Daewoo Nubira. Manual - part 228

6A – 2

I

POWER STEERING SYSTEM

DAEWOO V–121 BL4

DIAGNOSIS

POWER STEERING SYSTEM
PRESSURE TEST

Tools Required
KM–354–B Pressure Test Gauge Kit
Check the fluid pressure as follows to determine whether
the trouble is in the pump or the gear unit.

Test Procedure

1.  Check the power steering fluid level and the power

steering pump belt tension. Refer to”Checking and
Adding Fluid” in this section andSection 6B, Power
Steering Pump.

2.  Disconnect the high pressure line at the pump. Use

a small container to catch any fluid.

3.  Connect the hose of the pressure test gauge kit

KM–354–B to the power steering pressure hose
from the power steering pump.

4.  Place the gear selector lever in PARK (automatic

transaxle–equipped vehicles) or NEUTRAL (manual
transaxle–equipped vehicles). Set the parking
brake.

5.  Open the gauge valve fully.
6.  Start the engine and let it idle.
7.  Turn the steering wheel from lock to lock several

times to warm the fluid to operating temperature.

8.  Increase the engine speed to 1,500 rpm.

Notice : The power steering pump could be damaged if
the valve is fully closed for more than 5 seconds.

9.  Close the gauge valve fully, and read the pressure.

The pump pressure with the valve closed should be
between 7 088 kPa to 8 619 kPa (1,028 psi to
1,250 psi).

10.  Immediately open the gauge valve fully.

11.  Turn the steering wheel all the way to the left and

the right. If the pressure is within the specified lim-
its, the problem is not in the pump. Check the pow-
er steering gear for leaks.

POWER STEERING SYSTEM LEAK
TEST

General Procedure

Inspect the following:

S

 

The fluid reservoir for overfill.

S

 

Fluid for aeration and overflow.

S

 

The hoses for loose connections.

S

 

The torsion bar, stub shaft and adjuster seals for
leaks.

S

 

The component sealing surfaces for damage.

Important : Verify the exact point of the leak. The point
from which the fluid is dripping is not necessarily the point
at which the system is leaking. When service is required,
clean the leak area upon disassembly, replace the leaking
seal, check the component sealing surfaces for damage
and reset the torque bolt to specifications, where required.

External Leak Check

The purpose of this procedure is to pinpoint the location of
the leak. In some cases, the leak can be easily located, but
seepage–type leaks may be harder to find. To locate seep-
age leaks, use the following method:

1.  With the engine off, wipe dry the complete power

steering system.

2.  Check the power steering fluid level in the pump’s

reservoir. Adjust the fluid level as necessary. Refer
to”Checking and Adding Fluid”in this section.

Notice : Do not hold the steering wheel at a stop for any
length of time as this can damage the power steering
pump.

3.  Start the engine. Turn the steering wheel counter-

clockwise and clockwise from stop to stop several
times.

4.  Find the exact area of the leak and repair it.

POWER STEERING SYSTEM  6A – 3

DAEWOO V–121 BL4

MAINTENANCE AND REPAIR

ON–VEHICLE SERVICE

BLEEDING THE POWER STEERING
SYSTEM

If the power steering hydraulic system has been serviced,
an accurate fluid level reading cannot be obtained until the
air is bled from the system. Follow these steps to bleed the
air from the system.
1.  Turn the wheels all the way to the left and add the

power steering fluid to the MIN mark on the fluid
level indicator.

Notice : When adding fluid or making a complete fluid
change, always use DEXRON

®

–III power steering fluid.

Failure to use the proper fluid will cause hose and seal
damage and fluid leaks.
2.  Start the engine. With the engine running at fast

idle, recheck the fluid level. If necessary, add fluid
to bring the level up to the MIN mark.

3.  Bleed the system by turning the wheels from side to

side without reaching the stop at either end. Keep
the fluid level at the MIN mark. The airmust be
eliminated from the fluid before normal steering ac-
tion can be obtained.

4.  Return the wheels to the center position. Continue

running the engine for 2 to 3 minutes.

5.  Road test the car to be sure the steering functions

normally and is free from noise.

6.  Recheck the fluid level as described in steps 1 and

2. Make sure the fluid level is at the MAX mark af-
ter the system has stabilized at its normal operating
temperature. Add fluid as needed.

CHECKING AND ADDING FLUID

Notice : When adding fluid or making a complete fluid
change, always use DEXRONR

®

–III power steering fluid.

Failure to use the proper fluid will cause hose and seal
damage and fluid leaks.
1.  The power steering fluid level is indicated either by

marks on a see–through fluid reservoir or by marks
on a fluid level indicator on the fluid reservoir cap.

2.  If the fluid is warmed up to 66

°

C (150

°

F), the fluid

level should be between the MAX and MIN marks.
Add fluid as needed.

3.  If the fluid is cool, 21

°

C (70

°

F), the fluid level

should be at the MIN mark. Add fluid as needed.

6A – 4

I

POWER STEERING SYSTEM

DAEWOO V–121 BL4

FLUID RESERVOIR

Removal Procedure

1.  Siphon the power steering fluid from the fluid reser-

voir.

2.  Remove the air cleaner housing and the hose.

3.  Loosen the hose clamps and remove both hoses

from the fluid reservoir.

4.  Remove the fluid reservoir by sliding it off the fluid

reservoir bracket.

POWER STEERING SYSTEM  6A – 5

DAEWOO V–121 BL4

Installation Procedure

1.  Attach the fluid reservoir to the fluid reservoir brack-

et.

2.  Connect both hoses to the fluid reservoir and se-

cure the hose clamps.

3.  Install the air cleaner housing and the hose.

Notice : Notice: When adding fluid or making a complete
change, always use DEXRONR

®

–III power steering fluid.

Failure to use the proper fluid will cause hose and seal
damage and fluid leaks.

4.  Fill the fluid reservoir with power steering fluid.
5.  Inspect for leaks. If there are leaks, correct the

cause of the leaks and bleed the system. Refer
to”Bleeding the Power Steering System”in this sec-
tion.