ATASA 5 th Study Guide Chapter 36 Pages Clutches 74 Points. Clutches. Be Certain to Read the Summary

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1 ATASA 5 th Study Guide Chapter 36 Pages Points Be Certain to Read the Summary

2 1. The provides a mechanical coupling between the engine s & the transmission s shaft. The clutch allows the engine to while the vehicle is stopped and allows for easy shifting between gears while the engine is running. Clutch, Crankshaft, Input Clutch, Camshaft, Output Clutch, Flywheel, Input

3 2. The & the are the driving members of the clutch. (Inputs)

4 3. The driven member (output) of the clutch is the clutch, also called the. Clutch Disc a.k.a. Friction Disc

5 4. With the clutch pedal, the driving members are from the driven. Depressed, Disengaged Depressed, Dejected Depressed, Engaged

6 5. With the clutch pedal, all of the members are engaged & turn at the same speed. Released = Engaged

7 6. Some older clutch discs contained, which is a known carcinogen. (cancer causer) Sulfur Asbestos Uranium

9 7. The flywheel holds the starter, provides inertia & dampens vibration. Ding Gear, Engine Ring Gear, Engine Pinion Gear, Engine

10 8. A bore in the center of the flywheel & crankshaft hold the or bearing. Pilot Bushing

11 9. The pilot bushing or bearing supports the front of the transmission shaft & maintains alignment of the crankshaft, clutch components, and the pilot shaft. Counter Output Input

12 10. A flywheel reduces vibrations & allows for smoother shifting with 2 rotating plates connected together by a spring and damper system. Some may have a torque limiting feature. Dual Mass Dual Credit Dual Certification

13 11. Clutch disc friction facings can be either or of cotton, brass, rope, wire, paper based products, and graphite. Heat resistant asbestos has been eliminated from use. Molded or Woven

14 12. Grooves across the face of the friction disc provide for clean from the flywheel and pressure plate. Disengagement Disagreement Disenfranchisement

15 13. Clutch disc facing material is to the wave or springs Riveted, Cushioning Nailed, Cushioning Screwed, Torsional

16 14. The springs of the disc are fastened to the steel hub which is splined to the input shaft. Cushioning Dampening Retaining

18 15. The wave springs eliminate when the clutch is engaged & also reduce sticking. Tatter Chatter Shatter

19 16. coil springs arranged axially on the disc help absorb crankshaft vibration, abrupt engagement, & driveline shock. Torsional Retraction Cushioning

20 17. The bearing supports the front end of the transmission input shaft or pilot shaft. Input Release Pilot

21 18. The assembly must be able to tightly squeeze the disc against the flywheel & must be able to move away from the flywheel so the disc can spin down & stop rotating. Pressure Plate Dessert Plate Collector Plate

22 19. Pressure plates can use either springs or a spring to tightly hold the disc against the machined surface of the flywheel. Coil or Diaphragm

23 20. The clutch cover assembly employs 1st class action to move the pressure plate away from the flywheel as the clutch release bearing is forced towards the flywheel. Wedge Lever Pulley

24 21. A pressure plate uses weights that increase holding force of the clutch as engine speed increases. Multiple discs & plates are used to increase clutch capacity. Centrifugal Ball & Ramp Pneumatic

25 22. The diaphragm pressure plate uses a spring that works in the same manner as the bottom of an oil can. The metal yields when pressure is applied to it & flexes back when released. Belleville

26 23. The diaphragm pressure plate/clutch cover assembly is preferred because of its COMPACTNESS, light weight, FEWER moving parts, less operator PEDAL effort, its balance, & its long life.

27 24. The clutch release bearing is also called the bearing. Pilot Throw Out Precision Insert

28 25. The throwout bearing moves the levers or the diaphragm through the engagement & disengagement processes.

29 26. The clutch release bearing is mounted on & slides on a hub that is often the transmission shaft bearing retainer. Input Counter Output

30 A B C D

31 27. The throwout bearing is moved by the which is either a 1st or 2nd class lever.

32 28. Anytime the release bearing the release levers or diaphragm, it spins at engine rpm. Contacts or Touches

33 29. The clutch fork pivots on a. It is moved in to action by the clutch pedal & linkage. Ball Diamond Ball Joint Ball Stud

34 30. Clutch linkage can be either (cable or shaft & levers) or. Mechanical or Hydraulic Mechanical or Pneumatic Mechanical or Vacuum

35 30. Clutch linkage can be either (cable or shaft & levers) or. Mechanical or Hydraulic Mechanical or Pneumatic Mechanical or Vacuum

38 31. Clutch are the most common type of linkage with the advantages of flexibility, simplicity in design, they are lightweight and take up very little space under the hood & dash. Cabanas Fables Cables

39 32. Some cable linkages are through the use of a toothed, ratcheting pawl. Self Adjusting

40 33. Hydraulic clutch linkage uses a clutch cylinder and an apply cylinder connected with tubing that transmits force & pressure using ordinary brake fluid. Master Slave

41 34. Hydraulic clutches have the same concerns & symptoms as brake systems if is not bled out. Fluid Air ATF

42 34. Clutch linkage adjustment is done to make sure that the bearing (throw out bearing) does not touch the pressure plate release levers when the clutch is engaged. Release Crease Pilot

43 35. An internal slave cylinder is a combination of the slave & the throwout bearing. Concentric Slave Cylinders combine releaser and slave cylinders in one compact unit and outclass mechanical and semi hydraulic systems, with clear advantages in design, assembly, maintenance and operation. Release Crease Pilot

46 36. Clutch linkage adjustment is done to make sure that the bearing (throw out bearing) does not touch the pressure plate release levers when the clutch is engaged.

47 37. As the friction disc becomes worn & thinner, the springs move the throw out bearing. Less clearance between the levers & release bearing results in less pedal or play. Toward & Free Travel

48 38. Free travel is the the clutch pedal moves before the release bearing contacts the release levers or diaphragm spring of the pressure plate. Direction Distance Volume

49 39. A threaded fastener at the clutch fork is often used to adjust. This is measured with a ruler at the pedal and adjusted to manufacturers specs. (usually about ¾ ) Free Travel

50 40. Too little pedal free play results in clutch. Too much free play clashes gears during shifting. Shifting may then only be possible with the engine shut off! Slippage

51 41. Always check free travel diagnosing any clutch problems. A clutch worn too thin can no longer have it s pedal free play properly adjusted. After During Before

53 42. Clutch slippage occurs when the engine without generating any increase in torque applied to the driving wheels. Engine speeds up but vehicle speed remains the same. Accelerates Decelerates Idles

54 43. Clutch slippage is most noticeable in high gears. True or False

55 44. Clutch slippage can also be caused by soaked or very worn friction materials, weak or broken diaphragm spring, or a warped pressure plate due to improper torquing during reassembly. Fluid Oil Water

56 45. Clutch and happens if the disc isn t completely released when the pedal is fully depressed. Clutch drag causes gear clash when trying to shift & maybe hard starting Drag & Binding

57 46. A time that is over 5 seconds is proof of clutch drag or binding of the disc on the input shaft splines. Spindown Reverberation Volumetric

58 47. A binding or seized bearing can cause the input shaft to rotate at all times simulating a clutch dragging or binding problem. Starter Pilot Release

59 48. Clutch is shaking or shuddering felt in the vehicle as the clutch is engaged. Chatter Reverberation Chuggle

60 49. Clutch chatter is caused by contamination of the friction surfaces. Fluid Asbestos Heat

61 50. What 3 or 4 vehicle fluids could leak onto the clutch disc? hmmm 2 from the engine & 2 from the drive train

62 Clutch aligning tool used to center the friction disc with the pilot bushing during reassembly

63 51. Pedal can result from a flywheel with excessive runout, a misaligned bell housing or warped clutch disc or pressure plate. Pulsation Chatter Drop to the Floor

64 52. Clutch vibrations are different than pedal pulsations & can be felt the vehicle. Throughout Underneath On top of

67 53. Paying attention to (squeals, howls, grinding) & when they happen helps with diagnosis.

68 54. A throwout bearing typically makes noise only when the pedal is & goes away when the clutch pedal is. (the trans input shaft bearing behaves exactly opposite)

69 55. a hydraulic clutch may be similar to brake bleeding Be sure to check OEM guidelines, just to be sure.

73 Keeping wear mated parts together with a zip tie

Clutches for Automobiles and Light Trucks

Clutches for Automobiles and Light Trucks What does the Clutch do? Connects the engine torque to transmission when ENGAGED Unhooks engine from transmission when DISENGAGED Where is the driver s foot when