Noise, vibration, harshness (nvh)

NOISE, VIBRATION, HARSHNESS (NVH)

Model

Discovery Range Rover Classic

Affected vehicles

All Derivatives from Range Rover Classic LH 647645 to LH 653620 Discovery LJ 081991 to LJ 103731

Date

1994-11-23

Reference

23/11/94

Bulletin text

Noise, Vibration, Harshness (NVH)

MODEL AFFECTED VEHICLES

Discovery All Derivatives from Range Rover Classic LH 647645 to Range Rover LH 653620 Discovery LJ 081991 to LJ 103731 Classic

DETAIL

Resolving noise and vibration problems can be difficult and time consuming, to assist dealers in this procedure the following supplementary list on body vibration has been complied.

This procedure complements bulletin 10/93/EN and should be used in conjunction with this earlier diagnostic tool.

ACTION REQUIRED

On customer complaint apply diagnostic procedure. Apply fix procedure only if a detailed problem is diagnosed.

PARTS INFORMATION

See following page.

PROCEDURE

Problem Description

Vibration through front seats and footwells at engine speeds of approximately 2000-2200rpm. Body noise/grunch/squeak whilst vehicle is in use. ---------------------------------------Checks/procedure to be carried out. Range Rover/ Discovery variants. *On customer complaint, confirm exact problem by road testing the vehicle. *Locate the front floor support brackets (right hand and left hand side) measure the clearance between the underside of the brackets and the top of the chassis sidemembers (see diagram A). This must be no less than 1mm. *Only if there is a foul condition between the bracket (left and right side) and the top of the sidemember, the following procedure should be applied.

23/11/94

76/33/94/EN

WARRANTY

Normal warranty policy and procedures apply

COMP. CODE

See individual complaint codes

SRO

Discovery 76.10.89/30 Check and/or dress off weld (both sides) 00.80 hours.

Range Rover and Discovery 76.10.89/31 Fit washers 00.20 hours.

Noise, Vibration, Harshness (NVH)

MODEL AFFECTED VEHICLES

Discovery All Derivatives from Range Rover Classic LH 647645 Range Rover and Discovery LJ 081991 Classic

Discovery Variants only 1) Remove front floor support brackets. 2) Inspect locally the top of the sidemember along the seam weld (inner and outer) sidemember, This area must be flat and free from weld build up, If there is evidence then dress/clean file flat the area. 3) Refit brackets and remeasure clearance. 4) Road test vehicle.

Only if a Foul Condition Remains a) Slacken off fixings securing body shell/chassis at the front outriggers only left and right side, (see diagram B). b) Displace body mounting bracket from the chassis outrigger mounting boss, sufficiently to insert a flat washer part number NZ 566580 (as shown in diagram B), this should be carried out on both left and right hand sides. c) Refit/secure fixing to correct torque figure. There must be a minimum of 3 threads showing after retorquing. If there is insufficient thread available then part number NZ 606041L (nut) can be fitted in place of the current specification, front outriggers. d) Road test vehicle. e) Repeat operations A-D if clearance is not achieved. f)Road test vehicle, If problem remains and there is clearance between refereed brackets and top of the chassis sidemembers, please report the issue immediately to Land Rover Service.

Important : On initial inspection for clearance between brackets and chassis sidemembers, if clearance is evident do not proceed with this fix procedure, in this instance proceed with service bulletin 101/93/EN.

Range Rover variants only Apply procedure a to f only.

23/11/94 76/33/94/EN

only to the left and right hand

Noise, Vibration, Harshness (NVH)

MODEL AFFECTED VEHICLES

Discovery All Derivatives from Range Rover Classic LH 647645 Range Rover and Discovery LJ 081991 Classic

Diagram B

23/11/94 76/33/94/EN