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ATASA 5 th Study Guide Chapter 36 Pages 10711091 Clutches 74 Points
ATASA 5 th Clutches Be Certain to Read the Summary
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
ATASA 5 th Clutches
2. The _____________ & the ___________ ___________ are the driving members of the clutch. (Inputs)
ATASA 5 th Clutches
3. The driven member (output) of the clutch is the clutch _______, also called the __________ _______.
Clutch Disc a.k.a. Friction Disc
ATASA 5 th Clutches
4. With the clutch pedal _______________, the driving members are ______________ from the driven.
Depressed, Disengaged Depressed, Dejected Depressed, Engaged
ATASA 5 th Clutches
5. With the clutch pedal ________________, all of the members are engaged & turn at the same speed.
Released = Engaged
ATASA 5 th Clutches
6. Some older clutch discs contained _________________, which is a known carcinogen. (cancer causer)
Sulfur Asbestos Uranium
ATASA 5 th Clutches
ATASA 5 th Clutches
7. The flywheel holds the starter _______ _______, provides inertia & dampens ___________ vibration.
Ding Gear, Engine Ring Gear, Engine Pinion Gear, Engine
ATASA 5 th Clutches
8. A bore in the center of the flywheel & crankshaft hold the __________ _________ or bearing.
Pilot Bushing
ATASA 5 th Clutches
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
ATASA 5 th Clutches
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
ATASA 5 th Clutches
11. Clutch disc friction facings can be either _______ or _________ of cotton, brass, rope, wire, paperbased products, and graphite. Heatresistant asbestos has been eliminated from use.
Molded or Woven
ATASA 5 th Clutches
12. Grooves across the face of the friction disc provide for clean ____________________ from the flywheel and pressure plate.
Disengagement Disagreement Disenfranchisement
ATASA 5 th Clutches
13. Clutch disc facing material is ______ to the wave or __________ springs
Riveted, Cushioning Nailed, Cushioning Screwed, Torsional
ATASA 5 th Clutches
14. The __________ springs of the disc are fastened to the steel hub which is splined to the input shaft.
Cushioning Dampening Retaining
ATASA 5 th Clutches
ATASA 5 th Clutches
15. The wave springs eliminate ______________ when the clutch is engaged & also reduce sticking.
Tatter Chatter Shatter
ATASA 5 th Clutches
16. _________________ coil springs arranged axially on the disc help absorb crankshaft vibration, abrupt engagement, & driveline shock.
Torsional Retraction Cushioning
ATASA 5 th Clutches
17. The __________ bearing supports the front end of the transmission input shaft or pilot shaft.
Input Release Pilot
ATASA 5 th Clutches
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
ATASA 5 th Clutches
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
ATASA 5 th Clutches
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
ATASA 5 th Clutches
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
ATASA 5 th Clutches
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 ®
ATASA 5 th Clutches
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.
ATASA 5 th Clutches
24. The clutch release bearing is also called the ___________ bearing.
Pilot Throw Out Precision Insert
ATASA 5 th Clutches
25. The throwout bearing moves the _______ _______ levers or the diaphragm through the engagement & disengagement processes.
ATASA 5 th Clutches
26. The clutch release bearing is mounted on & slides on a hub that is often the transmission _________ shaft bearing retainer.
Input Counter Output
ATASA 5 th Clutches
A B C D
ATASA 5 th Clutches
27. The throwout bearing is moved by the _________ _______ which is either a 1st or 2nd class lever.
ATASA 5 th Clutches
28. Anytime the release bearing ______________ the release levers or diaphragm, it spins at engine rpm.
Contacts or Touches
ATASA 5 th Clutches
29. The clutch fork pivots on a _______ _______. It is moved in to action by the clutch pedal & linkage.
Ball Diamond Ball Joint Ball Stud
ATASA 5 th Clutches
30. Clutch linkage can be either __________ (cable or shaft & levers) or ___________________.
Mechanical or Hydraulic Mechanical or Pneumatic Mechanical or Vacuum
ATASA 5 th Clutches
Mechanical or Hydraulic Mechanical or Pneumatic Mechanical or Vacuum
ATASA 5 th Clutches 30. Clutch linkage can be either __________ (cable or shaft & levers)
or ___________________.
ATASA 5 th Clutches
ATASA 5 th Clutches
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
ATASA 5 th Clutches
32. Some cable linkages are ________________________ through the use of a toothed, ratcheting pawl.
SelfAdjusting
ATASA 5 th Clutches
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
ATASA 5 th Clutches
34. Hydraulic clutches have the same concerns & symptoms as brake systems if ______ is not bled out.
Fluid Air ATF
ATASA 5 th Clutches
34. Clutch linkage adjustment is done to make sure that the __________ bearing (throwout bearing) does not touch the pressure plate release levers when the clutch is engaged.
Release Crease Pilot
ATASA 5 th Clutches
35. An internal ______________ slave cylinder is a combination of the slave & the throwout bearing.
ATASA 5 th Clutches
Release Crease Pilot
Concentric Slave Cylinders combine releaser and slave cylinders in one compact
unit and outclass mechanical and semihydraulic systems, with clear advantages in
design, assembly, maintenance and operation.
ATASA 5 th Clutches
ATASA 5 th Clutches
36. Clutch linkage adjustment is done to make sure that the _______ bearing (throwout bearing) does not touch the pressure plate release levers when the clutch is engaged.
ATASA 5 th Clutches
37. As the friction disc becomes worn & thinner, the springs move ____________ the throwout bearing.
Less clearance between the levers & release bearing results in less pedal ______ ________ or play.
Toward & Free Travel
ATASA 5 th Clutches
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
ATASA 5 th Clutches
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
ATASA 5 th Clutches
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
ATASA 5 th Clutches
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
ATASA 5 th Clutches
ATASA 5 th Clutches
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
ATASA 5 th Clutches
43. Clutch slippage is most noticeable in high gears. True or False
ATASA 5 th Clutches
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
ATASA 5 th Clutches
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…
ATASA 5 th Clutches
Drag & Binding
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
ATASA 5 th Clutches
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
ATASA 5 th Clutches
48. Clutch ______________ is shaking or shuddering felt in the vehicle as the clutch is engaged.
Chatter Reverberation Chuggle
ATASA 5 th Clutches
49. Clutch chatter is caused by ____________ contamination of the friction surfaces.
Fluid Asbestos Heat
ATASA 5 th Clutches
50. What 3 or 4 vehicle fluids could leak onto the clutch disc?
hmmm…2 from the engine & 2 from the drive train…
ATASA 5 th Clutches
Clutch aligning tool used to center the friction disc with the pilot bushing during reassembly
ATASA 5 th Clutches
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
ATASA 5 th Clutches
52. Clutch vibrations are different than pedal pulsations & can be felt _____________ the vehicle.
Throughout Underneath On top of
ATASA 5 th Clutches
ATASA 5 th Clutches
ATASA 5 th Clutches
53. Paying attention to __________ (squeals, howls, grinding) & when they happen helps with diagnosis.
ATASA 5 th Clutches
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)
ATASA 5 th Clutches
55. __________ a hydraulic clutch may be similar to brake bleeding… Be sure to check OEM guidelines, just to be sure.
ATASA 5 th Clutches
ATASA 5 th Clutches
ATASA 5 th Clutches
ATASA 5 th Clutches
Keeping wear–mated parts together with a zip tie
ATASA 5 th Clutches
