engine SUBARU LEGACY 1995 Service Repair Manual

Symptom and possible cause Remedy
4. Broken differential (case, gear, bearing, etc.)
Abnormal noise will develop and finally it will become impossible to continue to run due to broken pieces obstructing the gear
revolution.
(a) Insufficient or improper oil Disassemble differential and replace broken components and
at the same time check other components for any trouble,
and replace if necessary.
(b) Use of vehicle under severe conditions such as excessive
load and improper use of clutchReadjust bearing preload and backlash and face contact of
gears.
(c) Improper adjustment of taper roller bearing Adjust.
(d) Improper adjustment of drive pinion and hypoid driven
gearAdjust.
(e) Excessive backlash due to worn differential side gear,
washer or differential pinionAdd recommended oil to specified level. Do not use vehicle
under severe operating conditions.
(f) Loose hypoid driven gear clamping bolts Tighten.
5. Differential and hypoid gear noises
Troubles of the differential and hypoid gear always appear as noise problems. Therefore noise is the first indication of the
trouble. However noises from the engine, muffler, tire, exhaust gas, bearing, body, etc. are easily mistaken for the differential
noise. Pay special attention to the hypoid gear noise because it is easily confused with other gear noises. There are the
following four kinds of noises.
(1) Gear noise when driving: If noise increases as vehicle speed increases it may be due to insufficient gear oil, incorrect
gear engagement, damaged gears, etc.
(2) Gear noise when coasting: Damaged gears due to maladjusted bearings and incorrect shim adjustment
(3) Bearing noise when driving or when coasting: Cracked, broken or damaged bearings
(4) Noise which mainly occurs when turning: Unusual noise from differential side gear, differential pinion, differential pinion
shaft, etc.
(a) Insufficient oil Lubricate.
(b) Improper adjustment of hypoid driven gear and drive
pinionCheck tooth contact.
(c) Worn teeth of hypoid driven gear and drive pinion Replace as a set.
Readjust bearing preload.
(d) Loose roller bearing Readjust hypoid driven gear to drive pinion backlash and
check tooth contact.
(e) Distorted hypoid driven gear or differential case Replace.
(f) Worn washer and differential pinion shaft Replace.
70
3-1DIAGNOSTICS
1. Manual Transmission and Differential

1. Automatic Transmission and
Differential
A: SPECIFICATIONS
Torque
converter
clutchTypeSymmetric, 3 element, single stage, 2 phase torque converter
clutch coupling
Stall torque ratio 2.1 — 2.3
Nominal diameter 236 mm (9.29 in)
Stall speed (at sea level) 2,300 — 2,700 rpm
One-way clutch Sprague type one-way clutch
Automatic
transmis-
sionTransmis-
sionType 4-forward, 1-reverse, double-row planetary gears
Control elementMulti-plate clutch 4 sets
Multi-plate brake 1 set
Band brake 1 set
One-way clutch (sprague type) 2 sets
Gear ratio1st 2.785
2nd 1.545
3rd 1.000
4th 0.694
Reverse 2.272
Tooth number of planetary gearFront sun gear 33
Front pinion 21
Front internal gear 75
Rear sun gear 42
Rear pinion 17
Rear internal gear 75
Selector positionP (Park)Transmission in neutral, output
member immovable, and engine
start possible
R (Reverse)Transmission in reverse for
backing
N (Neutral)Transmission in neutral, and
engine start possible
D (Drive)Automatic gear change
1st
+
,2nd+
,3rd+
,4th
3 (3rd)Automatic gear change
1st
+
,2nd+
,3rd+4th
2 (2nd)2nd gear locked
(Deceleration possible
4th,3rd,2nd)
1 (1st)1st gear locked
(Deceleration possible
4th,3rd,2nd,1st)
Control method Hydraulic remote control
2
3-2SPECIFICATIONS AND SERVICE DATA
1. Automatic Transmission and Differential

Automatic
transmis-
sionOil pumpType Variable-capacity type vane pump
Driving method Driven by engine
Number of vanes 9 pieces
Hydraulic
controlTypeElectronic/hydraulic control
[Four forward speed changes by electrical signals
of car speed and accelerator (throttle) opening]
Fluid Dexron II type Automatic transmission fluid
Fluid capacity 7.9(8.4 US qt, 7.0 Imp qt)
LubricationLubrication system Forced feed lubrication with oil pump
Oil Automatic transmission fluid (above mentioned.)
Cooling Cooling system Liquid-cooled cooler incorporated in radiator
HarnessInhibitor switch 12 poles
Transmission harness polesFWD ... 11
AWD ... 13
TransferTransfer clutch Hydraulic multi-plate clutch
Control method Electronic, hydraulic type
LubricantThe same Automatic Transmission Fluid used in
automatic transmission.
1st reduction gear ratio 1.000 (53/53)
Final
reductionFinal gear
ratioFront driveFWD 3.900 (39/10)
AWD 4.111 (37/9)
Speedometer gear ratio 0.83 (19/23)
Lubrication oil API, GL-5
Oil
capacityFront drive 1.2(1.3 US qt, 1.1 Imp qt)
AT F
cooling
systemRadiation capacity 1.651 kW (1,420 kcal/h, 5,635 BTU/h)
3
3-2SPECIFICATIONS AND SERVICE DATA
1. Automatic Transmission and Differential

G3M0854
1. Precaution
When disassembling or assembling the automatic
transmission, observe the following instructions.
1) Workshop
Provide a place that is clean and free from dust. Principally
the conventional workshop is suitable except for a dusty
place. In a workshop where grinding work, etc. which pro-
duces fine particles is done, make independent place
divided by the vinyl curtain or the equivalent.
2) Work table
The size of 1 x 1.5 m (40 x 60 in) is large enough to work,
and it is more desirable that its surface be covered with flat
plate like iron plate which is not rusted too much.
3) Cleaning of exterior
(1) Clean the exterior surface of transmission with
steam and/or kerosene prior to disassembly, however it
should be noted that vinyl tape be placed on the air
breather or oil level gauge to prevent infiltration of the
steam into the transmission and also the cleaning job
be done away from the place of disassembly and
assembly.
(2) Partial cleaning will do, depending on the extent of
disassembly (such as when disassembly is limited to
some certain parts).
4) Disassembly, assembly and cleaning
(1) Disassemble and assemble the transmission while
inspecting the parts in accordance with the Diagnostics.
(2) During job, don’t use gloves. Don’t clean the parts
with rags: Use chamois or nylon cloth.
(3) Pay special attention to the air to be used for clean-
ing. Get the moisture and the dust rid of the air as much
as possible. Be careful not to scratch or dent any part
while checking for proper operation with an air gun.
(4) Complete the job from cleaning to completion of
assembly as continuously and speedily as possible in
order to avoid occurrence of secondary troubles
caused by dust. When stopping the job unavoidably
cover the parts with clean chamois or nylon cloth to
keep them away from any dust.
(5) Use kerosene, white gasoline or the equivalent as
washing fluid. Use always new fluid for cleaning the
automatic transmission parts and never reuse. The
used fluid is usable in disassemble and assemble work
of engine and manual transmission.
(6) Although the cleaning should be done by dipping
into the washing fluid or blowing of the pressurized
washing fluid, the dipping is more desirable. (Do not rub
with a brush.) Assemble the parts immediately after the
cleaning without exposure to the air for a while. Besides
in case of washing rubber parts, perform the job quickly
not to dip them into the washing fluid for long time.
21
3-2SERVICE PROCEDURE
1. Precaution

G3M0282
2. On-Car Service
A: INSPECTION
1. ATF LEVEL
1) Raise ATF temperature to 60 to 80°C (140 to 176°F)
from 40 to 60°C (104 to 140°F) (when cold) by driving a
distance of 5 to 10 km (3 to 6 miles).
NOTE:
The level of ATF varies with fluid temperature. Pay atten-
tion to the fluid temperature when checking oil level.
2) Make sure the vehicle is level. After selecting all posi-
tions (P, R, N, D, 3, 2, 1), set the selector leveler in“P”
range. Measure fluid level with the engine idling.
NOTE:
After running, idle the engine for one or two minutes before
measurement.
3) If the fluid level is below the center between upper and
lower marks, add the recommended ATF until the fluid level
is found within the specified range (above the center
between upper and lower marks). When the transmission
is hot, the level should be above the center of upper and
lower marks, and when it is cold, the level should be found
below the center of these two marks.
CAUTION:
Use care not to exceed the upper limit level.
ATF level varies with temperature. Remember that
the addition of fluid to the upper limit mark when the
transmission is cold will result in the overfilling of
fluid.
4) Fluid temperature rising speed
By idling the engine
Time for temperature rise to 60°C (140°F) with atmo-
spheric temperature of 0°C (32°F): More than 25 minutes

Time for temperature rise to 30°C (86°F) with atmo-
spheric temperature of 0°C (32°F): Approx. 8 minutes
By running the vehicle
Time for temperature rise to 60°C (140°F) with atmo-
spheric temperature of 0°C (32°F): More than 10 minutes
5) Method for checking fluid level upon delivery or at peri-
odic inspection
Check fluid level after a warm-up run of approx. 10 min-
utes. During the warm-up period, the automatic transmis-
sion functions can also be checked.
23
3-2SERVICE PROCEDURE
2. On-Car Service

G3M0283
2. DIFFERENTIAL GEAR OIL LEVEL
1) Ensure the vehicle is in safe condition.
NOTE:
Do not check the oil level nor add oil to the case with the
front end of the vehicle jacked-up; this will result in an
incorrect reading of the oil level.
2) Check whether the oil level is between the upper (F)
and lower (L) marks. If it is below the lower limit mark, add
oil until the level reaches the upper mark.
G3M0854
3. OIL LEAKAGE
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:
Jointing portion of the case
Transmission case and oil pump housing jointing portion
Torque converter clutch case and oil pump housing joint-
ing portion
Transmission case and transmission cover jointing por-
tion (FWD)
Transmission case and extension case jointing portion
(AWD)
G3M0855
Torque converter clutch case
Engine crankshaft oil seal
Torque converter clutch impeller sleeve oil seal
ATF cooler pipe connector
Torque converter clutch
Torque converter clutch case
Axle shaft oil seal
O-ring on the outside diameter of axle shaft oil seal
holder
O-ring on the differential oil gauge
Differential oil drain plug
Speedometer cable mounting portion
Location of steel balls
24
3-2SERVICE PROCEDURE
2. On-Car Service

G3M0859
Transmission cover
Transmission cover (Defective casting)
The point listed above should be checked for fluid leak.
Checking method is as follows:
(1) Place the vehicle in the pit, and check whether the
leaking oil is ATF or not. The ATF is wine red in color,
and can be discriminated easily from engine oil and
gear oil.
(2) Wipe clean the leaking oil and dust from a suspect-
able area, using a non-inflammable organic solvent
such as carbon tetrachloride.
(3) 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. Also check
for fluid leaks while shifting select lever to“R”,“2”, and
“1”.
G3M0289
B: ADJUSTMENT
1. BRAKE BAND
If the following abnormal shifting conditions are noted in a
road test, the brake band must be adjusted.
Improper brake band clearances and their symptoms
Clearance Problem
1. Too wide Upshift from 1st directly to 3rd gear occurs.
2. WideEngine rpm increases abruptly while upshifting from 1st
to 2nd gear or 3rd to 4th gear.
Time lag of at least one second occurs during kickdown
operation from 3rd to 2nd gear.
3. Small“Braking”symptom occurs while upshifting from 2nd to 3rd
gear.
4. Too smallUpshifts from 2nd to 4th gear and downshifts from 4th to
2nd gear occur repeatedly.
26
3-2SERVICE PROCEDURE
2. On-Car Service

G3M0782
(5) Install propeller shaft.
Tightening torque:
At rear differential
23±5 N⋅m (2.3±0.5 kg-m, 16.6±3.6 ft-lb)
At center bearing
39±5 N⋅m (4.0±0.5 kg-m, 28.9±3.6 ft-lb)
NOTE:
Align matching marks on propeller shaft and rear differen-
tial coupling.
G3M0305
(6) Install front exhaust pipe
Tightening torque:
At engine
29±5 N⋅m (3.0±0.5 kg-m, 21.7±3.6 ft-lb)
At hanger
29±5 N⋅m (3.0±0.5 kg-m, 21.7±3.6 ft-lb)
At front and rear connections
18±5 N⋅m (1.8±0.5 kg-m, 13.0±3.6 ft-lb)
G3M0313
(7) Lower and remove jack.
(8) Connect the following parts:
Oxygen sensor connector
Multi-connector
G3M0304
(9) Install pitching stopper.
Tightening torque:
Body side
57±10 N⋅m (5.8±1.0 kg-m, 42±7 ft-lb)
Engine side
49±5 N⋅m (5.0±0.5 kg-m, 36.2±3.6 ft-lb)
G3M0282
(10) Replenish ATF and check oil level. Check for
leaks.
37
3-2SERVICE PROCEDURE
2. On-Car Service

3. Performance Test
A: 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 transmission
clutch.
2) To check the operation of the torque converter clutch.
3) To check engine performance.
2. TEST METHODS
Preparations before test:


1Check that throttle valve opens fully.


2Check that engine oil level is correct.


3Check that coolant level is correct.


4Check that ATF level is correct.


5Check that differential gear oil level is correct.


6Increase ATF temperature to 60 to 80°C (140 to 176°F)
by idling the engine for approximately 30 minutes (with
select 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.
3) Move the manual linkage to ensure it operates properly,
and shift the select lever to the 2 range.
B3M0286B
4) While forcibly depressing the foot brake pedal, gradu-
ally depress the accelerator pedal until the engine operates
at full throttle.
38
3-2SERVICE PROCEDURE
3. Performance Test

5) When the engine speed is stabilized, read that speed
quickly and release the accelerator pedal.
6) Shift the select lever to Neutral, and cool down the
engine by idling it for more than one minute.
7) Record the stall speed.
8) If stall speed in 2 range is higher than specifications,
forward clutch slipping on brake band slipping may occur.
To identify it, conduct the same test as above in D range.
9) Perform the stall tests with the select lever in the R
range.
CAUTION:
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 select lever set in the P or
N range and with the idle speed lower than 1,200 rpm.
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):
2200 cc 2,300 — 2,700 rpm
3. EVALUATION
Stall speed
(at sea level)Position Cause
Less than specifications2
RThrottle valve not fully open
Erroneous engine operation
Torque converter clutch’s one-way clutch slipping
Greater than specificationsDForward clutch slipping
One-way clutch (1-2) malfunctioning
RLine pressure too low
Reverse clutch slipping
Low & reverse brake slipping
2Line pressure too low
Forward clutch slipping
Brake band slipping
One-way clutch (3-4) malfunctioning
39
3-2SERVICE PROCEDURE
3. Performance Test