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Alignment Fundamentals Part One

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Presentation on theme: "Alignment Fundamentals Part One"— Presentation transcript:

1 Alignment Fundamentals Part One

2 Suspension Systems Designed to: Maintains directional stability:
provide satisfactory vehicle control acceptable driver effort Maintains directional stability: on various road surfaces all types of weather loaded and unloaded towing

3 Road Variables Road Crown Bumps & Pot Holes
Crosswinds & Cross winds created by other vehicles Road surfaces Side forces Drive axle forces Suspension part movement

4 Rear Wheel Alignment & Vehicle Tracking
Thrust Line – Imaginary 90 degree angle to the centerline of the rear wheels Rear Wheel Offset – axle asm out of position, not parallel to centerline

5 Improper Thrust Angle

6 Wheel Base The distance between the center of the front & rear wheels

7 Tracking Position of the rear wheels in relationship to the front

8 Ride Height The distance between the frame & the ground. If distance varied over ¼” between sides, handling can be affected.

9 Camber Fundamentals Inward/outward tilt of wheel from true vertical.
Vehicle will pull to side most positive. Affects tire wear.

10 Camber Fundamentals Negative Camber Positive Camber

11 Jounce & Rebound Jounce - Upward wheel movement
Rebound – Downward wheel movement

12 Caster Fundamentals Tilt of a line that intersects the lower and upper ball joints (strut mount) in relation to true vertical

13 Caster Fundamentals

14 Positive Caster Helps return to straight ahead position
Increases steering effort, the wheels try to stay straight Pos caster helps maintain directional stability Too much affects steering, rapid wheel return Pulls to side with the most pos caster.

15 Negative Caster Decreases directional stability
Reduces steering effort

16 Tire Wear Caster has effect on tire wear

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