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STEERING
•
SYSTEM SERVICE DIAGNOSIS (CONT'D)
C O N D I T I O N
POSSIBLE C A U S E
CORRECTION
FOAMING MILKY
POWER STEERING
FLUID, LOW FLUID
LEVEL AND
POSSIBLE LOW
PRESSURE
LOW PRESSURE DUE
TO STEERING PUMP
LOW PRESSURE DUE
TO STEERING GEAR
(1)
Air in the fluid, and loss of fluid due to
internal pump leakage causing overflow.
(1)
Flow control valve stuck or inoperative.
(2)
Pressure plate not flat against cam ring.
(1)
Pressure loss in cylinder due to worn piston
ring or badly worn housing bore.
(2)
Leakage at valve rings, valve body-to-
worm seal.
(1)
Check for leak and correct. Bleed system.
Extremely cold temperatures will cause
system aeriation should the oil level be
low. If oil level is correct and pump still
foams, remove pump from vehicle and
separate reservoir from housing. Check
welsh plug and housing for cracks. If
plug is loose or housing is cracked,
replace housing.
(1)
Remove burrs or dirt or replace. Flush
system.
(2) Correct.
(1)
Remove gear from car for disassembly
and inspection of ring and housing bore.
(2)
Remove gear from car for disassembly
and replace seals.
J8919-25
FLUID
LEAKAGE-DETECTION
I n a d d i t i o n to t h e following procedure, a "black
l i g h t " detection device can be used to locate power
steering f l u i d leakage. The dye m u s t be installed and
mixed w i t h the power steering f l u i d for t h i s purpose.
CAUTION: If the fluid reservoir cap is not properly
tightened after a fluid level check, the result can be
fluid leakage and possible loss of the cap. Ensure
that the cap is securely tightened when installing it.
(1) Power steering f l u i d leakage is possible from
the f o l l o w i n g steering gear areas:
• hoses a n d f i t t i n g s ;
• " p r e l o a d " torque adjustment cap seal;
• stub shaft seals;
• housing b a l l p l u g ;
• p i t m a n shaft cover, gasket, adjustment screw and
locknut;
• p i t m a n shaft seals;
• housing end-plug seal; and
• cracked or porous housing.
(2) Raise and support t h e f r o n t of t h e vehicle.
Clean t h e exterior surfaces of the steering gear, the
pump and reservoir, t h e hoses and the f i t t i n g s thor-
oughly.
(3) Check and correct the f l u i d level i n t h e reser-
voir. I f the reservoir is overfilled, d r a i n t h e excess
fluid
d o w n to the correct level before proceeding.
(4) Inspect for aerated ( m i l k y color)
fluid,
w h i c h
can cause an overflow from the reservoir and be mis-
t a k e n for a n actual fluid leak.
(5) Inspect and t i g h t e n a l l the hose connections a t
the steering gear and a t the pump.
(6) S t a r t the engine. Have a helper t u r n t h e steer-
i n g wheel to the left and to the r i g h t several times
w h i l e y o u search for t h e source of the
fluid
leak.
Contact t h e stops momentarily i n each direction.
Stop t h e engine when the source of the fluid leak is
located.
PITMAN SHAFT
SEAL-REPLACEMENT
(1) Raise and support the vehicle. Place t h e front
wheels i n a straight-ahead position.
(2) Disconnect the center l i n k from t h e p i t m a n
(steering) a r m .
(3) M a r k the p i t m a n (steering) a r m and the p i t m a n
shaft positions for i n s t a l l a t i o n reference and remove
the p i t m a n (steering) a r m from t h e p i t m a n shaft
w i t h a n appropriate p u l l e r tool (Fig. 23).
(4) Place a d r a i n pan under the steering gear.
(5) Remove t h e p i t m a n shaft seal r e t a i n i n g r i n g
w i t h " s n a p " r i n g pliers and remove the outer backup
washer f r o m the shaft bore.
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