Файл: 92FWD_19.pdf

GENERAL INFORMATION

The power steering gear (Fig. 1) should NOT be serviced or adjusted. If a malfunction or oil leak occurs. The complete steering gear should be replaced.

If a steering gear boot needs to be replaced due to damage, refer to the power steering gear service section in this manual for proper procedure.

The power steering system consists of these four major components. Power Steering Gear, Power Steering Pump, Pressure Hose, and Return Line. Turning of the steering wheel is converted into linear travel through the meshing of the helical pinion teeth with the rack teeth. Power assist steering is provided by an open center, rotary type control valve which directs oil from the pump to either side of the integral rack piston.

Road feel is controlled by the diameter of a torsion bar which initially steers the vehicle. As required steering effort increases, as in a turn. The torsion bar twists, causing relative rotary motion between the rotary valve body and the valve spool. This movement directs oil behind the integral rack piston, which, in turn, builds up hydraulic pressure and assists in the turning effort.

The drive tangs on the pinion of the power steering pump mate loosely with a stub shaft. This is to permit manual steering control to be maintained if the drive belt on the power steering pump should break. However, under these conditions, steering effort will be increased.

STEERING GEAR SERVICE

The power steering gear should NOT be serviced or adjusted. If a malfunction or oil leak occurs. The complete steering gear should be replaced.

REMOVAL

(1)Raise vehicle See Hoisting, Group 0. Put oil drain pan under vehicle to catch power steering fluid.

(2)Remove front road wheels.

(3)Remove both tie rod ends from steering knuckles, using Puller Special Tool C-3894-A (Fig. 1).

(4)Disconnect engine damper strut from crossmember (if so equipped).

(5)Remove the 3 front suspension crossmember attaching bolts and the nut (Fig. 2) from the locating stud. Lower front suspension crossmember, using

Fig. 1 Tie Rod End Removal

transmission jack, so that the steering gear can be disconnected from the steering column.

(6)Remove fluid tubes (Fig. 3) from the power steering pump to the steering gear. See hose removal procedure.

(7)Remove the 4 bolts (Fig. 3) attaching steering gear to front suspension crossmember.

(8)Remove steering gear assembly from crossmem-

ber.

Fig. 2 Crossmember Remove/Replace

INSTALLATION

An assistant will be required in the vehicle, at the time of steering gear replacement. To help guide the steering column coupling onto the steering gear assembly.

(1)Install steering gear assembly on the front crossmember. Install the 4 steering gear to front crossmember mounting bolts (Fig. 3).

(2)Using a transmission jack raise the front crossmember and steering gear against the frame rails. Install the 3 crossmember to frame rail attaching

bolts and nut on locating stud (Fig. 2). The right rear crossmember stud is a pilot that correctly locates the crossmember. Tighten down this bolt first, then torque all 4 crossmember fasteners to 122 NIm (90 ft. lbs.).

CAUTION: Proper torque on the crossmember to frame rail mounting bolts is very important.

(3)Torque the 4 bolts (Fig. 3) attaching the steering gear assembly to front crossmember, to 68 NIm (50 ft. lbs.). To ensure proper alignment of the steering gear tighten left front bolt first.

(4)Attach the engine damper strut from the engine to the crossmember (if so equipped).

(5)Attach the fluid tubes (Fig. 3) from the power steering pump to the fittings on the steering gear.

Torque the fluid pressure line to steering gear tube nut to 31 NIm (275 in. lbs.).

(6)Mount the outer tie rod ends to the steering knuckles. Install the tie rod end to steering knuckle

attaching nuts. Torque the tie rod end to steering knuckle nuts to 52 NIm (38 ft. lbs.). Install cotter pin in tie rod end.

(7)Install the front tire and wheel assemblies on

vehicle. Install the wheel lug nuts and torque to 129 NIm (95 ft. lbs.).

(8)Lower vehicle.

CAUTION: Do not use automatic transmission fluid.

(9) Start engine and turn steering wheel several times from stop to stop to bleed air from fluid in system. Stop engine, check fluid level, and inspect system for leaks. Fill pump reservoir to correct level with Mopart, Power Steering Fluid, or equivalent. See Checking Fluid Level.

(8) Adjust toe (Refer to Group 2 Suspension).

OUTER TIE ROD

REMOVAL

(1) Loosen inner tie rod to outer tie rod jam nut (Fig. 1).

Fig. 1 Outer Tie Rod

(2) Remove outer tie rod to steering knuckle cotter pin and attaching nut (Fig. 1).

(4) Remove the tie rod end from steering knuckles, using Puller Special Tool C-3894-A (Fig. 2).

Fig. 2 Tie Rod End Removal

(5) Remove outer tie rod from inner tie rod.

INSTALLATION

(1)Install outer tie rod onto inner tie rod. Make sure jam nut is on inner tie rod (Fig. 1).

(2)Do not tighten jam nut.

(3)Install outer tie rod onto steering knuckle. In-

stall tie rod to steering knuckle attaching nut and torque to 52 NIm (38 ft.lbs.).

CAUTION: During this procedure do not allow the steering gear boot to become twisted. (See Wheel Alignment in the suspension section of this service manual).

(4)Make toe adjustment by turning inner tie rod.

(5)Tighten the inner to outer tie rod jam nut to 75 NIm (55 ft. lbs.) torque. Lubricate tie rod boot groove with silicone type lubricant before installing outer boot clamp, making sure boot is not twisted.

STEERING GEAR BOOT SEAL

The removal and installation of the following components must be performed with the rack and pinion assembly removed from the vehicle.

REMOVAL

(1)Remove outer tie rod from steering knuckle (Fig. 1).

(2)Loosen the inner to outer tie rod jam nut (Fig. 2). Remove the outer tie rod from the inner tie rod.

(3)Remove jam nut.

Ä

(4)Using pliers expand outer boot, to tie rod clamp (Fig. 3) and remove from steering gear boot.

(5)Use pliers to expand boot snorkel clamp (Fig. 3) and slide clamp off boot and leave on breather tube.

(6)Remove inner, boot to steering gear clamp (Fig.

3).

After removing inner boot clamps. Use a very small screwdriver to lift boot from its retaining groove in steering gear. Then the boot can be removed from steering gear.

Fig. 3 Boot Seal Remove Install

INSTALLATION

(1) Install boot seal on inner tie rod.

STEERING 19 - 27

(2)Align vent hole in boot seal (Fig. 3) with steering gear breather tube.

(3)Install boot seal over steering gear housing lip and onto the end of the breather tube (Fig. 3).

(4)Install boot seal to breather tube snorkel clamp (Fig. 3)

(5)Install new inner boot seal to steering gear clamp (Fig. 3)

(6)Lubricate inner tie rod boot groove with silicone type lubricant, then install outer boot seal to inner tie rod clamp (Fig. 3).

(Clamp will have to be loosened for toe adjustment.)

(7)Install inner to outer tie rod jam nut (Fig. 2) on inner tie rod.

(8)Install outer tie rod on inner tie rod (Fig. 2). Do not tighten jam nut.

(9)Install outer tie rod onto steering knuckle. In-

stall tie rod to steering knuckle attaching nut and torque to 52 NIm (38 ft. lbs.).

CAUTION: During this procedure do not allow the steering gear boot to become twisted. (See Wheel Alignment in the suspension section of this service manual).

(10)Make toe adjustment by turning inner tie rod.

(11)Tighten the inner to outer tie rod jam nut to 75 NIm (55 ft. lbs.) torque. Lubricate tie rod boot groove with silicone type lubricant, before installing outer boot clamp, making sure boot is not twisted.

GENERAL INFORMATION

WARNING: THE AIR BAG SYSTEM IS A SENSITIVE, COMPLEX ELECTRO-MECHANICAL UNIT. BEFORE ATTEMPTING TO DIAGNOSE, REMOVE OR INSTALL THE AIR BAG SYSTEM COMPONENTS YOU MUST FIRST DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE. FAILURE TO DO SO COULD RESULT IN ACCIDENTAL DEPLOYMENT OF THE AIR BAG AND POSSIBLE PERSONAL INJURY.

THE FASTENERS, SCREWS, AND BOLTS, ORIGINALLY USED FOR THE AIR BAG COMPONENTS, HAVE SPECIAL COATINGS AND ARE SPECIFICALLY DESIGNED FOR THE AIR BAG SYSTEM. THEY MUST NEVER BE REPLACED WITH ANY SUBSTITUTES. ANYTIME A NEW FASTENER IS NEEDED, REPLACE WITH THE CORRECT FASTENERS PROVIDED IN THE SERVICE PACKAGE OR FASTENERS LISTED IN THE PARTS BOOKS.

BEFORE SERVICING A STEERING COLUMN EQUIPPED WITH AN AIR BAG, REFER TO GROUP 8M, ELECTRICAL FOR PROPER AND SAFE SERVICE PROCEDURES.

Safety goggles should be worn at all times when working on steering columns.

The Acustar tilt and standard column (Fig. 1) has been designed to be serviced as an assembly; less wiring, switches, shrouds, steering wheel, etc. Also, most steering column components can be serviced without removing the steering column from the vehicle.

CAUTION: Disconnect negative (ground) cable from the battery, before servicing any column component.

CAUTION: Do not attempt to remove the pivot pins to disassemble the tilting mechanism. Damage will occur.

STEERING COLUMN SERVICE PROCEDURES

To service the steering wheel and its components or the air bag, refer to Group 8M, Restraint Systems. Follow all WARNINGS.

To service the switches, refer to the appropriate section of Group 8, Electrical.

To replace the steering column assembly, refer to the steering column removal procedure. For location of components referred to in the procedure see (Fig. 1).

WARNING: BEFORE BEGINNING ANY AIR BAG SYSTEM COMPONENT INSTALLATION OR REMOVAL PROCEDURES. REMOVE AND ISOLATE THE NEGATIVE (-) BATTERY CABLE (GROUND) FROM THE VEHICLE BATTERY. THIS IS THE ONLY SURE WAY TO DISABLE THE AIR BAG SYSTEM. FAILURE TO DO THIS COULD RESULT IN ACCIDENTAL AIR BAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.