New Front Toe-In & Caster Specifications/Adjustment (40/2)

A. REVISED TOE-IN ADJUSTMENT OF FRONT WHEELS MODEL 107,116, 123,126 AND 201

Toe-in is the wheel alignment measurement indicating the amount that the front wheels point inward (or outward in the case of toe-out) in the direction of travel. The purpose of toe-in is to ensure parallel rolling of the front wheels, to stabilize steering, and to prevent excessive tire wear. The toe-in on the front wheels serves to offset the small deflections in the wheel-support system, which occur when the car is moving forward. In other words, even though the wheels are set to toe-in slightly when the car is standing still, they tend to roll parallel on the road when the car is moving forward. Incorrect adjustment of the toe will cause uneven tire wear or pulling to one side.

Revised toe-in specifications are shown in Table 1:

It is mandatory that the toe-in be measured with the wheels in the straight-ahead position and the front part of the wheels pushed apart. For this purpose, a new wheel tensioner is now available. The Work Instructions detail the use of this tool and the procedure for adjusting toe-in.

SPECIAL TOOLS

B. REVISED CASTER ANGLE - MODEL 126

The revised caster angle for model 126 is shown in the table below:

A. BALL POINT POSITION OF PITMAN ARM/INTERMEDIATE ARM

1. The correct toe-in setting, caster and camber angle, and ball point position of the pitman and intermediate (idler) arms are critical factors for tire wear and accurate tracking (especially for series 70 tires). When adjusting, always use nominal values.
2. The ball point position of the steering linkage exerts conside- rable influence on wheel alignment while driving. Therefore, the specified values must be strictly adhered to, with the least possible height difference between the pitman arm and idler arm all joints.

Adjusting shims are available for the intermediate (idler) arm, if required:

B. REVISED TOE ADJUSTMENT OF FRONT WHEELS

1. To measure or adjust the toe-in, the front wheels must be pushed apart using the wheel tensioner (030, Fig 1 ). By pushing the wheels apart (as shown in Fig 1 ), slack in the steering linkage is eliminated. This simulates the wheel position during normal driving.
   Fig 1: Pushing Front Wheels Apart Using the Wheel Tensioner

   
2. To measure or adjust the toe-in, the wheels must be in the straight-ahead position. For this purpose, remove the closing plug on the bottom of the power steering gear and lock the piston by inserting the center position control screw.