Subaru SVX 1992 Manual page 493

AUTOMATIC TRANSMISSION AND DIFFERENTIAL [W3B2] 3- 2
3 . Performance Test
~
A: NECESSARY TEST GAUGES
1) Tachometer (It is desirable to be able to read to 50
rpm .) .
2) Vacuum gauge (It is used for measuring intake man-
ifold vacuum .) .
3) OIL PRESSURE GAUGE (498575400) .
4) OIL PRESSURE ADAPTER (498897200).
5) Stopwatch .
B : STALL TEST
1 . GENERAL
The stall test is of extreme importance in diagnosing the
condition of the automatic transmission and the engine .
It should be conducted to measure the engine stall
speeds in all shift ranges except the P and N ranges .
Purposes of the stall test
1) To check the operation of the automatic transmis-
sion clutch .
2) To check the operation of the torque converter.
3) To check engine performance.
2. TEST METHODS
Preparations before test
Check that throttle valve opens fully.
Check that engine oil level is correct.
3 Check that coolant level is correct.
® Check that ATF level is correct.
5~ Check that differential gear oil level is correct.
© Increase ATF temperature to 60 - 80°C (140 -
176°F) by idling the engine for approximately 30
minutes (with selector lever set to "N" or "P") .
1) Install an engine tachometer at a location visible
from the driver's compartment and mark the stall speed
range on the tachometer scale .
2) Place the wheel chocks at the front and rear of all
wheels and engage the parking brake.
P.108
3) Move the manual linkage to ensure it operates prop-
erly, and shift the selector lever to the D range.
4) While forcibly depressing the foot brake pedal, grad-
ually depress the accelerator pedal until the engine
operates at full throttle .
P
R
N '
D
3
Rra~kn pedal
Accelerator
pedal
B3-245
Fig. 112
5) When the engine speed is stabilized, read that speed
quickly and release the accelerator pedal.
6) Shift the selector lever to Neutral, and cool down the
engine by idling it for more than one minute .
7) Record the stall speed.
8) Perform the stall tests with the selector lever in the 3,
2 and R ranges .
a. Do not continue the stall test for MORE THAN FIVE
SECONDS at a time (from closed throttle, fully open
throttle to stall speed reading) . Failure to follow this
instruction causes the engine oil and ATF to deterio-
rate and the clutch and brake band to be adversely
affected .
Be sure to cool down the engine for at least one minute
after each stall test with the selector lever set in the P
or N range and with the idle speed lower than 1,200
rpm.
b. If the stall speed is higher than the specified range,
attempt to finish the stall test in as short a time as
possible, in order to prevent the automatic transmis-
sion from sustaining damage.
Specifications
Stall speed (at sea level) :
2,350 - 2,750 rpm
119