Dismantling and Reassembling Power Steering Gear

Dismantling and reassembling power steering gear

- power steering gear removed -
- tie rods removed -

Caution:
When working on steering gear, always work carefully in clean conditions.
All use of force prohibited during assembly and disassembly. This can otherwise give rise to damage and culminate in failure of the steering unit.





Remove leakage oil line.
Remove pressure lines and remove O-rings from threaded bores or from lines.





1. Mark position of adjusting screw (1) relative to case with peening marks.
2. Determine installation depth of adjusting screw (1) in case with a depth gauge and note down the result.
3. Loosen adjusting screw (1).
4. Remove spring (2), O-ring (3) and pressure piece (4).





Unscrew and remove screw cap.





Centre steering gear (by halving total number of turns).
In this setting, marks on steering spindle, cap and case all match. If necessary, add marks.
Determine dimension (A) with a depth gauge and note down result. This dimension is required for inspection after assembly.





Remove protective cap (1) from steering spindle.
Unfasten nut - brace against square nut on steering spindle.





Remove circlip.
Withdraw steering spindle from case.





Remove bearing bush (1).





Drive radial shaft seal (2) and bearing (3) out of bearing bush (1) with special tool 32 1 140/250.





Remove connection for leakage oil line.





Insert retaining ring through bore in leakage oil line and remove from case.





Pull rack and bearing bush (1) out of pipe.





Drive radial shaft sea[ out of bearing bush (1) with special tool 32 1 140/210 and 33 3 331.





Drive radial shaft seal out of pipe with special tool 32 1 140/210.





Carefully drive bearing out of steering spindle housing with a punch. This improves access to radial shaft seal





Caution:
Do not damage polished cylinder bore.
Carefully drive radial shaft seal (1) out of steering spindle housing with a punch.

Thoroughly clean all parts.
Coat new seals with hydraulic fluid and fill radial shaft seals between edge and sealing lip with grease.





Replace O-ring (1).
Insert plastic bush (2) and thrust shim (3) in bearing sleeve.
Radial shaft seal (4).





Drive new radial shaft seal (4) - open side facing special tool 32 1 140/220 - firmly home in bearing bush.





Insert plastic bush (1) and thrust shim (2) in pipe.
Drive new radial shaft seal (3) - open side facing special tool 32 1 140/220 - firmly home in pipe.





Grease bearings and drive firmly home in steering spindle housing with special tool 32 1 140/120.





Drive new radial shaft seal - open side facing special tool 32 1 140/230 - firmly home in steering spindle housing.





Replace O-ring (1) and piston ring (2).





Carefully insert rack in pipe to avoid damage to:
1. the internal radial shaft seal by the spline and
2. the piston race (2).
Fit bearing bush to rack and slide into pipe.





Fit circlip with open side opposite leakage oil bore.





Replace piston rings (1) and O-rings (2) beneath them.





Insert new radial shaft seal (3) - open side upwards - in bearing bush (1) and drive firmly home with special tool 32 1 140 /240 /250.
Replace O-ring (2).





Drive bearing (2) firmly home - lettering upwards - into bearing bush (1) with special tool 32 1 140 /240 /250.





Slide bearing bush (1) - radial shaft seal outermost -onto the steering spindle.





Grease rack and pinion, use BMW approved grease or equivalent.
Pull out rack to recorded dimension (A).
Carefully insert steering spindle into case and install retaining ring.
Check that marks are aligned.





Push on protective cap in this position , whereby marking of housing, steering spindle and protective cap must align.





Replace self-locking nut and tighten down to Tightening torque = 17 Nm.





Tighten screw cap to Tightening torque = 32 Nm and secure by peening.





Replace film insert (1) and O-ring (2).





Grease and install pressure piece (4), spring (2) and O-ring (3).
Tighten adjusting screw (1) down to determined screw-in depth and align all the marks.
Secure adjusting screw by peening.

Caution: Rack must be able to move freely across entire range travel.





Fit connections for leakage oil line.
Fit leakage oil line and attach pressure lines with new O-rings.
Tightening torque = 8 Nm.