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Transmission
| Question | Answer |
|---|---|
| What do you lubricate a CV Joint with? | Grease |
| What noise does a faulty wheel bearing make? | A humming noise |
| A lack of free play or oil contamination on a flywheel would cause what fault? | A slipping clutch |
| What would cause the clutch to slip? | Not enough free play in the clutch |
| When changing gear the transmission does not deselect 2nd gear, what could cause this fault? | The transmission to lock up |
| What turns the drive through a 90 degree angle or allows 1 wheel too turn faster than the other? | A differential |
| The coefficient of friction of the clutch disc - | Remains constant |
| When 5th gear is engaged in a five speed gearbox | the input shaft rotates slower than the output shaft |
| A detent ball and spring mechanism is often used | to lock the selector shafts in position |
| A fully floating axle arrangement is often used on | light commercial vehicles |
| Which of the following faults is most likely to produce clutch judder? | Sticking clutch cable |
| A front wheel drive vehicle produces a loud knocking sound during very sharp left-hand turns. Which of the following is the most likely cause? | A badly worn constant velocity joint |
| Air present in a hydraulic clutch operating system will:: | make it difficult to disengage the clutch |
| A badly worn remote gear change mechanism will: | make it difficult to engage the gears |
| To allow for changes in the propeller shaft length due to suspension movement: | a sliding joint is fitted |
| Transmission vibration can be caused by: | misaligned propeller shaft universal joints |
| A car will fail its annual MOT test if: | an outer constant velocity joint gaitor is split |
| A clutch has excessive free play could: | make it difficult to disengage the clutch |
| Why are multiple clutches fitted | The engine produces high torque |
| What type of shaft is commonly fitted to FWD cars? | Hollow drive shafts |
| how are the gears mounted to the output shaft of a gearbox? | Splined onto the output shaft |
| What transmits drive to the gearbox input shaft? | The centre plate splines |
| The typical final drive ratio is | Between 3:1 and 4:1 |
| What type of gears are used in a constant mesh manual gearbox? | Helical gears |
| What would cause a driveline vibration? | A worn prop shaft UJ |
| What type of bearings are used in a fully floating axles? | Taper roller bearings |
| What is the purpose of a detent? | Lock the selector shafts in position |
| In a final drive, where is the pinion positioned in relation to the crown wheel? | typically positioned below the centre line of the crown wheel or offset to the centre line |
| on a diaphragm clutch, the pressure plate remains constant in line with friction wear? | Yes, the clamping force remains relatively consistent despite friction wear |
| To allow the change in length and movement a pro shaft is fitted with? | A sliding joint |
| The overall ratio is calculated by ? | Multiplying the gearbox ratio by the final drive ratio |
| What prevents 2 gears being selected at the same time? | An interlock mechanism |
| Which component has the gear fixed to it? | The lay shaft |
| What are the symptoms of a worn input shaft bearing in the gearbox? | The transmission to vibrate |
| How can you confirm a fault has been rectified ? | Road test |
| What would cause the gears to grind/crash when being selected? | A worn synchromesh |
| What would likely cause a knocking noise when turning? | A faulty CV joint |
| Too much/excessive free play in the clutch pedal mechanism would cause ? | Difficulty in disengaging the clutch and selecting gears |
| What would be the effect of air in the hydraulic clutch system? | Difficult to disengage the clutch |
| What noise would a fault clutch release bearing make? | A whining noise |
| What bearing is fitted to a light commercial vehicle axle? | Fully floating type |
| What is a transaxle? | Combines the gearbox and final drive components, typically FWD |
| Where would you find a cv joint fitted? | A drive shaft on FWD car |
| What effects the torque capability of a clutch? | It's mean radius, spring force, coefficient of friction and the number of plates. |
| A coil spring clutch is ? | Heavier and less suitable to high speed engines than a diaphragm clutch |
| A worn clutch plate would cause - | Poor gear selection |
| What component connects the input and output shafts? | The lay shaft |
| What does CV stand for | Constant Velocity |
| What is the purpose of the cushioning spring between the friction plate linings ? | To prevent juddering |
| What part of the clutch is connected to the input shaft? | Clutch friction/centre plate splines |
| The layshaft is also known as | Secondary shaft |
| Which components is NOT part of the clutch release mechanism? | Centre plate |
| A customer’s signature is required to authorise work being carried out on a vehicle because it | creates a legally binding contract between the customer and garage |
| What of type of gears are used in a sliding mesh gearbox? | Spur gears |
| To safeguard yourself and others when working in a vehicle repair workshop you should: | a) comply with all safety requirements b) be aware of others in your vicinity c) avoid any inappropriate behaviour |
| Multi-plate clutches are often used when there is not much space AND: | a high torque has to be transmitted |
| Which is not a legal requirement when test driving a vehicle on the public road | Trade plates front and rear |
| The driver complains of great difficulty engaging gears, especially 1st gear. The most likely cause of this is: | clutch drag |
| An automatic gearbox usually contains a: | sun gear, planet gear and an annulus |
Created by:
DP450