Automatic Transmissions C27, C4 VehTech

Question 1

What is a flex plate used for?

Answer 1

To mount the torque converter to the crank shaft. Positioned between the engine crankshaft and the torque converter (Helps the distribution of heat)

Question 2

Identify the three main parts of a torque converter.

Answer 2

Impeller/Pump, Turbine, and Stator

Question 3

Which part of the torque converter rotates directly with the engine?

Answer 3

Impeller

Question 4

What is the turbine directly connected to?

Answer 4

Coupled (Splined) to the transmission turbine shaft and forms the front half of the torque converter.

Question 5

How does the fluid flow through the turbine?

Answer 5

Fluid from the impeller and the turbine vanes and flows around the split guide.

Question 6

Where is the stator located?

Answer 6

Between the Impeller and the turbine, which is splinded to the outer race of a one way roller clutch mounted on the stator support.

Question 7

List the lockup clutch components.

Answer 7

Backing plate, a lockup clutch plate, lockup clutch piston, splined to the converter.

Question 8

Identify two types of lockup torque converters.

Answer 8

Centrifugal and piston

Question 9

What does and overrunning clutch do?

Answer 9

Keeps the stator assembly from rotating when driven in one direction and permits overrunning (Rotation).

Question 10

Which type of vehicle do piston type lock up clutches tend to be used?

Answer 10

Heavy Duty Truck Applications

Question 11

What is the difference Between bushing and thrust washers?

Answer 11

Bushings are cylindrical shaped usually held in by press fit. (Radial Loads)
Thrust washers control free (axial movement), Inserted between various spots

Question 12

What do bushings have to do with transmission fluid?

Answer 12

They are used to control fluid flow, some restrict flow, while others direct flow.

Question 13

What do Thrust washers Control?

Answer 13

Used to help control heat expansion, used for proper end play.

Question 14

What are Torrington bearings?

Answer 14

Thrust washers fitted with roller bearings, to limit end play and reduce friction between two moving parts.

Question 15

What is the purpose of an overrunning clutch?

Answer 15

Used to hold and drive planetary gear sets

Question 16

What are two types of overrunning clutches?

Answer 16

Roller type and One way Spring

Question 17

In reference to multi-disc clutches list the components contained in the Drum?

Answer 17

Cylinder, Hub, Piston, Piston return springs, Seals, Pressure plate, Steel plate, Friction plate, and snap ring.

Question 18

What does ATF do in the automatic transmission?

Answer 18

Extremely Important, Improves durability is used as a lubricant for the transmission to remove heat.

Question 19

What does the pressure of ATF change?

Answer 19

Changes with Engine Speed, and Load

Question 20

What are three types of oil pumps commonly used in automatic transmissions?

Answer 20

Gear, Vane, and Rotor Types

Question 21

Pressure regulator valves are generally what type of valve?

Answer 21

Typically Spool valves, which toggle back and fourth

Question 22

What does a kickdown circuit do?

Answer 22

Provides a downstep when the driver requires additional power. (Quick downshift)

Question 23

Name the parts in a Planetary Gear Set?

Answer 23

Sun gear (Center Gear), Planetary Pinion gears, Placed inside a ring gear having internal teeth, and a Carrier

Question 24

What are the laws of simple planetary gear operation?

Answer 24

Used to Increase or decrease torque and/or obtain neutral, low, Intermediate, high, or reverse.

Question 25

What are the two types of oil flow in a torque converter?

Answer 25

Vortex and Rotary

Question 26

Input, Output, Held =

Answer 26

Maximum Reduction

Question 27

Held, Output, Input =

Answer 27

Minimum Reduction

Question 28

Output, Input, Held =

Answer 28

Maximum Increase

Question 29

Held, Input, Output =

Answer 29

Minimum Increase

Question 30

Input, Held, Output =

Answer 30

Slow Reverse

Question 31

Output, Held, Input =

Answer 31

Fast Reverse

Question 32

When any two members are held together speed/direct the same?

Answer 32

Direct Drive

Question 33

When no member is Held, results in?

Answer 33

Neutral

Question 34

What is the purpose of venting in the automatic transmission?

Answer 34

Atmospheric pressure that forces fluid into a pump when the pump creates a low pressure in the inlet port.

Question 35

List the parts of the Valve Body?

Answer 35

Valve Body, Separator plate, Transfer plate

Question 36

How does a PRV work?

Answer 36

There is a valve and spring inside a PRV that you can set the pressure.

Question 37

In a hydraulically Controlled Transmission what is the purpose of the governor?

Answer 37

The purpose is to either determine if the gear shifts up or down depending on the road speed.

Question 38

What is the leading cause of Shift Delay?

Answer 38

For operating when there is a heavy load on the transmission the requires more torque then speed.

Question 39

What is the purpose of a kick down?

Answer 39

Forces a quick down shift to allow for more power

Question 40

List 7 components that provide input information to the TCM

Answer 40

MAP, TP, MAF, IAT, BARO, ECT, CKP

Question 41

Most common planetary gear set?

Answer 41

Simpson

Question 42

Identify all input circuit components

Answer 42

Shift selector, Throttle position sensor, Engine speed sensor, Turbine speed sensor, Output speed sensor, C3 pressure sensor, Sump Temperature sensor, Coolant sensor

Question 43

What is the purpose of the VIM?

Answer 43

Housing that provides the necessary relays, fuses, and connection points.

Question 44

How many types of solenoids are there in a WT Transmission and what are the called?

Answer 44

Two: 1. Normally Open 2. Normally Close

Question 45

What are primary components of a hydraulic system?

Answer 45

Transmission fluid, Charging pump, Three integral filters, electro control modules, Breather, C3 Pressure switch.

Question 46

How is a rotating clutch driven?

Answer 46

Splined to the turbine shaft, therefore rotates with turbine

Question 47

What is the purpose of the balance piston?

Answer 47

A balance piston is used to enhance control of, off-going and On- coming rotating clutches.

Question 48

How many gear options are available in the WT Transmissions?

Answer 48

Six total different options: | 1,2,3,D,N,R

Question 49

Which Clutches are engaged in first?

Answer 49

C1, C5

Question 50

Which Clutches are engaged in Third?

Answer 50

C1, C3

Question 51

Which Clutches are engaged in Fourth?

Answer 51

C1, C2

Question 52

Which Clutches are engaged in Reverse?

Answer 52

C3, C5