Clutch Power trains chapter 130

What are the typical operations needed when disassembling an automatic transmission/transaxle.

1) disconnect negative battery terminal 2) hoist the vehicle safely and drain fluid 3) disconnect driveshaft or dive axle shafts 4) disconnect all cooler lines, linkage and electrical connections. 5) disconnect the torque converter from the flex plate 6) support the engine before disconnecting the automatic transmission/transaxle 7) remove the transmission/transaxle mounting fasteners

Even the most efficient torque converter has a slippage rate of?

8% to 12%

How much transmission fluid should flow through the cooler? A. 2 quarts every 30 seconds B. 1 quart per minute C. 2 quarts per minute D. 2 pints per minute

A. 2 quarts every 30 seconds

Air pressure checking is used to test? A. Clutch packs B. TV adjustment C. Vacuum modulators D. Governors

A. Clutch packs

All of these may be repaired with the transmission in the vehicle EXCEPT? A. Friction discs B. Speed sensors C. Pressure switches D. Valve body

A. Friction discs

Technician A says that the torque converter should be separated from the flex plate before removing the automatic transmission/transaxle. Technician B says that the clutches should be installed dry when replacing the frictions and steels in a clutch pack. Which technician is correct? A. Tech A B. Tech B C. Both techs. D. Neither tech

A. Tech A

During which conditions is the torque converter clutch engaged?

At speeds over 25 MPH

What is the correct tool for measuring input shaft and output shaft endplay? A. Micrometer B. Dial indicator C. Dial caliper D. None of these

B. Dial indicator

Friction discs should be _____________ before being installed? A. Sanded B. Soaked in ATF C. Surface roughed up D. All of the above

B. Soaked in ATF

Technician A says that all friction and steel plates in a clutch pack should be replaced during and overhaul. Technician B says that the automatic transmission fluid cooler should always be flushed when a unit is rebuilt or replaced. Which technician is correct? A. Tech A B. Tech B C. Both techs D. Neither tech

B. Tech B

Technician A says that the sharp edges of spool valves should be rounded, using 400 grit sandpaper. Technician B says that all valve body parts should be cleaned and then dried using low pressure filtered compressed air. Which technician is correct? A. Tech A B. Tech B C. Both techs D. Neither tech

B. Tech B

Technician A says all gaskets should be discarded during tear down to keep the work area clean. Technician B says to keep the old valve body gaskets intact to make sure the replacement is a perfect match. Which technician is correct? A. Tech A B. Tech B C. Both techs D. Neither tech

B. Tech B.

What part must be replaced if dropped? A. Pump B. Torque converter C. Extension housing D. Pan

B. Torque converter

Two technicians are discussing automatic transmission/transaxle oil pumps. Technician A says that a vane type pump is a positive displacement pump. Technician B says that the pump is driven by the torque converter. Which technician is correct?

Both technicians

An electronically shifted overdrive automatic transmission is equipped with a transmission fluid temperature sensor. Technician A says that the shifts may be changed if the fluid temperature is too high. Technician B says that overdrive may be disabled if the transmission fluid temperature is too high. Which technician is correct?

Both techs

Technician A says ATF is used to cool, clean and lubricate an automatic transmission. Technician B says ATF is used to operate the shift valves and transmit engine torque. Who is correct?

Both techs

Technician A says shift solenoid so are used on some transmissions to control unshifts and downshifts. Technician B says governor pressure is used on some transmissions to control up shifts and down shifts. Who is correct?

Both techs

Technician A says that a five speed automatic transmission will often use a compound planetary gear set. Technician B says that the torque converter clutch is often pulsed on and off to provide smooth engagement. Which technician is correct?

Both techs

Technician A says that a held member is also called the reaction member. Technician B says that if any two elements are locked together then the output will be 1:1. Which technician is correct?

Both techs

Technician A says that hydraulic pressure affects transmission shift points. Technician B says that hydraulic pressure affects the feel of transmission shifts. Which technician is correct?

Both techs

Technician A says that most pressure regulating valves work by balancing hydraulic pressure against a spring force. Technician B says that electronic transmissions use solenoids to further regulate hydraulic pressure. Which technician is correct?

Both techs

Technician A says that one planetary gear set can provide gear reduction, overdrive and reverse. Technician B says that most transmissions today use compound (multiple) planetary gear sets. Which technician is correct?

Both techs

Technician A says that some manufacturers do NOT specify stall tests for their transmissions. Technician B says that stall testing can damage the transmission. Which technician is correct?

Both techs

Technician A says that the apply and hold units are usually the same for first gear when the gear selector is in drive or manual first. Technician B says that a defective vacuum modulator could cause the automatic transmission to delay shifting until a higher than normal speed is achieved. Which technician is correct?

Both techs

Technician A says that the automatic transmission/transaxle fluid (ATF) cooler is designed to cool the automatic transmission fluid. Technician B says that the cooler also warms the ATF. When the fluid is cold. Which technician is correct?

Both techs

Technician A says that when an automatic transmission/transaxle shifts into overdrive, the output shaft is rotating faster (higher RPM) than the engine crankshaft. Technician B says that an overdrive ratio is a ratio where the first number is less than 1. Which technician is correct?

Both techs

Technician A says the gear reduction occurs when the drive gear turns faster than then driven gear. Technician B says that overdrive occurs when the driven gear turns faster than the drive gear. Which technician is correct?

Both techs

Technician A says the gears in a planetary gearset are in constant mesh. Technician B says a planetary gearset has a ring gear and pinion gears. Which technician is correct?

Both techs

Two technicians are discussing an automatic transmission that will not go into any forward gear or reverse. Technician A says that a defective PCM or TCM could be the cause. Technician B says that a defective or worn pump could be the cause. Which technician is correct?

Both techs

Two technicians are discussing inspection of the transmission pan. Technician A says that some friction material at the bottom of the pan is normal. Technician B says that if any metal parts stick to a magnet then further investigation is needed to determine the cause. Which technician is correct?

Both techs

Two technicians are discussing one way clutches. Technician A says that a sprang and a roller are two types of one way clutches. Technician B says that a one way clutch could be installed upside down and cause the automatic transmission/transaxle to not function correctly. Which technician is complete.

Both techs

Technician A says extra care should be taken when removing and installing the torque converter assembly onto the input shaft to avoid damaging seals. Technician B says that the transmission oil cooler should be flushed whenever metal particles are found during transmission overhaul. Which technician is correct? A. Tech A B. Tech B C. Both techs D. Neither techs

C. Both techs

Slide hammers or special pullers are used to remove what component? A. Extension housing B. Filter C. Pump D. Rear seal

C. Pump

When assembling the pump, what is the alignment band used for? A. To guide the pump into the case B. To help hold the pump while installing the seal C. To align the pump halves while torquing the bolts D. To help install the outer O-ring

C. To align the pump halves while torquing the bolts

Clutch plate travel can be checked with? A. A vernier caliper B. A micrometer C. A ball gauge D. A feeler gauge

D. A feeler gauge

A scan tool can be used to________? A. Command a shift B. Check for transmission related sensor information C. Check for stored diagnostic trouble codes D. All of the above

D. All of the above

Caution should be used when performing a stall test because_________? A. It puts a strain on the engine B. It could be hazardous if the brakes fail C. It could increase the temperature of the ATF D. All of the above

D. All of the above

Fluid exchange can be performed using_________? A. Drain and refill three times B. A machine that forces the old fluid out, using a pump inside the machine that is attached to the fluid inlet after removing the transmission pan and filter. C. A machine that replaces the ATF through the cooler lines D. All of the above

D. All of the above

When transmission fluid temperature begins to rise above the preset limit the TCC_____________? A. Is engaged B. Helps reduce internal temperatures C. Is disengaged D. Both A and B are correct

D. Both A and B are correct

Using a torque converter smaller than stock size could result in? A. Slower than normal acceleration B. Faster than normal acceleration C. Reduced fuel economy D. Both B and C

D. Both B and C

Why should red assembly lube be avoided? A. Can harm friction disks B. Too slippery C. Clogs filters D. Looks like an ATF leak when it melts

D. Looks like ATF leak when it melts

Clutch pack clearance can be changed if not correct by using selective___________. A, piston B. Pressure plate C. Snap ring D. One of the above depending on the unit/application

D. One of the above depending on the unit/application

Which of these is the most current version of GM's Dexron ATF? Dexron VII Dexron VI Dexron V Dexron III

Dexron VI

How much is engine torque increased or multiplied when a typical torque converter is at stall speed?

Double

The torque converter clutch increases efficiency by?

Eliminating converter slippage

The impeller is attached to what?

Engine

True or False. It is not possible to install the one - way clutch backwards

False

True or False. The VIN is usually not needed when ordering transmission parts?

False

True or false. All automatic transmission fluid levels are checked with the engine running?

False

What are two methods for checking a clutch pack?

Feeler gauge and dial indicator

The major types of oil pumps used in an automatic transmission are?

Gear, Vane and Gerotor

The part of the torque converter that is located on the transmission side?

Impeller

The turbine is attached to what?

Input shaft

Which valve is controlled by the position of the gearshift selector?

Manual

Technician A says that fluid level concerns rarely contribute to automatic transmission concerns. Technician B says that dark burnt ATF means the PCM is improperly commanding shift activity. Which technician is correct?

Neither tech

What part controls mainline pressure in an electronically shifted automatic transmission?

Pressure control solenoid (or force motor)

Force motors are controlled by the computer using?

Pulse width modulation (or PWM)

Torque converters use a stator as a?

Reaction member

What is the part of the planetary gearset called that is being held by a band?

Reaction member

Check balls used in the valve body are constructed of?

Rubber Nylon Steel

The part of the torque converter that is located in the middle?

Stator

The stator is attached to what?

Stator shaft

The steel plates in a clutch pack are commonly called?

Steels

Technician A says automatic transmissions can shift gears without requiring an interruption of power flow. Technician B says automatic transmissions use synchronizer instead of planetary gearsets. Which technician is correct.

Tech A

Technician A says the converter pump is attached to the engine and turns as the engine rotates. Technician B says the turbine is attached to the engine and turns as the engine rotates. Which technician is correct?

Tech A

Two technicians are discussing automatic transmission and transaxles. Technician A says that it is normal for a vehicle to move slightly when the gear selector is in the drive position with the brakes released. Technician B says that the stator may be defective if the vehicle moves while in gear when the engine is at idle speed. Which technician is correct?

Tech A

Two technicians are discussing what could be wrong with a hydraulically shifted automatic transmission/transaxle that does not shift out of first gear regardless of vehicle speed. Technician A says that a defective governor could be the cause. Technician B says that a weak pump could be the cause. Which technician is correct?

Tech A

An electronically shifted automatic transmission operates okay in reverse, but the vehicle does no shift at all when moving forward. Technician A says that a defective torque converter is the likely cause. Technician B says that a defective shift solenoid could be the cause. Which technician is correct?

Tech B

Technician A says electric transmissions control shifts by directing the shift solenoid output pressure to the bands and clutches. Technicians B says electronic transmissions control shifts by directing the shift output pressure to the shift valves. Who is correct?

Tech B

Technician A says that the transmission hydraulic pump operates only when the vehicle is in motion. Technician B says that the transmission hydraulic pump operates when the engine is running. Which technician is correct?

Tech B

Technician A says the torque multiplication phase can occur when the stator one way clutch begins to freewheel. Technician B says the torque multiplication phase can occur when the stator one way clutch locks up. Which technician is correct?

Tech B

What is the purpose and function of an accumulator?

To cushion or dampen pressure surges

Why is it important to perform an end play check of an automatic transmission/transaxle during the reassembly process?

To make sure all components have the necessary clearances. To double check that all components have been properly reassembled.

Why is it important to flush the automatic transmission fluid cooler when a rebuilt or replacement automatic transmission/transaxle is being installed in a vehicle?

To make sure trapped debris in the cooler and lines do not flow into the new unit. To make sure there are no restrictions in the lines.

True or False. A CVT uses 2 pulleys and a drive chain to change gear ratios.

True

True or false. Some transmissions do not have a dipstick to check the fluid level?

True

The part of the torque converter that is located on the engine side?

Turbine