Subaru 1600 Service Manual page 327

AUTOMATIC TRANSMISSION AND DIFFERENTIAL
• Inspection and replacement interval
Every 12,000 km
Inspection
(7,500 miles) or
7.5 months
Every 48,000 km
Replacement
(30,000 miles) or
30 months
• Replacement of oil
Remove the drain plug located on
the left side of the final reduction
case, and drain the oil completely.
Tighten the plug to a torque of
25 N·m (2.5 kg-m, 18 ft-lb), and
remove the oil gauge, and pour new
oil into the case through the open-
ing until the oil level reaches the
upper level mark [total quantity of
oil: 1.2Q (1.3 US qt, 1.1 Imp qt»).
2) Oil Leakage Check Points
It is difficult to accurately determine
the precise position of a oil leak, since
the surrounding area also becomes wet
with oil. The places where oil seals and
gaskets are used are as follows:
1) Jointing portion of the case
• Transmission case and final reduc-
tion case jointing portion
• Final reduction case and converter
housing jointing portion
• Transmission case and transmission.
cover (or intermediate case)
jointing portion
• Intermediate case and extension
case jointing portion
2) Converter housing
• Engine crankshaft oil seal
• Torque converter impeller sleeve oil
seal
• A TF pipe connector
3) Final reduction case
• Final reduction case and governor
cover
• Axle shaft oil seal
• O-ring on the outside diameter of
axle shaft oil seal holder
• Differential oil fIller port
• Differential oil drain plug
• Speedometer cable mounting por-
tion
• Governor test plug
• Air breather
4) Automatic transmission case
• Mating surface of oil pan and trans-
mission case
• O-ring on the outer diameter of
servo piston cover
• Test plug (Servo connecting side
and servo release side)
• Oil supply pipe connections
• ATF pipe connector
• Vacuum diaphragm location
• Downshift solenoid location
• O-ring on the outer diameter of
servo adjusting screw
• Oil pan drain plug
• Governor pressure and line pressure
checking blind plugs (steel ball)
5) Intermediate case
• Test plugs (two plugs for line pres-
sure, and plugs on forward clutch,
reverse clutch, and transfer clutch)
• Blind plug (steel ball)
6) Extension
• Rear drive shaft oil seal
• Transfer solenoid location
• Thermoswitch location
The points listed above should be
checked for fluid leak. Checking
method is as follows:
• Place the vehicle in the pit, and
check whether the leaking oil is
ATF or not. The A TF is wine red
in color, and can be discriminated
easily from engine oil and gear oil.
• Wipe clean the leaking oil and dust
from a suspectable area, using a
noninflammable organic solvent
such as carbon tetrachloride.
• Run the engine to raise the fluid
temperature, and set the selector
lever to "D" in order to increase
the fluid pressure and quickly
detect a leaking point.
3) Checking the Engine Idling
rpm
Excessively low engine idling rpm will
lead to rough engine operation and
excessively high idling rpm will lead to
a sudden shift shock or creeping when
shifting from N to D or R.
7-32
Idling rpm for
automatic
transmission cars
(N or Prange)
800
±
100 rpm
4) Checking and Adjusting the
Kickdown Switch and
Downshift Solenoid
Set the ignition switch to ON, and
fully depress the accelerator pedal to
see whether the solenoid functions or
not. If no kickdown occurs, or if the
shift point occurs with the throttle
half open, check the kickdown switch,
downshift solenoid and associated
wires. If kickdown failure occurs in-
frequently, it may be due to malfunc-
tion of the solenoid contaminated
with dirt. Wash the inside of solenoid
while moving the push rod. After
washing, carefully check the operation
of the solenoid.
NOTE:
Before removing or installing the sole-
noid, drain approx. 2
Q
(2.1 US qt, 1.8
Imp qt) of ATF.
5) Checking Negative Intake
Pressure
Check whether pressure is over -60.0
kPa (-450mmHg, -17.72inHg) at
idling speed of engine, and whether
pressure decreases in proportion to
increase of engine speed when acceler-
ator pedal is depressed.
6) Checking Creeping
Check whether car exhibits a certain
amount of creeping when it is brought
to a temporary stop with selector lever
in "D", "2", "1" or "R" position.
7) Checking and Adjusting the
Manual Linkage
Adjustment of the manual linkage, like
the inspection of fluid level, is an
important operation in the automatic
transmission service. Remember that
improper adjustment may lead to a
damaged transmission.