Datsun 1980 200SX Service Manual page 262

Cut back point
The
cut
back point
indicates
a
point
where line pressure
changes
from
high
to
low
value
a output
shaft
AUTOMATIC TRANSMISSION
Trouble
shootingandOiagnoses
rotation is
gradually
increased from
stall
point
The
car
speed and out
put
shaft
rotation at
that
cut
back
point
are
as
indicated in chart
below
Intake manifold
vacuum
Car speed
Propeller
shaft
revolutions
kPa mmHg inHg km h MPH
rpm
o 0 0
40
48
25
30
1
310
1 560
13 3
100 3 94 20 28
13
17
660 910
GOVERNOR PRESSURE
I
Install pressure gauge
to governor
pressure port
Locate
the
ga ge so
it
can
be
seen
by
driver
2
Road
test
car
and
note
pressure
at
different road
speeds
Gov
mor
pres
sure
increases
directly with road
speed
and should always be less
than line
pressure
STALL TESTING
The stall test is
an
effective method
of
testing
clutch and
band
holding
ability
to rque converter
one way
clutch
operation
and
engine perform
ance
A stall test
should only be
per
formed
as a
last resort
because of
the
high l1uid temperature
it
generates and
the
excessive
load
it places
on
the
engine
and
transmission
1
CAUTION
a
Transmission and
engine
fluid levels
should
alwavs
be checked and fluid
added
as
needed
b Run
engine
at
1 200 rpm
to
attain
proper
warm
up
c
During test
never
hold throttle
wide open for
more
than 5 seconds
d Do Not
test
more
than
two
gear
ranges without
driving
car
to
cool
off
engine
and transmission
STALL TEST
PROCEDURE
1
Install
a
tachometer where it
can
be
seen
by
driver
during
test
2
Set
hand
brake and block wheels
3 Start
engine
and
place
shift lever
in
D
range
4
Apply foot brake
and
accelerate
to
wide open throttle Do
not
hold
throttle open longer
than five
seconds
5
Quickly
note
the
engine
stall
speed
and
immediately
release throt
tle
Stall revolution
1 650 1 950 rpm
6
Place shift lever in R
range
and
repeat
above
test
same as
in D
range
If stall
test
indicates proper stall
re
volution in D
range
no
further
tost
ing is necessary
STALL TEST
ANALYSIS
I
Satisfactory results
in
0
range
indicates
rear
clutch
one
way
clutch
of
transmission
apd
sprag
flutch
of
torque
converter are functioning
pro
perly
2 Stall revolution in 0 range 1st
gear is above
car
specified
The
rear
clutch
is
faulty
3 Stall revolution in R
range
is
above specified revolution for 0
range
Low and Reverse Brakes
are
faulty
4 Stall revolution in 0
range
1St
gear is below
specified
revolution
Converter
sprag
clutch is
faulty
slipping
or
engine
is not
performing
properly
If
converter
sprag clutch is frozen
car
will have poor
high
speed
perfor
mance
If
converter
sprag
clutch is
slipping
car
will be
sluggish
up
to
50
or
60 km h
30
or
40 MPHl
AT
55