2010 JAGUAR XFR suspension

Rear Suspension - Rear Suspension - Overview
Description and Operation

OVERVIEW Published: 11-May-2011

The double wishbone type rear-suspension is a fully independent design assembled on a steel subframe; large diameter
bushes isolate the subframe from the vehicle's body.
A toe-link located between the wheel knuckle and the subframe is used to adjust the toe angle of the rear wheels.

The wheel knuckle attaches to the upper and lower control arms, and the coil spring and damper assembly is located between
the lower control arm and the vehicle body.
Dependant on vehicle model there are three types of coil spring and damper available:
a standard oil passive damper (All models except supercharged),
an adaptive damper, also known as Computer Active Technology Suspension (CATS) on 4.2L supercharged vehicles up to
2010MY, For additional information refer to Vehicle Dynamic Suspension 4.2L.
a continuously variable adaptive damper, also known as Adaptive Dynamics System on 5.0L supercharged vehicles from
2010MY. For additional information refer to Vehicle Dynamic Suspension 5.0L.

the aluminum wheel knuckle via an integral ball-joint.

Lower Control Arm

The aluminum lower arm locates to the subframe via one cross-axis joint and one plain rubber bush, and to the wheel knuckle
via a second plain rubber bush.
The rear of the control arm has mounting points for the damper and the stabilizer link.

Toe-Link

The toe-link is located between the wheel knuckle and brackets on the subframe.

The toe-link comprises an inner rod with integral axial ball joint. The inner ball joint has a threaded spigot which locates in a
bracket on the subframe and is secured with a locknut. The rod has an internal thread which accepts the outer rod.

The outer rod has a cross-axis joint at its outer end which is located in a clevis on the wheel knuckle, and is secured with a
bolt and locknut.

The length of the toe-link can be adjusted by rotating the inner rod. This allows for adjustment of the toe angle for the rear
wheel. Once set the inner rod can be locked in position by tightening a locknut on the outer rod against the inner rod.

Wheel Knuckle

The cast aluminum wheel knuckle attaches to:
the upper control arm via a ball-joint located in the arm,
the lower control arm via a plain rubber bush located in the arm,
the toe-link via a cross-axis joint located in the toe link.
The wheel knuckle also provides the mounting locations for the:
wheel hub assembly,
wheel bearing,
wheel speed sensor,
brake caliper,
and disc shield.

Stabilizer Bar

The solid construction stabilizer bar and bushes have been designed to provide particular characteristics in maintaining roll
rates, specifically in primary ride comfort. There are six derivatives of rear stabilizer bar, with different diameters, to support
the various powertrains:
V6 gasoline - 12.7 mm solid bar
V8 4.2L and 5.0L gasoline - 13.6 mm solid bar
V6 2.7L diesel -14.5 mm solid bar
V6 3.0L diesel - 14.5 mm solid bar
V6 3.0L diesel with Adaptive Damping – 16mm tubular
V8 4.2L gasoline supercharged – 16mm tubular
V8 5.0L gasoline supercharged
- SV8 - 17mm tubular
- XFR - 18mm tubular

The stabilizer bar is attached to the top of the subframe with two bushes and mounting brackets. The stabilizer bar has
crimped, 'anti-shuffle' collars pressed in position on the inside edges of the bushes. The collars prevent sideways movement of
the stabilizer bar.

Each end of the stabilizer bar curves rearward to attach to a ball joint on each stabilizer link. Each link is attached via a
second ball joint to a cast bracket on the lower control arm. The links allow the stabilizer bar to move with the wheel travel
providing maximum effectiveness.

Spring and Damper Assembly

The spring and damper assembly are attached to cast brackets on the lower control arms and to the vehicle body by four studs
secured by locking nuts. Dependant on vehicle model there are three types of coil spring and damper available:
a standard oil passive damper (All models except supercharged),
an adaptive damper, also known as Computer Active Technology Suspension (CATS) on 4.2L supercharged vehicles up to
2010MY, For additional information refer to Vehicle Dynamic Suspension 4.2L.
a continuously variable adaptive damper, also known as Adaptive Dynamics System on 5.0L supercharged vehicles from
2010MY. For additional information refer to Vehicle Dynamic Suspension 5.0L.

The dampers are a monotube design with a spring located by a circlip onto the damper tube. The lower end of the damper has
a spherical joint which locates in the lower control arm and is secured with a bolt.

The damper piston is connected to a damper rod which is sealed at its exit point from the damper body. The threaded outer
end of the damper rod locates through a hole in the top mount. A self locking nut secures the top mount to the damper rod.
The damper rod on the adaptive damper has an electrical connector on the outer end of the damper rod. www.JagDocs.com

Rear Suspension - Rear Suspension
Diagnosis and Testing

Principle of Operation Published: 22-May-2012

For a detailed description of the suspension system, refer to the relevant Description and Operation section of the workshop
manual.REFER to: (204-02 Rear Suspension)

Rear Suspension (Description and Operation), Rear Suspension (Description and Operation), Rear Suspension (Description and Operation).
Inspection and Verification

1. Verify the customer concern

2. Visually inspect for obvious signs of damage and system integrity



3. If an obvious cause for an observed or reported condition is found, correct the cause (if possible) before proceeding to
the next step
4. If the fault is not visually evident, verify the symptom and refer to the following Symptom Chart

Symptom Chart
Symptom Possible Cause Action Evidence of fluid on suspension damper
Fluid on damper from an external source
Fluid leaking from damper
Damper not faulty, do not renew
GO to Pinpoint Test A.
PINPOINT TEST A : DAMPER FLUID LEAK DIAGNOSIS TEST CONDITIONS DETAILS/RESULTS/ACTIONS A1: ASSESS LEAK NOTES:


Residual oil left over from the damper assembly process may create oil staining on the damper tube. This will not affect
the function of the damper.
Slight seepage is considered normal. 1 Assess the extent of the oil leakage Is the leakage serious enough to indicate that the damper seal has failed? Yes
GO to Pinpoint Test B. No
Damper not faulty, do not renew.
PINPOINT TEST B : CONFIRM LEAK TEST CONDITIONS DETAILS/RESULTS/ACTIONS B1: ROAD TEST 1 Clean all traces of oil from the damper 2 Drive the vehicle over a speed bump or similar ten times Is any fluid visible on the outside of the damper? Yes
GO to Pinpoint Test C. No
Damper not faulty, do not renew.
PINPOINT TEST C : DAMPER STICKOUT TEST TEST CONDITIONS DETAILS/RESULTS/ACTIONS C1: DAMPER STICKOUT TEST Mechanical

Damaged suspension dampers Visual Inspection

NOTE: If a significant quantity of fluid has leaked out of the damper, the dividing piston will be displaced upwards in the
tube by the pressure of the gas below it. This will limit the downward travel of the piston. 1 Remove the suspension strut assembly REFER to: Shock Absorber and Spring Assembly (204-02 Rear Suspension, Removal and Installation). 2 Remove the spring 3 Remove the bump stop 4 Push the damper piston fully into the damper tube

5 Measure and record the stickout dimension (the distance between the damper tube cap and the piston rod shoulder) Is the stickout dimension greater than 12.0mm?
Yes
Damper unserviceable. Install a new suspension damper.
Enclose a record of the stickout dimension with the returned
part.
No
Damper serviceable. Re-assemble and re-install the
suspension strut
REFER to: Shock Absorber and Spring Assembly (204-02 Rear Suspension, Removal and Installation).

Rear Suspension - Lower Arm
Removal and Installation Published: 11-May-2011



NOTES: Removal

Before commencing work on the vehicle ensure the park brake is in the off position.


LH shown RH similar.


1. WARNING: Make sure to support the vehicle with axle stands.
Raise the vehicle.

2. Remove the wheel and tire.
For additional information, refer to: W heel and Tire (204-04 Wheels and Tires, Removal and Installation).

3. Release the shock absorber and spring assembly from the
lower arm.















4. Release the rear stabilizer bar link. www.JagDocs.com

5. CAUTION: Do not allow the brake caliper to hang on the
brake hose.


NOTE: Make sure that new bolts are installed.
Release the rear brake caliper and tie aside.









6. Release the lower arm from the wheel hub assembly.
7. Remove the lower arm.













Installation

1. CAUTION: Nuts and bolts must be tightened with the
weight of the vehicle on the suspension.

Install the lower arm.

2. CAUTION: Nuts and bolts must be tightened with the
weight of the vehicle on the suspension.
Secure the lower arm to the wheel hub assembly.












3. CAUTION: Do not allow the brake caliper to hang on the
brake hose.


NOTE: Make sure that new bolts are installed.

Secure the rear brake caliper.
Tighten the bolts to 103 Nm.








4. Secure the rear stabilizer bar link.
Tighten the nut to 48 Nm.















5. CAUTION: Nuts and bolts must be tightened with the
weight of the vehicle on the suspension.

Secure the shock absorber and spring assembly to the lower
arm.









6. Install the wheel and tire.
For additional information, refer to: W heel and Tire (204-04 Wheels and Tires, Removal and Installation).

Interior Trim and Ornamentation, Removal and Installation).

Vehicles with active damping

2. Disconnect the active suspension damper electrical connector.













All vehicles

3. Remove the shock absorber and spring assembly top mount
nuts. TORQUE: 28 Nm













4. WARNING: Make sure to support the vehicle with axle stands.
Raise the vehicle.

5. Remove the wheel and tire.
For additional information, refer to: Wheel and Tire (204-04 Wheels and Tires, Removal and Installation).