Quantcast Tire and Wheel-Bearing Noise

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heat  during  operation.  The  center  of  the  tread  flexes upward  and  does  NOT  touch  the  surface  of  the  road. Underinflation will cause rapid tread wear, loss of fuel economy, and possibly ply separation (plies tear away from each other). Uneven  tire  inflation  pressure  can  cause  steering wheel pull. For example, when a vehicle that ha’s the left  front  tire  underinflated  and  the  right  front  tire properly inflated, the vehicle has a tendency to pull to the left. The low air pressure in the left tire has more rolling resistance. This action tends to pull the steering wheel away from the normally inflated tire. Tire Vibration Problems When one of the front tires is vibrating, it can be felt in the steering wheel. When one of the rear tires is vibrating, the vibration can be felt in the center and rear of   the   vehicle.   Tire   vibration   can   be   attributed   to several  problems,  such  as  out-of-balance  condition, ply separation, tire runout, a bent wheel, or tie cupping. Tire and Wheel-Bearing Noise Tire  noise  usually  shows  up  as  a  whine  due  to abnormal  tread  wear  or  a  thumping  sound  caused  by ply separation. Tire replacement is required to correct these  problems. Wheel-bearing  noise  is  produced  by  dry,  worn wheel  bearings.  The  bearing  will  make  a  steady humming type sound. This is due to the rollers or balls being  damaged  from  lack  of  lubrication  and  are  no longer  smooth.  To  check  for  a  worn  wheel  bearing, raise and secure the vehicle, and rotate the tire by hand. Feel and listen carefully for bearing roughness. Also, wiggle  the  tire  back  and  forth  to  check  for  bearing looseness.  It  may  be  necessary  to  disassemble  the wheel bearing to verify the problem. REVIEW  4  QUESTIONS Q1. What are the two basic functions of a tire? Q2. List the six major parts of a tire. Q3. What is the major disadvantage of a radial tire? Q4. What information is commonly given on the tire sidewall? Q5. What is the most commonly used wheel used on passenger  vehicles? Q6.  What  are  the  two  basic  wheel-bearing configurations? Q7. For a tire to be in dynamic balance, the weight must  be  evenly  distributed  around  the  axis  of rotation.  (T/F) WHEEL  ALIGNMENT Learning   Objective:   State   the   purpose  and describe each  wheel  alignment  setting.  Describe  the  different types  of  equipment  used  during  wheel  alignment service. The term alignment means to position in a straight line. Relating to vehicles, alignment means to position the  tires  so  they  roll  freely  and  evenly  over  the  road surface.  The  main  purpose  of  wheel  alignment  is  to make  the  tires  roll  without  scuffing,  slipping,  or dragging under all operating conditions. Correct wheel alignment   is   essential   to   vehicle   safety,   handling, extending  tire  life,  and  achieving  maximum  fuel economy. The different types of wheel alignments are front end alignment, thrust angle alignment, and four-wheel alignment. 1.  In  a  front  end  alignment,  the  front  only  is checked. This is fine in some cases, but are the front tires properly positioned in front of the rear tires? 2.   With the thrust angle alignment, the wheels are squared to each other. This action will eliminate “dog tracking”  that  you  may  have  seen  on  a  vehicle  that appears to be going down the road with the rear end a foot over from the front. 3. The best way to align a vehicle is a four-wheel alignment.  This  alignment  will  not  only  do  what  the thrust angle alignment does but also includes adjusting the settings on the rearofthe vehicle as well as the front. Not all vehicles are fully adjustable, so before any alignment  always  consult  the  manufacture's  service manual.  Regular  wheel  alignments  will  save  you  as much in tire wear as they cost. It should be considered routine,  preventive  maintenance. STEERING  GEOMETRY Steering geometry is the term manufacturers use to describe  steering  and  wheel  alignment.  The  six fundamental angles or specifications that are required for a proper wheel alignment are as follows: Caster Camber Toe 8-41



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