automotive service - grafton school district · automotive service 23. for balancing, lead wheel...
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Automotive Service Modern Auto Tech Study Guide Chapter 65 & 66 Pages 1241 1278 Tires, Wheels, Bearings 51 Points
Danger of Old Tires!!
Tires Manufactured Since 2000 Since 2000, the week and year the tire was produced has been provided by the last four digits of the Tire Identification Number with the 2 digits being used to identify the week immediately preceding the 2 digits used to identify the year.
Tires Manufactured Before 2000 The Tire Identification Number for tires produced prior to 2000 was based on the assumption that tires would not be in service for ten years. While they were required to provided the same information as today’s tires, the week and year the tire was produced was contained in the last three digits. The 2 digits used to identify the week a tire was manufactured immediately preceded a single digit used to identify the year.
Automotive Service 1. Tires act as a ______________ between the road & the vehicle as well as
providing _________________ with the road surface. Tires transmit driving torque, as well as braking, and cornering forces to the road.
Cushion, Traction
Automotive Service 2. _____________ tires are the most common of the __________ (airfilled) type.
Tubeless, Pneumatic
Automotive Service 3. The _______ of the tire holds its sidewalls snugly against the wheel flanges.
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Automotive Service 4. A tire’s _______________ resistance is the amount of friction produced as it
operates on the road surface. The less rolling resistance a tire has, the better the mileage of the vehicle will be.
Rolling Static Potential
Automotive Service 5._____ plies run at a slant & ______ plies run at right angles from bead to bead.
Bias, Radial
Automotive Service 6. Radial tires have very stable footprints which improve ____________,
cornering, ____________ & wear.
Traction, Handling, Braking, Mileage…you name it!
Automotive Service 7. Tire sizes that start with a “P” indicate a ___________________ car tire,
“T” indicates a _____________ spare, “C” indicates a ______________________ tire and “___ ___” indicates a Light Truck tire.
P = Passenger T = Temporary C = Commercial LT = Light Truck
Automotive Service 8. The number following the 1st letter designation indicates the tire section
______________ in millimeters.
Height Width Length
Automotive Service 9. ____________ __________ is the heighttowidth ratio (often called tire profile) and is expressed as a % of height to width.
Aspect Ratio Gear Ratio Braking Ratio
Automotive Service 10. Rim or wheel ________________, expressed in inches from
flange to flange is the last # in the tire size.
Height Width Diameter
Automotive Service 11. The maximum _____________ pressure (printed on the sidewall) is not the
recommended inflation pressure.
Automotive Service 12. Uniform Tire Quality Grading System rates _________________ (100500),
________________ (ABC), and ____________________ resistance (ABC). The 3 T’s of the UTQGS
Tread Wear, Traction, Temperature Resistance
Automotive Service 13. Tires also have an alphabetic ____________ rating that ranges from B to Z
(31 mph to 149 mph).
Speed Load Mileage
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Automotive Service 14. ___________________ tires get mounted with a certain side outward &
_____________ tires are rotation specific.
Directional
Automotive Service 15. High pressure, temporary, compact spare tires (doughnuts) typically get
inflated to _____ psi.
35 PSI 150 PSI 60 PSI
Automotive Service 16. Variation in tires include self_______, retreads, rain tires, and run_____ tires.
Self Inflating & Run Flat Self Sealing & Run Flat Self Service & Run Full
Automotive Service 17. If too much tread has worn off of the tires, solid rubber _______ _______ will
show up across the tread.
Wear Bars Rub Strips Median Strips
Automotive Service 18. Vehicles are equipped with radio signal, direct or
indirect, tire ____________ monitoring systems.
TPMS = Tire Pressure Monitoring System
Automotive Service TPMS
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Automotive Service 19. Wheels are commonly made of __________, _________________,
magnesium & even composite plastic.
Steel, Aluminum Iron, Chromium Brass, Titanium
Automotive Service 20. The __________________ area of a wheel allows for easy removal of the tire
but they must be fit with small, raised lips around the rim to keep the tire beads from sliding into that dropped area if they go flat.
Drop Center Wheel Rim Drip Cap
Automotive Service 21. Air is added to the tire through a valve ________ which is fit with a
springloaded, oneway, valve core.
Valve Core Valve Stem Valve Guide
Automotive Service 22. Lug ________ thread on to lug studs to anchor the wheel to the hub.
Some vehicles use lug bolts instead…VW, Mercedes, etc.
Lug Nuts vs. Lug Bolts
Automotive Service 23. For balancing, lead wheel ________________ are added to the rim to
prevent tramp & shimmy vibration.
Weights
Automotive Service 24. Ball or roller wheel ______________ mounted in a ______ allow the tire
& wheel assemblies to turn smoothly on the ______________. Castle nuts w/ cotter pins secure the hub on to the spindle.
Bearings, Hub, Spindle Spindles, Hub, Bearing Knuckles, Fist, Finger
Automotive Service 25. Tire problems can show up as ____________________,
abnormal wear ___________________, steering wheel pull, and other symptoms that are similar to those caused by suspension and brake systems.
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Vibrations, Patterns
Automotive Service 26. __________________________ is a common destructive problem that
wears both outer edges of the tread area. It can heat up the tire during operation causing ply separation while lowering mpg.
Under Inflation
Automotive Service 27._______________________ causes wear in only the center of the tread and
produces a hard ride.
Over Inflation
Automotive Service 28. Proper tire inflation specifications are not found on the tire sidewall!
Either the _______________ manual or the tire placard mounted inside the driver or passenger door jamb have the correct psi specs
Owner’s Manual General Repair Manual Tire Manual
Automotive Service 29. Tire ___________________ is the action of moving the tires at manufacturer
specified mileage intervals to different locations on the vehicle to increase tire life. This is done in a specified pattern too.
Relation Rotation Revitalization
http://www.tirerack.com
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Automotive Service 30. Tires & wheels should always be tightened on to the hub using a
_________________ wrench to prevent distortion of the wheel, hub, brake rotors, or brake drums. Use an X or star tightening pattern.
Torque Impact Cross
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Automotive Service 31. Both radial (right angle) and lateral (axial) tire & wheel ____________
(wobble) should be well under .100”
Preload Runout Backlash
Automotive Service 32. ______________ imbalance of the tire & wheel causes tramp or hop
(up & down vibration).
Static Attic Automatic
Automotive Service 33. _______________ imbalance of the tire & wheel
causes both tramp and shimmy (sidetoside vibration).
Dynamic Ceramic Systematic
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Automotive Service 34. When servicing (repacking) nondrive wheel bearings,
special ____________________________ wheel bearing grease is recommended instead of regular allpurpose, chassis grease.
High – Temperature Low – Viscosity High – Intensity
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Automotive Service 35. When repacking wheel bearings, partially fill the hub with ____________.
Grease Oil SAE #80w90 Gear Lube
Automotive Service 36. Always be sure to install new grease ________ on the hub and new
____________ pins on the castle nut when repacking wheel bearings!
Seals & Wrist Pins Seals & Cotter Pins Boots & Cotter Pins
Automotive Service 37. After repacking wheel bearings, it is critical to ______________
the spindle nut to manufacturer specs following mfgr. procedures!
Tighten or Torque
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Know this picture of tire inflation problems for the test
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Know this system of tire sizing for the test