Subaru Legacy IV (2008 year). Manual - part 669

4AT-24

General Description

AUTOMATIC TRANSMISSION

28399SA010

OIL SEAL 
PROTECTOR

Used for installing the axle shaft.

18675AA000

DIFFERENTIAL 
SIDE OIL SEAL 
INSTALLER

Used for installing the differential side retainer oil 
seal.

398497701

SEAT

Used for installing the needle bearing.

899524100

PULLER SET

Use only the bolt.
• Used together with PULLER SET 
(499737100).
• Used together with PULLER (499737000).

1. Puller
2. Cap

499247300

INSTALLER

Used for installing the oil pump housing retainer 
oil seal.

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

ST28399SA010

ST18675AA000

ST-398497701

ST-899524100

(1)

(2)

ST-499247300

4AT-25

General Description

AUTOMATIC TRANSMISSION

2. GENERAL TOOL

398791600

REMOVER

Used for removing the shifter arm spring pin.

1B022XU0

SUBARU SELECT 
MONITOR III KIT

Used for troubleshooting the electrical system.

TOOL NAME

REMARKS

Depth gauge

Used for measuring the transmission end play.

Thickness gauge

Used for measuring clearance of the clutch, brake and oil pump.

Micrometer

Used for measuring thickness of the drive pinion.

Spring scale

Used for measuring the starting torque of the drive pinion.

Circuit tester

Used for measuring resistance and voltage.

TORX

®

 T70

Used for removing and installing differential gear oil drain plug.

Push/pull gauge

Used for measuring the piston stroke of each clutch.

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

ST-398791600

ST1B022XU0

4AT-26

Automatic Transmission Fluid

AUTOMATIC TRANSMISSION

2. Automatic Transmission Fluid

A: INSPECTION

NOTE:
The level of ATF varies with fluid temperature. Pay
attention to the ATF temperature when checking
ATF level.
1) Raise the ATF temperature by driving a distance
of 5 — 10 km (3 — 6 miles). Otherwise, idle the en-
gine to raise ATF temperature to 70 — 80°C (158
— 176°F) on Subaru Select Monitor. <Ref. to
4AT(diag)-17, READ CURRENT DATA, OPERA-
TION, Subaru Select Monitor.>
2) Park the vehicle on a level surface.
3) After selecting all positions (P, R, N, D), set the
select lever in “P” range. Idle the engine for 1 or 2
minutes, and measure the ATF level.

4) Make sure that the ATF level is higher than mid
level between the upper and lower marks of the
HOT side. If the fluid level is below the lower mark,
check the transmission for leaks. If there are leaks,
it is necessary to repair or replace gaskets, oil
seals, plugs or other parts.
5) If the ATF level is below the center point be-
tween upper and lower level marks, add the recom-
mended ATF until the fluid level is above the center
point between the upper and lower level marks.

CAUTION:
• Be careful not to exceed the upper level.
• Be wary of the ATF level when filling. If the
ATF is filled to the upper level while the trans-
mission is cold, it is in an overfilled condition
and the oil will over flow.
6) Check ATF level after raising ATF temperature
to 70 — 80°C (158 — 176°F) by running the vehicle
again or by idling the engine.

B: REPLACEMENT

1) Lift up the vehicle.
2) Remove the drain plug (ATF) and completely
drain the ATF.

CAUTION:
Directly after the vehicle has been running or
the engine has been long idle running, the ATF
is hot. Be careful not to burn yourself.
3) Check the ATF condition. <Ref. to 4AT-27,
CONDITION CHECK, Automatic Transmission
Fluid.>
4) Perform replacement with a new gasket, and
tighten the drain plug (ATF).

Tightening torque:

25 N·m (2.5 kgf-m, 18.4 ft-lb)

5) Lower the vehicle.
6) Pour ATF from the oil charge pipe.

Recommended fluid:

<Ref. to 4AT-3, HYDRAULIC CONTROL AND 
LUBRICATION, SPECIFICATION, General De-
scription.>

CAUTION:
Be sure to use the recommended or equivalent
ATF. Using material except recommended one
or substitute would cause trouble.

Capacity:

Fill with the same amount of ATF that was 
drained from drain plug hole.

Capacity when transmission is overhauled:

9.3 — 9.6 

2

 (9.8 — 10.1 US qt, 8.2 — 8.4 Imp qt)

7) Bleed the air of control valve. <Ref. to 4AT-59,
Air Bleeding of Control Valve.>
8) Check the level and leaks of ATF. <Ref. to 4AT-
26, INSPECTION, Automatic Transmission Fluid.>

(A) ATF level gauge

(B) Upper level

(C) Lower level

AT-01323

COLD

LF

HOT

LF

(C)

(C)

(B)

(B)

(A)

(A) Oil pan

(B) Drain plug (ATF)

AT-04829

(B)

(A)

4AT-27

Automatic Transmission Fluid

AUTOMATIC TRANSMISSION

C: CONDITION CHECK

NOTE:
When replacing ATF, check the inside condition of transmission body by inspecting the drained ATF.

Fluid condition

Trouble and possible cause

Corrective action

Large amount of metallic pieces are 
found.

Excessive wear of the internal of the trans-
mission body.

Replace ATF and check if AT operates 
correctly.

Thick and varnish-form fluid.

Burned clutch, etc.

Replace ATF and check the AT body or 
vehicle for faulty.

Clouded fluid or bubbles are found in 
fluid.

Water mixed in fluid.

Replace ATF and check the water enter-
ing point.