Subaru XT 1988 Service Manual page 14

GENERAL INFORMATION
1-3
Precautions in handling a full-time 4WD vehicle
• Speedometer test
Generally, when testing the speedometer of a full-time 4WD
vehicle, even if the engine is running at a relatively slow speed,
releasing the clutch abruptly may still cause the vehicle to
jump off of the test machine. Be especially careful to avoid
this.
1) Testing Methods
(1) Jack-up Method
The usual speedometer tester is used and the rear wheels
are tested with the front wheels raised off the ground and
the center differential locked.
~
~~,
,7-::::::
; { +
! {
+
':!
L1·406
Fig.
3
Jack-up method
(2) Adapter Method
An adapter is installed between the vehicle's speedometer
and cable, and testing is done using the usual speedometer
tester with the center differential operating. The vehicle's
speedometer will then indicate 1/2 actual wheel speed.
Therefore, an adapter which doubles the speed is neces·
sary.
L1·407
Fig.
4
Adapter method
Use the adapter method only when the jack-up method cannot
be employed at the service garage.
3
2) Testing Procedures
(1) Jack-up Method
CD
Equipment
• Speedometer tester ....................... 1
• Garage jack ............................. 1
• Safety stand ............................ 2
®
Precautions
• Test the speedometer using the rear wheels.
(Vehicle stability is better than with the front
wheels.)
, - .......... - ..... i
~
/'
"
/
\:
I.
+
II
+
I I
i \ . . . . .
_..,~/
\ . . . . . . _",,/ :
L1-408
Fig.
5
Setting on the speedometer tester
• Place the garage jack and safety stands in their
proper positions.
Also, in order to prevent the vehicle from slipping
due to vibration, do not place any wooden blocks
or similar items between the safety stands and the
vehicle.
1
rAPprox.
I
80 mm 13.15 ;nl
Front
(J
L 1·360
Fig. 6 Safety stand setting
• Since the front wheels will also be rotating, do not
place anything near them. Also, make sure that
nobody goes in front of the vehicle.
• With the center differential locked, confirm that
the differential lock indicator light is lit.