice check valve--@ (Front clutch applies) h
2 Assemble separator plate and upper valve body
on lower valve body, then tighten bolts.
ReaGer bolt
When installing these bolts, first be sure to install
the two reamer bolts to their original positions.
3. Install oil strainer.
AT-37