Drive Train Exam Flashcards
1
Q
What is likely to result from re-assembling a synchromesh unit without matching the alignment marks?
A
Difficult gear shifting
2
Q
What can cause clutch chatter?
A
Both a and b
3
Q
What could make a standard transmission slip out of second gear?
A
Worn synchronizer clutch teeth
4
Q
When the driver pushes the clutch pedal down, what happens to the pressure plate?
A
The clutch disc would move away but not the flywheel
5
Q
The rear axle shafts are splined and fit to what?
A
Differential side gears
6
Q
What could cause a rhythmic knocking noise?
A
Chipped or broken gear tooth
7
Q
What is the main purpose of the differential?
A
To permit wheel speed variation
8
Q
Which dimensions are critical when selecting a replacement clutch disc?
A
All of the above
9
Q
What is the purpose of a friction clutch between the engine and transmission?
A
Connect or disconnect power flow
10
Q
In a three-speed transmission, the countershaft gears do not carry any part of the load in which gear?
A
High
11
Q
What is the purpose of pinion bearing preload?
A
Reduce inherent clearance to the minimum
12
Q
What should be done if scoring is found when removing a flywheel while replacing a clutch?
A
The flywheel should be machined smooth
13
Q
How can normal wear of gear teeth be checked?
A
By measuring backlash with a dial indicator or feeler gauge
14
Q
What is the term for turning or twisting force applied when pulling or pushing a wrench?
A
Torque
15
Q
What material are blocking rings in a transaxle made of?
A
Brass
16
Q
How is the rear axle ratio of an automobile or truck determined?
A
The number of ring gear teeth divided by the number of pinion gear teeth
17
Q
In a four-speed fully synchronized transmission, what type of gears are used?
A
All gears are of the synchronizing type
18
Q
What will a defective pilot bushing cause?
A
A noise whenever the engine is running and the clutch pedal is depressed and car not moving
19
Q
What is the most likely cause of gear grinding when shifting from low to second in a standard transmission?
A
Defective synchromesh unit
20
Q
When cornering, the differential case turns at the same speed as what?
A
Side gears
21
Q
As the facings of a single plate dry clutch wear, what will happen to the pedal?
A
Develop greater free play
22
Q
What are the three main purposes of a transmission?
A
Multiply torque, provide a reverse, and provide a neutral
23
Q
If a gear with 40 teeth turns at 450 RPM driving a second gear with 16 teeth, what is the speed of the second gear?
A
1125 RPM
Gear Ratio = Driven Gear Teeth / Driving Gear Teeth → (40/16) = 2.5 → 450 × 2.5 = 1125 RPM.
24
Q
What is the clearance between meshing teeth of two gears called?
A
Backlash
25
What is the effect of driving a vehicle for long periods on the highway with 4 wheel drive engaged?
Cause poor gas mileage and heavy tire wear
26
What is the purpose of snap rings on the circumference of a ball bearing?
Hold bearing parts together
27
In the differential, what is the ring gear bolted to?
Differential case
28
If a 4 inch diameter gear drives a 6-inch diameter gear with 100-ft-lb of torque, how many foot-pounds of torque are applied to the shaft of the 6-inch gear?
150 ft-lb
## Footnote
Torque Ratio = (Driven Gear Diameter / Driving Gear Diameter) → (6/4) × 100 = 150 ft-lb.
29
When a synchromesh transmission is shifted into second gear, what is the drive through?
4
## Footnote
Input shaft gear, Countershaft gear, Second gear on the countershaft, Second gear on the mainshaft (engaged by the synchronizer)
30
What must always be used when driving a seal that must first slide over a spline or keyway?
Mounting sleeve
31
What does the differential allow when a rear wheel drive vehicle with a standard differential is turning a corner?
Allows the rear wheels to turn at different speeds
32
To obtain an acceptable tooth contact pattern, what should the backlash normally be within?
0.002-0.014 in
33
If two meshed gears have a ratio of 5:1, how many times will the smaller gear turn while the large gear is turning 6 times?
30 times
34
Why are synchromesh units necessary in a standard transmission?
Because gears to be meshed are not turning at the same speed
35
What should be checked before conducting any test on an automatic transmission?
The transmission fluid level must be checked
36
What is true about the springs at the center of a clutch disc?
They absorb drivetrain shock and reduce vibrations
37
38
What is the primary function of the steering wheel in a rack and pinion steering system?
The steering wheel allows the driver to input steering commands, initiating motion transmitted through the steering system.
39
What is the role of the steering column in a rack and pinion steering system?
The steering column connects the steering wheel to the steering mechanism and transmits rotational input to the pinion gear.
40
What does the pinion gear do in a rack and pinion steering system?
The pinion gear converts the rotational motion from the steering wheel into linear motion to move the steering rack.
41
What is the function of the steering rack?
The steering rack moves laterally to turn the vehicle's wheels based on the pinion gear's rotation.
42
What do tie rods connect in a rack and pinion steering system?
Tie rods connect the steering rack to the steering knuckles, transferring lateral motion to the wheels.
43
What is the purpose of the steering rack housing?
The steering rack housing encloses the steering rack, providing support and protection for the rack and pinion gears.
44
What is the function of a power steering pump in hydraulic systems?
The power steering pump generates hydraulic pressure to assist with steering effort, especially at low speeds.
45
Fill in the blank: The _______ secures the rack and pinion assembly to the vehicle's frame or subframe.
Rack and Pinion Mounting Brackets
46
What do steering boots protect in a steering system?
Steering boots protect the tie rods and the inner components of the steering rack from dirt and moisture.
47
What is the purpose of rack and pinion seals?
Seals prevent leaks of hydraulic fluid and protect internal components from contaminants.
48
What does the steering gearbox do in a typical steering system?
The steering gearbox converts the rotational movement of the steering column into linear motion to turn the wheels.
49
How does the steering column operate in relation to the steering gearbox?
The steering column transmits rotational motion from the steering wheel to the gearbox.
50
What is the advantage of power steering options in vehicles?
Power steering options help reduce steering effort, especially in larger vehicles.
51
What is a disadvantage of recirculating ball steering systems?
They can be less precise than rack and pinion systems and may be less responsive.
52
What does the collapsible design of the steering column do?
It minimizes injury to the driver in case of a collision by allowing the column to collapse under impact.
53
What is the first step in servicing a hydraulic power steering system?
Check the power steering fluid level.
54
What is the procedure to flush the power steering system?
Drain the old fluid, run the engine to circulate cleaner fluid, and refill with fresh fluid.
55
What is an overview of Electric Power Steering (EPS)?
EPS replaces the hydraulic pump with an electric motor, using sensors to provide steering assistance.
56
What should be inspected if EPS feels heavy or unresponsive?
Check for diagnostic trouble codes (DTCs) for issues with the motor, sensors, or control module.
57
What is the purpose of software and calibration updates in EPS systems?
They correct performance issues or calibrate the system after part replacement.
58
What does Electro-Hydraulic Power Steering (EHPS) combine?
EHPS combines the hydraulic pump with an electric motor to drive the steering assist.
59
What should be inspected for damage or corrosion in the power steering system?
Wiring harness, connectors, and fuses
## Footnote
Repair or replace as needed.
60
What is the purpose of software and calibration updates in EPS systems?
To correct performance issues or to calibrate the system after part replacement
## Footnote
Use a diagnostic scan tool to check for updates.
61
What does Electro-Hydraulic Power Steering (EHPS) combine?
Hydraulic pump with an electric motor
## Footnote
Offers a compromise between hydraulic and electric systems.
62
What is the first service procedure for EHPS?
Check fluid level and inspect the pump
## Footnote
Important to check for leaks and unusual noises.
63
What can electrical failures in EHPS systems lead to?
Poor steering performance or complete loss of power assist
## Footnote
Inspect motor, wiring, and connectors.
64
What is required periodically to maintain EHPS systems?
Fluid flushing
## Footnote
Follow manufacturer guidelines for fluid replacement.
65
What is the purpose of Variable Assist Power Steering (VAPS)?
Adjusts the level of steering assist based on vehicle speed
## Footnote
More assist at low speeds, less assist at high speeds.
66
What should be checked if steering assist feels inconsistent?
Speed-sensing mechanism or power steering pump
## Footnote
Test steering at various speeds.
67
What is a common maintenance tip for power steering systems?
Regular fluid checks
## Footnote
Low fluid levels can cause steering issues.
68
What tools are needed for power steering system checks?
* Power steering fluid
* Flashlight
* Jack and jack stands
* Diagnostic scan tool
* Rags or shop towels
* Safety gloves and glasses
## Footnote
Essential for performing checks safely.
69
What is the purpose of checking the power steering fluid level?
Prevent poor steering performance and damage to the power steering pump
## Footnote
Low fluid levels can lead to severe issues.
70
What should be inspected for leaks in the power steering system?
* Pump and reservoir
* Steering rack or gearbox
* Hoses
## Footnote
Look for signs of fluid residue or puddles.
71
What noise might indicate low fluid or a failing power steering pump?
Whining or groaning sounds
## Footnote
Often a sign of air in the system.
72
What does a 'sticky' steering feel indicate?
Possible malfunctioning of the steering rack or pump
## Footnote
Check for issues if steering feels unresponsive.
73
What should be checked in the power steering pump?
* Unusual noises
* Leaks around the pump
* Drive belt condition
## Footnote
A failing pump can lead to poor steering.
74
What is the function of the steering rack or gearbox?
Converts the steering wheel’s rotational motion into lateral movement
## Footnote
Problems here can affect steering accuracy.
75
What is the purpose of inspecting the steering shaft and column?
Check for vibrations, binding, or poor steering response
## Footnote
Issues here can affect overall steering performance.
76
What is the purpose of a diagnostic scan for electronic power steering?
Identify problems with the electric motor, sensors, or control units
## Footnote
Connect a diagnostic scanner to the vehicle’s OBD-II port.
77
What should be monitored during a test drive after repairs?
Steering behavior and assist consistency
## Footnote
Listen for unusual noises.
78
What components should be regularly inspected in the steering linkage?
* Tie rods
* Pitman arm and idler arm
* Steering rack and pinion
* Steering shaft
* Drag link
## Footnote
Essential for maintaining steering safety.
79
What is the first step in inspecting the steering linkage?
Lift the vehicle and secure it with jack stands
## Footnote
Ensures safety during inspection.
80
How should tie rods be checked for wear?
Look for play at the connection points and visual damage
## Footnote
Excessive movement indicates they may need replacement.
81
What should be done if the steering box shows signs of leaks?
Check for loose components and ensure it is securely mounted
## Footnote
Regular inspection is key to proper function.
82
What is the purpose of lubricating steering linkage joints?
To prevent wear and reduce friction
## Footnote
Use grease fittings where applicable.
83
What indicates excessive steering play?
Worn or loose steering components
## Footnote
Makes vehicle control difficult.
84
What should be used to lubricate non-greaseable joints?
A penetrating lubricant
## Footnote
This ensures smooth operation of the joints.
85
What tool is used to tighten loose connections in the steering box?
A wrench or socket set
## Footnote
This helps ensure all components are secure.
86
What is the acceptable amount of play in the steering wheel?
No more than 1-2 inches
## Footnote
Excessive play can indicate worn components.
87
What should be inspected if there is play in the steering wheel but the linkage appears intact?
The steering shaft or column
## Footnote
Look for wear, rust, or damage.
88
What can misalignment in the steering linkage affect?
Steering accuracy, tire wear, and handling
## Footnote
Misalignment often leads to uneven tire wear.
89
What is the purpose of performing a wheel alignment?
To correct alignment issues after servicing steering components
## Footnote
This prevents uneven wear on tie rods and other parts.
90
What should be checked for after inspecting the steering linkage?
Test drive the vehicle
## Footnote
Ensure everything is functioning correctly.
91
What is the primary function of the power steering pump?
To circulate hydraulic fluid under pressure to assist with steering
## Footnote
Regular inspection is essential for performance.
92
What tools are needed to inspect and service a power steering pump?
Wrenches, torque wrench, power steering fluid, flashlight, safety gloves, jack, fluid catch basin, shop towels
## Footnote
These tools facilitate proper inspection and maintenance.
93
What should be checked during a visual inspection of the power steering pump?
Signs of leakage, fluid level, and condition of the pump
## Footnote
Look for puddles of fluid and check for contamination.
94
What does a whining noise from the power steering pump indicate?
Possible internal pump wear, low fluid, or air in the system
## Footnote
This requires further investigation.
95
What is the importance of checking the condition of the power steering fluid?
It is crucial for proper pump operation
## Footnote
Contaminated fluid can damage the pump.
96
What should be done if the power steering fluid is dirty or contaminated?
Perform a fluid change
## Footnote
This prevents damage to the pump.
97
What tool is used to check the pump pressure in a power steering system?
A power steering pressure gauge
## Footnote
Consult the vehicle’s service manual for specifications.
98
What indicates that the power steering pump may need to be replaced?
If the pump is failing despite fluid changes and adjustments
## Footnote
Replacement may be necessary for proper steering.
99
What is the first step when replacing a power steering pump?
Disconnect the battery
## Footnote
This ensures safety when working on electrical components.
100
What should be done after installing a new power steering pump?
Bleed the system to remove air
## Footnote
This is necessary for proper operation.
101
What are the key benefits of accurate wheel alignment?
* Improved vehicle handling
* Even tire wear
* Enhanced operational efficiency
## Footnote
Proper alignment is crucial for vehicle performance and safety.
