Adwest power steering box-centralisation

ADWEST POWER STEERING BOX-CENTRALISATION

Model

Range Rover Discovery

Affected vehicles

All Range Rover derivatives upto VIN LH 647645 All Discovery derivatives upto VIN LJ 081991

Date

1994-03-04

Reference

04/03/94

Bulletin text

Adwest Power Steering Box - Centralisation

MODEL AFFECTED VEHICLES

Range Rover All Range Rover derivatives upto VIN LH 647645 Discovery All Discovery derivatives upto VIN LJ 081991

DETAIL

This procedure is applicable to both Range Rover and Discovery models fitted with the Adwest power steering box, when checking for steering box centralisation or when a steering box has been replaced. Failure to follow this procedure may result in a vague steering feel.

When following diagnostic procedures identified on bulletins 57/01/94 and 57/02/94 this bulletin must be followed to centralise the steering box.

ACTION REQUIRED

This procedure is to be followed when replacing or checking the centralisation of the Adwest steering box and used inconjunction with the bulletins identified above.

PARTS INFORMATION

Not applicable

PROCEDURE

Right hand drive vehicles without cruise control:

1) Disconnect the drag link. 2) Turn the steering fully onto left hand lock. 3) The orientation of the steering wheel should now be in the straight ahead position, if not, remove the steering wheel (refer to the workshop manual, section 57) whilst still on left hand lock and refit in the straight ahead position. 4) Refit the steering wheel lock washer and securing nut and tighten to a torque of 38Nm. 5) Refit the drag link. 6) Road test the vehicle.

Continued on following page.......

04/03/94

57/04/94/EN

WARRANTY

Normal warranty policy and procedures apply.

COMP. CODE

5F4A SRO Operations 1 to 2 57.10.89/26 Centralise steering wheel oo.25 hour Operations 1 to 6/7 57.10.89/27 Centralise steering box and steering wheel 00.60 hour Where applicable: 57.55.17 Drag link adjust 00.20 hour.

Adwest Power Steering Box - Centralisation

MODEL AFFECTED VEHICLES

Range Rover All Range Rover derivatives upto VIN LH 647645 Discovery All Discovery derivatives upto VIN LJ 081991

Left hand drive vehicles without cruise control:

1) Disconnect the drag link. 2) Turn the steering fully onto right hand lock. 3) The orientation of the steering wheel should now be in the straight ahead position, if not, remove the steering wheel (refer to the workshop manual, section 57) whilst still on right hand lock and refit in the straight ahead position. 4) Refit the steering wheel lock washer and securing nut and tighten to a torque of 38Nm. 5) Refit the drag link. 6) Road test the vehicle.

Right hand drive vehicles with cruise control:

1) Disconnect the drag link. 2) Turn the steering fully onto left hand lock. 3) If the steering wheel is not in the straight ahead position, initially mark the rim of the steering wheel at the 12 o'clock position and then turn the steering wheel two full turns towards right hand lock. 4) Remove the steering wheel (Refer to cruise control cassette centralising, on the following page) and refit in the straight ahead position. 5) Refit the steering wheel lock washer and securing nut and tighten to a torque of 38Nm. 6) Refit the drag link. 7) Road test the vehicle.

Left hand drive vehicles with cruise control:

1) Disconnect the drag link. 2) Turn the steering fully onto right hand lock. 3) If the steering wheel is not in the straight ahead position, initially mark the rim of the steering wheel with tape at the 12 o'clock position and then turn the steering wheel two full turns towards left hand lock. 4) Remove the steering wheel (Refer to cruise control cassette centralising, on the following page) and refit in the straight ahead position. 5) Refit the steering wheel lock washer and securing nut and tighten to a torque of 38Nm. 6) Refit the drag link. 7) Road test the vehicle.

04/02/94 57/04/94/EN

NOTE: Vehicles at the latter end of the Vin range will have a revised steering box and drop arm assembly and adjustment is different to that previously described and the following procedure should be followed:

Where a later steering box is fitted the drop arm has an 8mm recess in the rear of the forging, use an 8mm dowel rod to line the drop arm with the hole in the rear of the steering box, the rod is to be locally manufactured (Refer to the illustration below). This facility allows the steering box to be set on centre. Whilst the steering box is pegged with the dowel check to ensure the steering wheel is in the straight ahead position, should the steering wheel be off centre remove and refit to the straight ahead position. Refit the lock washer and nut and tighten to 38Nm. NOTE: Under no circumstances should the vehicle be left unattended or driven with the dowel rod inplace. Remove the dowel rod from the rear of the steering box. Road test the vehicle. If the steering wheel alignment in the straight ahead position is incorrect when driven, DO NOT REMOVE THE STEERING WHEEL, note the position of the steering wheel, return to the workshop and adjust the drag link until the steering wheel is returned to on centre position.

Continued......

Adwest Power Steering Box - Centralisation

MODEL AFFECTED VEHICLES

Range Rover All Range Rover derivatives upto VIN LH 647645 Discovery All Discovery derivatives upto VIN LJ 081991

Cruise control cassette centralising:

1) Remove the cruise control cassette from the steering column. (Refer to the Workshop Manual, section 57). Hold the cassette with the steering wheel location driving pegs upwards.

2) Hold the lower half of the cassette and rotate the upper half in an anti-clockwise direction as far as the tape inside the cassette will allow.

NOTE: To disengage the ratchet it is necessary to force the two halves of the cassette together.

CARE POINT: Do not apply excessive force when the tape limit is reached, as this may result in tape breakage.

3) Rotate the upper half of the cassette in a clockwise direction (approximately 1/4 of a turn) until the holes in the cassette upper and lower halves are aligned.

NOTE: The cassette design changed at VIN LH 452004 with the adittion of an extra alignment hole in the rear of the cassette.

Difference in design from VIN LH 452004

04/03/94 57/04/94/EN

Both holes aligned with holes in lower half from upto VIN LH 452004

Hole aligned with hole in lower half from VIN LH 452004

4) Rotate the upper half of the cassette two full turns in a clockwise direction, the mid point of the tape within the cassette is now centralised.