Subaru 2009 IMPREZA, Service Manual

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PS-33
Steering Gearbox
POWER ASSISTED SYSTEM (POWER STEERING)
E: INSPECTION
1. BASIC INSPECTION
1) Clean all the disassembled parts, and check for wear, damage or any other faults, then repair or replace
as necessary.
2) When disassembling, check the inside of gearbox for water. If any water is found, carefully check the boot
for damage, input shaft dust seal, adjusting screw and boot clips for poor sealing. If faulty, replace with new
parts.
No. Parts Inspection Corrective action
1 Input shaft
(1) Bent input shaft
(2) Damage on serration If the bend or damage is excessive, replace the entire
gearbox.
2 Dust seal
(1) Crack or damage
(2) Wear If the outer wall slips, the lip is worn out or damage is
found, replace it with a new part.
3 Rack & pinion Poor mating of rack with pinion
(1) Adjust the backlash properly.
By measuring the turning torque of the gearbox and
sliding resistance of rack, check if the rack & pinion
engage uniformly and smoothly with each other. (Refer
to “Service limit”.)
(2) Pull out the entire rack to allow viewing of the teeth,
and check for damage.
Even if abnormality is found in either (1) or (2), replace
the entire gearbox.
4 Gearbox unit
(1) Bending of the rack shaft
(2) Bending of the cylinder portion
(3) Crack or damage on the cast iron
portion
Replace the gearbox with a new part.
(4) Wear or damage on rack bushing
If the free play of rack shaft in radial direction is out of
the specified range, replace the gearbox with new part.
(Refer to “Service limit”.)
(5) Wear on input shaft bearing
If the free play of input shaft in radial and axial direction
is out of the specified range, replace the gearbox with a
new part. (Refer to “Service limit”.)
5 Boot Crack, damage or deterioration Replace.
6 Tie-rod
(1) Looseness of ball joint
(2) Bend of tie-rod
Replace.
7 Tie-rod end Damage or deterioration of dust seal Replace.
8 Adjusting screw spring Deterioration Replace.
9 Boot clip Deterioration Replace.
10 Sleeve Damage Replace.
11 Pipe
(1) Damage to flared surface
(2) Damage to flare nut
(3) Damage to pipe
Replace.