Y-set Unit 1 review questions

What are three typical symptoms of manual transaxle problems ?

( 1 ) Abnormal bearing and gear noises ( 2 ) Shifting problems . ( 3 ) Fluid leaks .

Describe three symptoms of front drive axle troubles .

( 1 ) Abnormal noises . ( 2 ) Vibration . ( 3 ) Excessive play in the universal joints

List four points to consider when diagnosing bearing failures .

( 1 ) Check the general condition of all parts during disassembly , not just the most badly worn or damaged parts . operation . ( 2 ) Compare the failure to any information in the service manual and your knowledge of component ( 3 ) Determine the cause of the part failure . This helps ensure that the problem does not reoccur . ( 4 ) Make all repairs following manufacturer's recommendations and specifications .

Name five general rules to remember when servicing a transaxle .

( 1 ) Do not dent or nick the gasket sealing surfaces during disassembly or cleaning . ( 2 ) Keep all parts organized so that used parts can be returned to their original positions . ( 3 ) Clean all parts and closely inspect them for damage . Replace any parts showing wear , ( 4 ) Replace all gaskets and seals .

List six possible advantages of a front - wheel - drive vehicle with a transaxle over a rear - wheel - drive vehicle with a transaxle .

( 1 ) Reduced drive train weight and improved efficiency . ( 2 ) Improved traction on slippery pavement . ( 3 ) Increased passenger compartment space . ( 4 ) Smoother ride because of less unsprung weight ( 5 ) Quieter operation because engine and drive train noise is centrally located in the engine compartment ( 6 ) Improved safety because of increased mass in front of passengers .

What are four functions of a drive shaft ?

( 1 ) Sends turning power from the transmission to the rear axle assembly . ( 2 ) Flexes and allows vertical ( up and down ) movement of the rear axle assembly . ( 3 ) Provides a sliding action to adjust for changes in driveline length ( 4 ) Provides smooth power transfer .

What are three typical symptoms of automatic transaxle problems ?

( 1 ) Slipping in gear . ( 2 ) Abnormal noises . ( 3 ) Fluid leaks .

When is a center support bearing needed and why ?

A center support bearing is needed to hold the middle of a two - piece drive shaft . Pickup trucks commonly use a center support bearing because of the long distance between the transmission and rear axle

What is the difference between a fixed transmission solenoid and a variable transmission solenoid ?

A fixed transmission solenoid can produce only fully " on " or " off " locations for the spool valve to open or close the fluid flow control valve . A variable transmission solenoid can adjust the distance of spool valve opening by conducting different ECM duty cycles or signal frequencies

Explain the difference between a hunting gearset and a nonhunting gearset .

A hunting gearset does not mesh the same gear teeth during each revolution of the ring gear . A nonhunting gearset meshes the same gear teeth over and over during gearset operation .

The ________ must be capable of providing torque to both axles when turning corners .

Differential .

The term __________ generally refers to the parts that transfer power from the transmission to the drive wheels .

Driveline .

What major problem is a differential designed to prevent ?

The differential is designed to prevent the tires from sliding , squealing , and wear whenever the vehicle is turned .

Define the term clutch pedal " free play . "

The distance the clutch pedal or clutch fork moves before the throw - out bearing acts on the pressure plate .

What are the symptoms of clutch slippage ?

The engine races without an increase in the vehicle's road speed .

What should you do if the drive shaft is within recommended runout limits but still vibrates ?

It may need to be balanced by a machine shop that has specialized drive - shaft balancing equipment .

11. What is the function of an automatic clutch adjuster ?

It removes play from the clutch cable as components wear .

7. What is the main purpose of the pressure plate cover ?

Its main purpose is to hold the parts of the pressure plate assembly together

________ ________ often require a special type of gear fluid with friction additives intended for the wet clutch packs in modern differentials its housing placed and the

Limited - slip differentials

7. A drive chain is sometimes used to send crank- shaft power to the transaxle with a( n ) _______ mounted engine .

Longitudinally .

How do you measure axle end play ?

Mount the indicator so that the indicator plunger is parallel with the axle centerline . Set the indicator . needle on zero . Pull the axle in and out while watching the indicator . Compare the readings to factory specifications

What components are normally included in a CV joint kit

New joint components , grease , a boot , and boot straps .

Drive shaft problems can normally be classified into two categories : drive shaft_________ and drive shaft ________

Noise , vibration .

_________ tests are used to determine whether fluid pressure in the various circuits is normal .

Pressure .

5. Rear axle ratio is determined by comparing the number of teeth on the _________gear to the number of teeth on the__________ gear .

Ring , pinion .

The _________ usually has an exploded view of the transmission , showing how each part is located in relation to the others .

Service manual .

How do you check for clutch slippage ?

Set the emergency brake and start the engine . Place the transmission or transaxle in high gear . Then , try to drive the vehicle forward by slowly releasing the clutch pedal .

How do the shift valves work ?

Shift valves use control pressure ( oil pressure from regulator , solenoid valves , throttle valve , and manual valve ) to operate the bands , servos , and gearsets ..

The _________ or _________ is splined to the transmission output shaft .

Slip yoke , slip joint .

A ( n ) ________ is a listening device that can be used to isolate differential and axle noises .

Stethoscope

Define the term " gear ratio . "

The number of revolutions a drive gear must turn before the driven gear completes one revolution .

If a transmission is only noisy in second gear , what does that tell you about the problem ?

The problem is due to components related to that gear .

What is the common cause of a pulsating clutch pedal ?

The runout ( wobble or vibration ) of one of the rotating components of the clutch assembly .

Why should you use an alignment tool or pilot shaft when installing a clutch ?

To center the disc .

How is a dummy shaft used during transmission disassembly ?

To drive out the countershaft and reverse idler shaft .

What is the purpose of shifting the transmission into high gear before installation ?

To help position the input shaft into the clutch disc during transmission installation .

Why is an overdrive ratio used ?

To increase fuel economy .

Describe some causes of a dragging clutch .

Too much pedal free travel , a warped or bent friction disc , oil or grease or corrosion on the friction . surfaces , rusted or damaged transmission input shaft splines , or other problems inside the clutch housing .

4. A ( n ) _________ is a fluid clutch that provides a means of coupling and uncoupling the engine from the transmission .

Torque converter .

5. Clutch disc ________ springs help absorb some of the vibration and shock produced by clutch engagement .

Torsion or damping

How do you check for worn universal joints ?

Wiggle and rotate each universal joint back and forth while watching for side movement . Try to detect any play between the cross and yoke .

How does a constant velocity universal joint ( double - cardan joint ) work ?

With two universal joints operating together on one end of the drive shaft , the output shaft speed fluctuations are counteracted . The action of the second joint cancels the shaft speed changes produced fluctuations are counteractedby the first joint .

Explain how a continuously variable transaxle can increase fuel economy .

. A CVT possesses an infinite number of driving ratios , rather than three , four , or five forward speeds . The CVT uses spring - loaded , two - piece pulleys that have variable diameters . The variable diameters and driving ratios maintain the vehicle's road speed without changing the engine or motor - generator speed , creating the ability to keep the engine at its most efficient operation . This may result in up to a 25 % increase in fuel economy

Describe the two major types of transmission shift linkages .

1 ) On an external shift rod , rods . fit into levers on the shift mechanism and fork assembly . Spring clipshold the rods in the levers One end of each linkage rod is threaded so that the linkage can be adjusted . 2)With an internal shift rail , the bottom of the shift lever on a shift rail . Since the fork is located on the rail , it is also moved catches in one of the gates when the driver shifts gears . Each gate is mounted when changing gears .

Explain the two methods commonly used to hold a rear drive axle in its housing

A retainer plate type axle is commonly used with a removable carrier placed on the outside of the housing . A C - clip type axle is frequently used with an integral carrier , and the C - clips are placed on the inner ends of the axles .

What is a servo ?

A servo is an apply piston that operates the automatic transmission bands .

What is a stall test ?

A test that uses a tachometer to detect transmission slippage or a malfunctioning torque converter .

Explain the basic operation of a transfer case .

A transfer case sends power to both the front and rear axle assemblies in a four - wheel - drive vehicle .

What is a transaxle ?

A transmission and a differential combined in a single assembly .

2. What is the benefit of a wet clutch ?

A wet clutch does not slip , as a fluid coupling or torque converter may , and is more energy efficient

A ( n ) ________ is used in the apply circuit of a band or clutch to cushion initial application of oil pressure .

Accumulator

What is the potential danger of spinning a bearing with compressed air ?

Air pressure can make the bearing whirl at tremendously high speed . The bearing can explode and fly apart with lethal force .

What is used to check driveline angle ?

An angle gauge that reads in degrees

Identify four functions of a manual transmission in proper operating condition .

Any four of the following : ( 1 ) Be able to increase torque going to the drive wheels for quick acceleration . ( 2 ) Supply different gear ratios to match different engine load conditions . ( 3 ) Have a reverse gear for moving backwards . ( 5 ) Allow downshifting into any gear while the vehicle is moving , with all gears synchronized . ( 4 ) Provide the driver with an easy means of shifting transmission gears . ( 6 ) Operate quietly , with minimum power loss .

List three common causes of drive shaft vibration

Any problem affecting drive shaft balance , runout , and angle of shaft .

9. Clutch disc lining may contain ________, which is a known cancer - causing substance .

Asbestos .

Where do automatic transmission fluid leaks commonly occur ?

At the rear seal , front seal , oil pan gasket , extension housing gasket , and shift lever shaft seal.

What are the two types of lubricant commonly used in manual transaxles ?

Automatic transmission fluid and manual transmission gear oil .

What are the four main components of automatic transmission construction ?

Bell housing , case , pan , and extension housing .

18. A ( n ) ______ switch signals the main control module when the driver begins to slow or stop the vehicle .

Brake pedal .

1. An automotive __________ connects and disconnects the engine and manual transmission or transaxle .

Clutch .

During clutch engagement , oil pressure is routed into the ___________

Clutch drum .

The teeth on _________ gears are machined at an angle to the centerline of the gear shaft .

Helical .

10. A ( n ) ________ uses a simple hydraulic circuit to transfer clutch pedal action to the clutch fork .

Hydraulic clutch release mechanism

The _______ shaft is the center shaft that fits between the two CV joints .

Interconnecting .

What is the purpose of using a compound planetary gearset ?

It can provide more forward gear ratios than a simple planetary gearset .

What is normally the cause of burned transmission oil ?

It is caused by band and clutch friction material failure . It means serious damage has occurred , and the transmission will need major repairs .

What is gear backlash ?

high friction area between the gear teeth and allows the gears to expand It is the small clearance between the meshing gear teeth . Backlash allows lubricating oil to enter the during operation without binding or damage