Podcast
Questions and Answers
A four-speed transmission is making a grinding noise only while shifting into second gear. This could be caused by ________.
A four-speed transmission is making a grinding noise only while shifting into second gear. This could be caused by ________.
A faulty 1-2 synchronizer sleeve
The detent mechanism inside a transmission is used to ________.
The detent mechanism inside a transmission is used to ________.
Locate the synchronizer sleeves in the correct position
A five-speed transmission is in third gear. Which is correct?
A five-speed transmission is in third gear. Which is correct?
A five-speed transmission is in fourth gear. Which is correct?
A five-speed transmission is in fourth gear. Which is correct?
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The cluster gear is supported by ________.
The cluster gear is supported by ________.
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Two technicians are discussing synchronizer rings. Technician A says they equalize the speeds of the synchronizer assembly and the speed gear being engaged. Technician B says they block the synchronizer sleeve briefly during a shift. Which technician is correct?
Two technicians are discussing synchronizer rings. Technician A says they equalize the speeds of the synchronizer assembly and the speed gear being engaged. Technician B says they block the synchronizer sleeve briefly during a shift. Which technician is correct?
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During a normal upshift, the synchronizer must ________.
During a normal upshift, the synchronizer must ________.
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A five-speed transmission is in second gear. Which is correct?
A five-speed transmission is in second gear. Which is correct?
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When one synchronizer is shifted into gear, the movement of the other shifter forks is blocked by the ________.
When one synchronizer is shifted into gear, the movement of the other shifter forks is blocked by the ________.
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The speedometer gear is usually driven by the ________.
The speedometer gear is usually driven by the ________.
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A transmission is lubricated ________.
A transmission is lubricated ________.
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Two technicians are discussing a transmission that is noisy in first, second, third, and reverse but quiet in fourth gear. Technician A says that there is probably a bad input shaft gear. Technician B says that it probably has a faulty 1-2 synchronizer assembly because reverse is on the synchronizer sleeve. Which technician is correct?
Two technicians are discussing a transmission that is noisy in first, second, third, and reverse but quiet in fourth gear. Technician A says that there is probably a bad input shaft gear. Technician B says that it probably has a faulty 1-2 synchronizer assembly because reverse is on the synchronizer sleeve. Which technician is correct?
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Overdrive enables the vehicle to ________.
Overdrive enables the vehicle to ________.
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An interlock system is used in a transmission to prevent ________.
An interlock system is used in a transmission to prevent ________.
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Gear oil that is too thin (low viscosity) might cause ________.
Gear oil that is too thin (low viscosity) might cause ________.
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With the engine running and the transmission in neutral with the clutch engaged (pedal up), which of these is NOT rotating?
With the engine running and the transmission in neutral with the clutch engaged (pedal up), which of these is NOT rotating?
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Which gear is most likely to use a spur gear?
Which gear is most likely to use a spur gear?
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To achieve a clash-free (no grinding sound) shift, what is used in a manual transmission?
To achieve a clash-free (no grinding sound) shift, what is used in a manual transmission?
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A ________ is used to prevent accidental engagement of reverse while making an upshift.
A ________ is used to prevent accidental engagement of reverse while making an upshift.
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Most manual transmissions use a case made from ________.
Most manual transmissions use a case made from ________.
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The idler gear is used for which gear?
The idler gear is used for which gear?
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Transaxle cases are made from ________.
Transaxle cases are made from ________.
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The ring gear on the differential is driven by the pinion gear on the ________.
The ring gear on the differential is driven by the pinion gear on the ________.
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In a transaxle, the synchronizer assemblies are mounted on the ________.
In a transaxle, the synchronizer assemblies are mounted on the ________.
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Technician A says that first gear uses the smallest driving gear and the largest driven gear. Technician B says that fourth gear uses the smaller driving gear and the largest driven gear. Which technician is correct?
Technician A says that first gear uses the smallest driving gear and the largest driven gear. Technician B says that fourth gear uses the smaller driving gear and the largest driven gear. Which technician is correct?
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How are tapered roller bearings generally adjusted in a transaxle?
How are tapered roller bearings generally adjusted in a transaxle?
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Which type of bearing usually requires preloading?
Which type of bearing usually requires preloading?
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Some front wheel drive vehicles use an intermediate drive shaft that ________ the CV joint angles.
Some front wheel drive vehicles use an intermediate drive shaft that ________ the CV joint angles.
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Which component of a transaxle is attached to the clutch disc?
Which component of a transaxle is attached to the clutch disc?
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How is a transaxle different from a transmission?
How is a transaxle different from a transmission?
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The inboard CV joints on the driveshaft are splined to the ________.
The inboard CV joints on the driveshaft are splined to the ________.
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What is the purpose of component 'A'?
What is the purpose of component 'A'?
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In this diagram, what gear is engaged?
In this diagram, what gear is engaged?
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What is the final drive ratio of this gear set______
What is the final drive ratio of this gear set______
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Most transaxles use ________.
Most transaxles use ________.
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The final drive ring and pinion gears in a typical transaxle are of the ________ type?
The final drive ring and pinion gears in a typical transaxle are of the ________ type?
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A typical transaxle has how many shafts?
A typical transaxle has how many shafts?
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The lubrication used in most transaxles uses ________.
The lubrication used in most transaxles uses ________.
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A transmission case made from magnesium burns at 1600 degrees F.
A transmission case made from magnesium burns at 1600 degrees F.
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A static shift test is performed with the engine ________.
A static shift test is performed with the engine ________.
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Blocker ring clearance can be checked using a ________.
Blocker ring clearance can be checked using a ________.
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When installing a bearing over a shaft, where should the force be applied?
When installing a bearing over a shaft, where should the force be applied?
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A transmission is noisy when driving in most gears. What is the most likely cause?
A transmission is noisy when driving in most gears. What is the most likely cause?
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"Rust dust" is an indication of what fault?
"Rust dust" is an indication of what fault?
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The end play in a transmission that uses tapered roller bearings is adjusted using a ________.
The end play in a transmission that uses tapered roller bearings is adjusted using a ________.
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The bearing on many transaxle input shafts and main shafts is adjusted using ________.
The bearing on many transaxle input shafts and main shafts is adjusted using ________.
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Technician A says that all gears with chips on their teeth should be replaced. Technician B says that burrs on the clutching teeth can be cleaned up using a small grinder. Which technician is correct?
Technician A says that all gears with chips on their teeth should be replaced. Technician B says that burrs on the clutching teeth can be cleaned up using a small grinder. Which technician is correct?
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Which test is best in isolating clutch system problems?
Which test is best in isolating clutch system problems?
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Using the improper transmission fluid can cause all of these EXCEPT ________.
Using the improper transmission fluid can cause all of these EXCEPT ________.
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What tool is used to check input shaft endplay?
What tool is used to check input shaft endplay?
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Study Notes
Transmission Components and Functions
- A four-speed transmission may grind during a shift into second gear due to a faulty 1-2 synchronizer sleeve.
- The detent mechanism positions the synchronizer sleeves correctly within the transmission.
- In a five-speed transmission in third gear, both the 1-2 synchronizer is centered and the 3-4 synchronizer engages to facilitate the shift.
Synchronizer Rings and Gear Engagement
- Synchronizer rings have two critical roles: equalizing the speeds of the synchronizer assembly and the gear, and briefly blocking the synchronizer sleeve during a shift.
- During a normal upshift, the synchronizer must slow down multiple components including the clutch disc and gear assemblies for smooth shifting.
- In second gear, power flows sequentially from the input shaft gear to the cluster gear before reaching second speed gear.
Transmission Lubrication and Noise Issues
- Transmission lubrication serves to remove excess heat and relies on gear oil dispersed by rotation.
- Noisy transmissions in first, second, third, and reverse but not in fourth may indicate a faulty 1-2 synchronizer assembly.
Performance Enhancements and Lock Mechanisms
- Overdrive benefits vehicles by enabling higher speed and better fuel economy.
- Transition mechanisms within transmissions, such as an interlock system, prevent engagement of reverse during an upshift.
Gear Types and Usage
- Gear oil of low viscosity can lead to increased gear noise.
- Spur gears are commonly used in reverse gear operation.
- Most manual transmissions utilize a case made from cast aluminum.
Bearings and Adjustments
- Manual transmissions can incorporate various bearing types, including needle, tapered roller, and ball bearings.
- Preloading of tapered roller bearings is essential, often adjusted using selective shims.
Performance Testing and Troubleshooting
- Excessive shift effort during static tests can stem from issues like worn shift linkage or synchronizer sleeves.
- A dynamic shift test is preferable for isolating clutch system problems.
Maintenance Protocols
- When checking fluid levels in manual transmissions, fluids should reach the bottom of the filler hole or remain within the marked area of a dipstick.
- When installing bearings, force should be applied on the inner race to prevent damage.
Transaxles: Differences and Components
- Transaxles include both the transmission and final drive assembly, offering a distinct configuration compared to standard transmissions.
- They commonly use helical-cut gears, with cage systems designed to handle varying velocity situations and prevent torque steer.
General Knowledge
- The main shaft is also known as either the intermediate shaft or counter shaft.
- "Rust dust" indicates worn steel parts, a sign that maintenance is overdue.
- Magnesium transmission cases can combust at 1600 degrees F, highlighting their susceptibility to heat.
Special Considerations
- Testing for input shaft endplay requires a dial indicator and stand for precision measurements.
- Blocker ring clearances can be checked effectively using feeler gauges to ensure proper function and shifting ease.
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Description
Test your knowledge on transmission components and their functions, including synchronizer rings and lubrication issues. This quiz covers critical aspects of shifting mechanics and the roles of various components in both four-speed and five-speed transmissions. Perfect for automotive enthusiasts and students alike!
