Subaru Impreza 2003, Service Manual

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PS-42
POWER ASSISTED SYSTEM (POWER STEERING)
STEERING GEARBOX [LHD MODEL]
E: INSPECTION
1. BASIC INSPECTION
1) Clean all 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) Bend of 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 one.
3 Rack and pinion Poor mating of rack with pinion (1) Adjust the backlash properly.
By measuring the turning torque of gearbox and sliding
resistance of rack, check if rack and pinion engage uni-
formly and smoothly with each other. (Refer to “Service
limit”.)
(2) Keeping the rack pulled out all the way so that all
teeth emerge, check teeth for damage.
Even if abnormality is found in either (1) or (2), replace
the entire gearbox.
4 Gearbox unit (1) Bend of rack shaft
(2) Bend of cylinder portion
(3) Crack or damage on cast iron
portion Replace the gearbox with a new one.
(4) Wear or damage on rack bush If the free play of rack shaft in radial direction is out of the
specified range, replace the gearbox with a new one.
(Refer to “Service limit”.)
(5) Wear on input shaft bearing If the free plays of input shaft in radial and axial directions
are out of the specified ranges, replace the gearbox with
a new one. (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 on dust
seal Replace.
8 Adjusting screw
spring Deterioration Replace.
9 Boot clip Deterioration Replace.
10 Sleeve Damage Replace.
11 Pipes (1) Damage to flared surface
(2) Damage to flare nut
(3) Damage to pipe Replace.