Front Caster Adjustment

NOTE: The vehicle should be empty and at curb weight with a full fuel tank when checking and adjusting wheel alignment. The vehicle must be checked to establish that it conforms to the Jaguar original specification, such as wheels, tires, tire pressures, etc. If a vehicle has a suspension geometry problem, all geometry settings must be investigated and corrected before making any adjustments to the caster setting.

NOTE: Adjustments to the caster will affect caster and toe in. Therefore, the caster and toe settings may need to be adjusted at the same time to achieve the correct settings. Both the left and right toe need to be adjusted when adjusting the caster.

Following the alignment equipment manufacturer's instructions, measure the suspension geometry. Contact Jaguar Technical Support for assistance if necessary. Technical Support will give advice on the course of action to be taken to rectify the problem.
Raise front of vehicle and support on stands. See JACKING & SUPPORTING under LIFTING & JACKING. Remove front wheels.
Note the position of the shims before removing the control arm bolts. Remove upper control arm bolts, collect washers and shims. See Fig 1 . Secure control arm.

NOTE: The total number of shims fitted to each control arm bolt must always remain the same, regardless of adjustment to the front and rear shim packs. No shims are to be added or removed from the control arm bolts.

Caster angle is adjusted by interchanging the shims between the front and rear arm of each wishbone. To calculate the required positioning of the shims needed to adjust the caster angle, see SHIM PACK APPLICATION table. Adjust shim pack as necessary. To:
1. Increase Positive Caster
  
  The shim thickness at the control arm location No. 1 or 3 must be decreased, and location No. 2 or 4 increased by the same amount. See Fig 2 .
2. Decrease Positive Caster
  
  The shim thickness at the control arm location No. 1 or 3 must be increased and the rear location No. 2 or 4 decreased by the same amount. See Fig 2 .
Once shim pack calculations have been made, reinstall upper control arm bolts, collect washers and shims. See Fig 1 .
Install front wheel. Tighten wheel lug nuts to specification. See TORQUE SPECIFICATIONS . Lower vehicle.
Following alignment equipment manufacturer's instructions, recheck caster setting. Repeat this procedure if necessary. Check camber and toe settings and adjust as necessary. See FRONT CAMBER ADJUSTMENTS and/or FRONT TOE-IN ADJUSTMENT .

Shim Pack Application ⁽¹⁾

Application ⁽²⁾

Contents

Shim Pack No. 1, Left Front

2 Thick, 1 Thin Shim

Shim Pack No. 2, Left Rear

1 Thin Shim

Shim Pack No. 3, Right Front

1 Thin Shim

Shim Pack No. 4, Right Rear

2 Thick, 1 Thin Shim

⁽¹⁾	Thick shim (Blue) is 0.063" (1.6mm) thick and effects caster by 0.04 degree. Thin shim (Red) is 0.035" (0.9mm) thick and effects caster by 0.2 degree. Total number of shims per control arm bolt is 2 thick and 2 thin.

⁽²⁾	For shim pack location, see Fig 2 .

Fig 1: Removing & Installing Upper Control Arm Shim Packs

Courtesy of JAGUAR CARS, INC.

Fig 2: Identifying Shim Pack Locations

Courtesy of JAGUAR CARS, INC.