heating NISSAN 300ZX 1984 Z31 Automatic Transmission Workshop Manual

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

TROUBLE-SHOOTING AND DIAGNOSES
Preliminary Checks
(Prior to Road Testing)
FLUID LEAKAGE
To detect a fluid leak
1) Raise vehicle
2) Clean area suspected of leaking
3) Start engine, apply foot brake, place control
lever in drive, and wait a few minutes
4) Stop engine
5) Check for fresh leakage
FLUID CONDITION
Examine the AT F and note its color, texture,
and odor
1) Dark of Black Fluid
With a burned odor
- Worn friction material
2) Milky Pink Fluid Water Contamination
- Road water entering through filler
tube or breather
3) Varnished Fluid, light to dark brown and
tacky Oxidation
- Over or Underfilling
- Overheating
- Road Testing
Before starting road tests, install vacuum gauge
SAT596
Perform road tests, using "Symptom" chart, as
follows
"P" RANGE
1 Place the control lever in "P" range and start
the engine Stop the engine and repeat the
procedure in all other ranges and neutral
2. Stop vehicle on a slight upgrade and place con-
trol lever
in "P" range Release parking brake
to make sure vehicle remains locked
"R" RANGE
1 Manually shift the control lever from "P" to
"R", and note shift quality
2 Drive the vehicle in reverse long enough to
detect slippage or other abnormalities
"M" RANGE
1 Manually shift the control lever from "R" and
"D"
to "N" and note quality.
2. Release parking brake with control lever in
"N" range Lightly depress accelerator pedal to
make sure vehicle does not move (When
vehicle
is new or soon after clutches have been
replaced, vehicle may move slightly This
IS not
a problem )
"D" RANGE
1 Manually shift the gear selector from "N" to
"D" range, and note shift quality.
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AT-63