Presentation on theme: "Alignment Fundamentals Part One. Suspension Systems Designed to: –provide satisfactory vehicle control – acceptable driver effort Maintains directional."— Presentation transcript:
Alignment Fundamentals Part One
Suspension Systems Designed to: –provide satisfactory vehicle control – acceptable driver effort Maintains directional stability: – on various road surfaces – all types of weather – loaded and unloaded – towing
Road Variables Road Crown Bumps & Pot Holes Crosswinds & Cross winds created by other vehicles Road surfaces Side forces Drive axle forces Suspension part movement
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
Improper Thrust Angle
Wheel Base The distance between the center of the front & rear wheels
Tracking Position of the rear wheels in relationship to the front
Ride Height The distance between the frame & the ground. If distance varied over ¼” between sides, handling can be affected.
Camber Fundamentals Inward/outward tilt of wheel from true vertical. Vehicle will pull to side most positive. Affects tire wear.
Jounce & Rebound Jounce - Upward wheel movement Rebound – Downward wheel movement
Caster Fundamentals Tilt of a line that intersects the lower and upper ball joints (strut mount) in relation to true vertical
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.