2010 Land Rover Range Rover Sport (LS) V8-5.0L Technical Service Bulletin # TECLTB00198 Date: 090217

2010 Land Rover Range Rover Sport (LS) V8-5.0L Technical Service Bulletin # TECLTB00198 Date: 090217

Steering/Suspension - Underbody Thudding Noise

No: LTB00198

Issue: 1

Date: 17 FEB 2009

THIS BULLETIN REPLACES LS204-11

CHANGES ARE HIGHLIGHTED WITH GRAY BACKGROUND AND SHOWN WITH ASTERISKS

SECTION: 204

* Suspension 'Thud' Due to Repeated Steering Input - Dynamic Response Vehicles Only - Inspection Procedure *

AFFECTED VEHICLE RANGE

CONDITION SUMMARY:

Situation:

A customer may report a concern of an under-car 'thud' from the front or rear suspension, or an under-car 'pulse' / 'clicking' noise from the Dynamic

Response valve block or hydraulic tubing, due to repeated left / right steering inputs. In some cases, the noise may be described as similar to 'water

hammer', the noise experienced in a domestic water system when a faucet is turned off quickly.

NOTE:

Changing any of the Dynamic Response system components will not eliminate the noise. Visual inspection for problems and torque checks must be

completed.

The described noise is a characteristic of the Dynamic Response system and is generated when there is a sudden change in oil flow in the hydraulic

circuit. This is a result of a direction control valve switching in response to driving inputs. The change in flow will be accompanied by a pressure

pulse, which will be transmitted through the hydraulic and mechanical components associated with the system. The duration and amplitude of the

pulse make it audible.

There are components of the Dynamic Response and associated systems that can influence the level of the noise.

Action:

Should a customer express concern regarding the above, refer to the Inspection Procedure detailed in this bulletin to check the associated systems.

PARTS:

No parts required; information purposes only.

WARRANTY:

No warranty information provided; information purposes only. Normal warranty policy and procedures apply.

INSPECTION PROCEDURE

CHECKING FOR PROBLEMS CAUSING DYNAMIC RESPONSE SYSTEM NOISE

NOTE:

The noise will not be eliminated by replacing Dynamic Response system components. The visual inspection and torque checks detailed below must

be completed.

NOTE:

It may not be possible to achieve the same noise level on all vehicles. The amplitude of the noise will vary from vehicle to vehicle due to natural

variability, ambient and system temperature, component tolerances and Dynamic Response system hydraulic characteristics.

NOTE:

2010 Land Rover Range Rover Sport (LS) V8-5.0L Page 263

Following inspections below, if no problems are found, it is likely that there is no fault with the system and the noise generated is simply the

characteristic of the system. The customer may be informed of the noise characteristics generated by a hydraulic system pressure pulse.

1. Ensure that all Dynamic Response system connections are secure and problem free.

2. Inspect other vehicle components for any of the following conditions that could exaggerate the noise:

^ Steering linkage integrity and securing torque.

^ Stabilizer bar linkage integrity and securing torque.

^ Stabilizer bar linkage damage or contact to other components.

^ Stabilizer bar bushing and bushing clamp integrity and securing torque.

3. Inspect the Dynamic Response system components for any of the following conditions:

^ Pipe work damage or potential contact with the body or chassis.

^ Pipe work mounting clamp integrity and isolation.

^ Hydraulic valve block damage or potential contact with the chassis.