Land Rover Range Rover Technical Service Bulletin # TEC120499 Date: 990903

Engine - Whining Noise

No.: 12/04/99/NAS

Ref:

Issue: 1

Date: 09/03/99

RH Serpentine Belt Idler Pulley Noise

AFFECTED VEHICLE RANGE:

Range Rover (LP) XA410483 onwards

SITUATION:

WHINE FROM UNDER THE HOOD AT IDLE

A customer may complain of a whining noise which disappears when the engine speed is raised above approximately 1100 rpm.

The alternator may be mistakenly identified as the source of this noise.

RESOLUTION:

REPLACE AUXILIARY DRIVE SYSTEM COMPONENTS TO RESOLVE RESONANCE

On customer complaint of the whining noise, investigate the source. Upon determination that the idler pulley is at fault, replace the auxiliary drive

belt and idler pulley with the specified parts.

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PARTS INFORMATION

TOOLS REQUIRED

WARRANTY CLAIMS

Normal warranty policy and procedures apply.

REPAIR PROCEDURE

NOTE:

All vehicles have two idler pulleys. Only the pulley adjacent to the drive belt tensioner is to be replaced. That pulley is indicated with an

arrow in the illustration.

1. Refer to Figure 1 item A and verify that the idler pulley is the source of the noise.

2. Refer to Workshop Manual repair sections 26.25.19 and 86.10.03 for 99MY vehicles and disassemble the idler pulley and belt system as

follows:

^ Remove the cooling fan assembly using special tools LRT-12-093 and LRT-12-094.

^ Remove the bolts securing the drive belt cover.

^ Release the drive belt tensioner.

^ Remove and discard the used belt.

^ Remove and discard the RH idler pulley.

3. Clean all pulley grooves in all locations.

4. Inspect and verify that there is no damage to any groove in the belt pulley system.

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5. Install new idler pulley provided in kit PQZ100050.

6. Torque the idler pulley retaining bolt to 50 Nm (37 lbf.ft.).

7. Refer to WSM and install the new belt provided in kit PQZ100050.

8. Install the cooling fan assembly.

9. Verify that the noise has been eliminated as follows:

^ Start the engine and let the idle stabilize.

^ Determine that whining noise is not present.

^ Raise the engine speed gradually to 2000 RPM.

^ Allow the engine speed to stabilize at idle and remain at idle for 1 minute.

^ Verify that whining noise does not occur.

^ Repeat the elevation of engine speed up to 2000 RPM and listen for one more minute to ensure noise level is stable and whine noise has