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Vehicle Alignment CDX Diesel Steering and Suspension Module 11: Vehicle Alignment  TerMS And defInITIonS  Toe-In And Toe-ouT  PurPoSeS of WheeL ALIgnMenT  MAxIMuM TurnIng AngLe  requIred TIMeS To PerforM fronT WheeL  TurnIng rAdIuS AngLe ALIgnMenT  AxLe ALIgnMenT  CAMBer  PInIon AngLe AdJuSTMenT  KIngPIn InCLInATIon (KPI)  MInor fronT WheeL ALIgnMenTS  CASTer  MAJor fronT WheeL ALIgnMenTS Terms and Definitions ready for review Alignment refers to the adjustments made in the Thrust is the force that moves an object forward. relationship between axles, steering and suspension Thrust angle is the angle between thrust lines and components, and tires to bring them into correct the vehicle’s centerline. positions. Thrust lines are marks or tracks that indicate forward Camber is the inward or outward tilt of the top of the movement of the rear wheels; they should be parallel tires when viewed from the front of the vehicle. to the vehicle’s centerline. Caster is the forward or rearward tilt of the kingpin Toe is the angle of the tires from the true straight- centerline when viewed from the side of the vehicle. ahead position when viewed from the top of the Kingpin inclination (KPI) is the angle measured vehicle. between the centerline of the kingpin and the vertical Turning radius angle is the characteristic angle built position as viewed from the front of the vehicle. into the steering linkage by the manufacturer to allow Maximum turning angle is the degree of movement for the different radii used by the front wheels during from a straight-ahead position of the front wheels a turn. to either an extreme right or left position, which is Note: Because the inner wheel of a vehicle must follow a adjusted by stop screws on the steering knuckle. smaller circle than the outer wheel, the inner and outer The Pythagorean theorem refers to the geometric wheels must turn at different angles, and this is some- formula that applies only to right (90˚) triangles: times referred to as the steering geometry or Ackermann A2 + B2 = C2. angle. Scrubbing is the condition of tires subjected to extreme friction, especially from misalignment. Purposes of Wheel Alignment ready for review There are four primary purposes of wheel alignment: 3. To maintain steering handling. 1. To correct steering and tire wear conditions. 4. To maximize life of tires and suspension parts. 2. To maintain reliable and stable steering. Required Times to Perform Front Wheel Alignment ready for review every 200,000 miles (320,000 km) or 24 months When tires are wearing rapidly or unusually. (normal maintenance). After extremely heavy service or severe impact When the vehicle does not steer correctly. loads. © 2012 Jones & Bartlett Learning 1 CDX Diesel Steering and Suspension Module 11: Vehicle Alignment Camber ready for review Camber is the inward or outward tilt of the top of the excessive negative camber causes the tire to wear on tires when viewed from the front of the vehicle. its inside shoulder. If the top of the tire tilts outward, it has positive use an alignment machine to check this angle, and camber. If it tilts inward, it has negative camber. refer to the equipment manufacturer’s directions for Incorrect camber angles affect both directional operating the machine. stability and tire wear. The camber angle is not adjustable; it is machined If there is significant difference in camber from one into the axle beam. If the camber angle is not within side of the vehicle to the other, the vehicle will pull to specifications, check the axle beam and steering the side with the greater amount of positive camber. knuckle for damage, and service as necessary. excessive positive camber causes the tire to wear on its outside shoulder. Kingpin Inclination (KPI) ready for review KPI is the angle measured between the centerline of use an alignment machine to check this angle and the kingpin (knuckle pin) and the vertical position as refer to the equipment manufacturer’s directions for viewed from the front of the vehicle. operating the machine. KPI and camber angle put the approximate center The KPI is not adjustable. If the inclination is not of the tire tread in contact with the road, and this within specifications, check the axle beam, kingpin, reduces steering effort and improves directional knuckle, or spindles for damage, and service as stability. necessary. do not bend the axle to alter dimension. Caster ready for review Caster is the forward or rearward tilt of the kingpin use an alignment machine to check this angle, and centerline when viewed from the side of the vehicle. refer to the equipment manufacturer’s directions for • Positive caster indicates that the kingpin is tilted operating the machine. rearward. Possible causes of incorrect caster are weak • negative caster indicates that the kingpin is (sagging) or broken springs, bent or twisted axle, or tilted forward. unequally tightened spring u-bolts. Caster is a directional stability angle only, and Caster is adjusted with tapered shims (wedge-shaped incorrect caster by itself does not affect tire wear. caster plates) installed between the leaf springs and Caster angle helps the driver return the front wheels the axle; therefore, adjust caster according to the to a straight-ahead position. vehicle manufacturer’s instructions. When two wheels have different caster angles, the vehicle pulls in the direction of the wheel with more negative caster, or less caster if both are positive. © 2012 Jones & Bartlett Learning 2 CDX Diesel Steering and Suspension Module 11: Vehicle Alignment Toe-In and Toe-Out ready for review Toe is the angle of the tires from the true straight- result in rapid tire wear, and most tire wear is caused ahead position when viewed from the top of the by incorrect toe settings. vehicle. • Too much toe-in wears the outer edges of the When the tire centerline is parallel with the vehicle tires. centerline, the toe is equal to zero. • Too much toe-out wears the inner edge of the When the front end of the tire points inward toward tires. the vehicle, the tire has toe-in. Toe is calculated in degrees, inches, or millimeters. When the front of the tire points outward from the Measuring toe involves marking tires with paint or vehicle, the tire has toe-out. chalk and measuring the front and back of the tires Toe-in is designed into the vehicle by the with a trammel bar. If the toe measurement is not manufacturer to counteract the natural tendency of within specifications, the cross tube or the tie rod the tires to toe-out when the vehicle is driven. ends will need to be adjusted; therefore, refer to the Incorrect toe angles usually do not affect directional vehicle manufacturer’s instructions for specifications stability of the vehicle; however, incorrect toe will and procedure. Maximum Turning Angle ready for review Maximum turning angle is the degree of movement Adjustable stop screws located on the steering from a straight-ahead position of the front wheels to knuckle control this angle; therefore, refer to the either an extreme right or left position. service manual for the correct adjustment procedure. This angle can be adjusted only if the manufacturer Proper turning angle prevents the tires from rubbing of the vehicle specifies the adjustment; therefore, against the nearest point on the chassis or the never increase this angle. steering gear from bottoming. use an alignment machine to check this angle, and refer to the equipment manufacturer’s directions for operating the machine. Turning Radius Angle ready for review The turning radius angle is also called the Ackermann manufacturer to give the best possible road contact angle or toe-out on turns. and to minimize tire wear during turns. during a turn, the inner wheel of a vehicle must This angle can be checked using an alignment follow a smaller circle than the outer wheel, which machine with radius plates; therefore, refer to the means that the inner and outer wheels must turn equipment manufacturer’s directions for checking at different angles. This angle is called the turning this angle. radius angle (or Ackermann angle). If this angle is not within specifications, inspect the This angle is built into the design of the tie rod arms, knuckle, tie rod arms, tie rod ends, and cross tube for the tie rod ends, and the cross tube assembly by the wear and damage, and service as necessary. © 2012 Jones & Bartlett Learning 3 CDX Diesel Steering and Suspension Module 11: Vehicle Alignment Axle Alignment ready for review Ideally, the vehicle’s axles should be perpendicular • Positive thrust angle means that tracking occurs to the vehicle centerline, and the rear wheels should to the right. track directly behind the front wheels when the • negative thrust angle means that tracking vehicle is moving straight ahead. When this happens, occurs to the left. the thrust line created by the rear wheels is parallel Tandem-axle vehicles will have a thrust line for each to the vehicle centerline. rear axle. If the axles are not perpendicular to the vehicle Axles out of alignment can cause the steering wheel centerline, the rear wheels do not track directly to rest in an uncentered position, the front tires to behind the front wheels, and the thrust line of the scrub and wear quickly, and the vehicle to oversteer rear wheels deviates from the centerline of the when turning in one direction and understeer when vehicle. turning in the other direction. Any deviation between the centerline and the thrust line is known as the thrust angle. Pinion Angle Adjustment ready for review Pinion angle is the slope of the centerline of the axle Working angle of rear axle u-joint is the difference pinion shaft.
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