manual transmission section 2: Chapter 4, 5 ,6
When discussing Rzeppa CV joints. Technician A says that the inner race of the joint is connected to the drive axle. Technician B says that the ball bearings rotate on a trunnion within the outer housing. Who is correct?
A only
When discussing axle hub nuts. Technician A says that they are never to be reused after they have been staked. Technician B says that they should be chiseled off the stub axle if they are difficult to remove. Who is correct?
A only
When adjusting the installation angle of a rear Universal joint. Technician A installs shims between the differential's pinion shaft and the car's frame. Technician B repositions the rear axle housing on its spring pads. Who is correct?
B only
When diagnosing the cause of a clicking noise heard only when the car is turning. Technician A says that this can be caused by a worn axle torsional damper. Technician B says that this can be caused by a worn outboard CV joint. Who is correct?
B only
When discussing the Hotchkiss design of drive shaft. Technician A says that it consists of a small diameter solid shaft enclosed in a larger tube. Technician B says that it has a Universal joint attached to each end of the shaft. Who is correct?
B only
When discussing the cause of drive shaft vibration. Technician A says that excessive joint operating angles can cause an increase in shaft vibration. Technician B says that a two-piece drive shaft that is assembled out of phase can cause an increase in shaft vibration. Who is correct?
Both
When discussing the correct procedure for checking drive shaft runout. Technician A says that a drive shaft with excessive runout can be straightened by a drive shaft specialty shop. Technician B says that runout should be checked at the center of the shaft with the rear wheels hanging freely. Who is correct?
Neither A drive shaft with a bent tube must be replaced or re-tubed at a driveline repair shop that would cut the welds off at the weld yokes and weld in a new tube section and balance the shaft with the new tube in place.
When discussing slip joints. Technician A says that the yoke normally has external splines. Technician B says that the slip yoke is normally held in place on the transmission's output shaft by a snap ring. Who is correct?
Neither In most applications the output shaft of the transmission is externally splined and the slip yoke is internally splined. Since the effective length of the drive shaft needs to be able to change, there is no snap ring to retain the slip yoke as it must be able the freely move in and out while transmitting turning torque.
Technician A says a sticking inboard joint will cause the car to shimmy during acceleration. Technician B says a worn inboard joint will cause a clunking during acceleration. Who is correct?
both
The transmission extension housing's rear seal leaks. Technician A says that this could indicate a worn extension housing bushing. Technician B says that this could be caused by a damaged slip yoke. Who is correct?
both
While discussing reverse gear. Technician A says if the transmission has a synchronized reverse gear, the reverse synchronizer sleeve moves to engage with reverse gear. Power comes in through the input shaft, into the counter gear, through the reverse idler gear, and into the reverse gear on the main shaft. The reverse gear rotates the synchronizer sleeve, which rotates the hub and main shaft in a reverse direction. Technician B says if reverse is a nonsynchronized gear, a reverse-gear shift relay lever slides the reverse idler gear into contact with the counter shaft reverse gear and the reverse gear on the output shaft. The reverse idler gear causes the reverse output shaft gear to rotate counterclockwise. Who is correct?
both
While discussing the ways manufacturers try to reduce the effects of torque steer. Technician A says they sometimes use a combination of solid and hollow axles to help control torque steer. Technician B says some manufacturers divide the longer shaft into two pieces: one piece comes directly out of the transaxle and is supported by a bearing. The other piece is a half-shaft made to the same length as the axle on the other side of the car. Who is correct?
both
While removing a drive shaft from a RWD vehicle. Technician A installs a transmission rear plug into the extension housing to prevent the transmission from leaking while repairs are made. Technician B places an oil drain pan below the transmission's extension housing seal to catch transmission fluid as the drive shaft is being removed. Who is correct?
both
Which of the following statements about FWD drive axles is NOT true? a. The outer part of each drive axle is supported by a steering knuckle. b. The drive axle assembly comprises three pieces attached together in such a way as to allow the wheels to turn and move with the suspension. c. A short spindle shaft runs from the outer CV joint to mate with the wheel assembly. d. Half-shafts operate at angles as high as 40 degrees for suspension travel and 20 degrees for turning.
d. Half-shafts operate at angles as high as 40 degrees for suspension travel and 20 degrees for turning.
When discussing shift mechanisms. Technician A says that the detent system prevents the engagement of more than one gear at a time. Technician B says that the interlock system places the shift rail and fork in an exact position. Who is correct?
neither
When discussing the differences between RWD and FWD front-wheel bearings. Technician A says that most FWD cars use one tapered roller bearing, whereas RWD cars use two. Technician B says that most FWD front bearings are pressed onto the spindle end of the drive axle. Who is correct?
neither
When inspecting the gears of a transmission, a shiny wear pattern is found on the center of each gear. Technician A says that this was caused by worn shaft bearings. Technician B says that this was caused by worn synchronizers. Who is correct?
neither
While discussing axle hub nuts. Technician A says that all axle nuts are torqued to the same specification. Technician B says the best way to install a hub nut is with an air impact. Who is correct?
neither
While discussing FWD drive axles. Technician A says the axle shaft is connected to the differential by a fixed CV joint. Technician B says the axle shaft extends from the differential to an outer or plunge CV joint. Who is correct?
neither On FWD applications most inboard joints are the plunging joint and most outboard joints are the fixed joint.
When discussing overdrive gears. Technician A says that the typical ratio is 0.70 to 0.90:1. Technician B says that the typical ratio is 1.0:1. Who is correct?
A only
When discussing slip joints. Technician A says that they allow the drive shaft to change its effective length as the suspension goes through jounce and rebound. Technician B says that they are normally found at both ends of a Hotchkiss-style drive shaft. Who is correct?
A only
When discussing the phasing of Universal joints. Technician A says that this allows the speed changes at one joint to be canceled by the other joint. Technician B says that this means that both joints are positioned at opposite angles to each other. Who is correct?
A only
While diagnosing the cause of a squeaking sound coming from the driveline. Technician A checks for a dry or worn U-joint. Technician B checks for excessive clearance between the slip joint and the extension housing bushing. Who is correct?
A only
While discussing synchronizers. Technician A says that in automotive transmissions, the commonly used type of synchronizer is the block type. Technician B says that triple-cone synchronizers are not as effective because they are smaller than single-cone synchronizers. Who is correct?
A only
When discussing transmission repair. Technician A says that every part of the transmission should be carefully inspected, regardless of the problem. Technician B says that if the lubricant had traces of gold in it, it is very likely that the gears will be severely worn. Who is correct?
A only Reputable shops and technicians that warrant their repairs understand they have a responsibility to be thorough when completing repairs.
While inspecting a drive shaft. Technician A checks the entire length of the drive shaft for undercoating or dirt on the shaft, which may cause the drive shaft to be unbalanced, which would cause a vibration. Technician B says if the U-joints on a two-piece drive shaft are in good condition, that means that the U-joints are in phase. Who is correct?
A only Always do a thorough visual inspection, many times a technician with a keen eye can save a lot of diagnostic time.
Transmission fluid level and type are being discussed. Technician A says that the proper fluid level for a transmission is normally to the bottom of the filler hole. Technician B says that most manual transmissions require heavy gear lube for proper operation. Who is correct?
A only Due to the various materials and designs of synchronizers and blocking rings, the original fluid as recommended by the manufacturer is the only fluid to be used.
When discussing the possible causes for a shudder during acceleration. Technician A says that an inner CV joint could be the cause. Technician B says that insufficient differential gear backlash could be the cause of the problem. Who is correct?
A only In most cases a shudder on acceleration is usually caused by the inboard CV joint running in an elliptical orbit causing the shudder or vibration, also if the support bearings of the differential are worn the inboard CV joint may begin to rotate off-center and cause a shudder or vibration under load on acceleration
When inspecting the synchronizers of a transaxle. Technician A says that if the dog teeth of the synchronizer are slightly rounded, the synchronizer assembly must be replaced. Technician B says that the movement of the synchronizer sleeve on the shaft should be checked. Who is correct?
A only The synchronizer sleeve moves on the synchronizer hub and that movement would be checked.
When attempting to diagnose an imbalanced drive shaft. Technician A installs hose clamps around the shaft to offset the heavy spot. Technician B rotates the shaft on the pinion flange to another position. Who is correct?
A only Upon removal of the drive shaft it is necessary to mark the flanges so the shaft can be reinstalled to it's original position and prevent vibration (as on Page 270). If that is true; then, could Technician B also be correct? If the drive shaft had been previously removed could that be a diagnostic option? Let me know if you answered C- Both Technician A and Technician B. Also I believe a smartphone Ap. for NVH diagnosis would be a more efficient way to diagnose vibrations instead of the hose clamp method.
When discussing the different types of Universal joints. Technician A says that the most commonly used type uses bushings instead of needle bearings inside the u-joint caps. Technician B says that the double Cardan type consists of two U-joints connected by a coupling yoke. Who is correct?
B only
When discussing the different types of drive shafts that have been used to reduce vibrations. Technician A says that the flexible rope design is the most commonly used. Technician B says that the tube-in-tube design is not fitted with Universal joints. Note: Technician B is referring to the torque tube type design and not a standard tube-in-tube shaft. Who is correct?
B only
When discussing the procedure for servicing a tripod-type CV joint. Technician A says that this type of joint is always retained with a snap ring, which must be removed before the joint can be serviced. Technician B says that the location of the spider should be marked on the shaft before it is removed. Who is correct?
B only
While assembling a transmission. Technician A says end play, backlash, and preload cannot be set on newer transmissions and transaxles. Technician B says shims are used to set the end play and preload of the input shaft. Who is correct?
B only
While discussing universal joints. Technician A says the joint consists of two Y-shaped yokes plus a cross-shaped unit called the cross or spider. Technician B says the single Cardan universal joint assembly has four machined trunnions equally spaced around the center of the axis. Who is correct?
B only
While discussing shift forks. Technician A says most shift forks have two fingers that ride in the grooves on the outside of the speed gears. Technician B says each shift rail has three notches, which a spring-loaded ball or plunger rides in to give a detent feel to the shift lever and locates the proper position of the shift fork. Who is correct?
B only Correct. Most shift forks have two fingers that ride in the grooves on the outside of the synchronizer sleeve.
When discussing current trends in manual transmissions. Technician A says that six- and seven-speed transmissions reduce fuel economy because of the weight of their extra parts. Technician B says that some manual transmissions are shifted by internal solenoids and do not require a shift lever. Who is correct?
B only Modern automated (paddle) shifting transmissions do not have a shift lever and weigh less than an automatic transmission with the same number of gears.
When reviewing the service procedures for CV joints and drive axles. Technician A says that the axle can be used as a slide hammer to help remove a stubborn inboard joint from the transaxle. Technician B says that a drive axle should never be allowed to hang by its own weight during removal or installation. Who is correct?
B only Never use the axle as a slide hammer to aid in removal. Always support the axle shaft if the inner or outer ends are removed as axle damage could occur if the axle is left hanging.
When disassembling a transaxle, a severely worn second gear synchronizer blocker ring is found. Technician A says that this should have caused the transaxle to jump out of gear. Technician B says that this should have caused difficult shifting into second gear. Who is correct?
B only The blocking ring is a cone type clutch used to match the speed of the gear and shaft. With severe wear of the blocking ring it's ability to help speed up (or slow down) the gear to match the speed of the shaft would cause grinding and hard shifting.
When discussing the differences between the various designs of CV joints. Technician A says that most joints use the tripod design and all are basically interchangeable. Technician B says that the fixed tripod-type joint uses needle bearings, not ball bearings like the ball type. Who is correct?
B only The type of CV joint used by manufacturers vary by application.
When attempting to diagnose a vibration that is present only when the car is cruising at highway speeds. Technician A says that the problem may be caused by out-of-balance tires. Technician B says that the problem may be caused by a worn wheel bearing. Who is correct?
both
When diagnosing a vibration that becomes greater with vehicle speed. Technician A says that the tires may be out of balance. Technician B says that the drive shaft may be out of balance. Who is correct?
both
When disassembling a double Cardan Universal joint. Technician A says that each joint should be removed separately using the same procedures as for a single Cardan joint. Technician B says that the location of the parts of the centering ball joint should be indexed. Who is correct?
both
When discussing CV joints. Technician A says that they are called constant velocity joints because their rotational speed does not change with their designed operational angle. Technician B says that conventional universal joints cannot operate properly at the angles needed in a FWD axle arrangement. Who is correct?
both
When discussing the operation of a synchronizer. Technician A says that the synchronizer inserts force the blocking ring against the conical face of the gear, which slows the speed of the gear and allows for engagement. Technician B says that by matching the speed of the blocking ring and the gear, the synchronizer sleeve is able to engage with the gear dog teeth. Who is correct?
both
When discussing the power flow through a five-speed transmission when it is in first gear. Technician A says that power enters in on the input shaft, which rotates the countershaft that is engaged with first gear. Technician B says that the first gear synchronizer engages with the clutching teeth of first gear and locks the gear to the main shaft, allowing power to flow from the input gear through the countershaft and to first gear and the main shaft. Who is correct?
both
When discussing the purposes of the protective boot on a CV joint. Technician A says that the boot prevents contamination of the joint's lubricant. Technician B says that a manufacturer can specify boots of silicone or thermoplastic materials to withstand severe operating conditions. Who is correct?
both
When discussing universal joint speed fluctuations. Technician A says that universal joint speed fluctuations can be canceled if the driven yoke has the same plane of rotation as the driving yoke. Technician B says that universal joint speed fluctuations can be canceled by putting the joints in-phase. Who is correct?
both
When explaining torque steer to a customer. Technician A says that joints on the longer axle shaft operate at less of an angle than the shorter axle shaft. Technician B says that cars with more powerful engines tend to have more torque steer issues. Who is correct?
both
When inspecting a transaxle's gears. Technician A says that a shiny wear pattern on the center of the gear teeth is normal. Technician B says that it is normal for a reverse idler gear to have small chips on its engagement side but these do not affect operation. Who is correct?
both
When installing the shafts into the transmission case. Technician A says that the end play of the output shaft should be checked. Technician B says that the thrust washers and bearings should be lubricated prior to installing the shafts. Who is correct?
both
While calculating the first gear ratio of a five-speed transmission. Note: Reference Classroom Manual Chapter 2 material regarding basic gear theory. Technician A says to first divide the number of teeth on the front of the counter gear by the number of teeth on the clutch gear. Technician B says to next divide the number of teeth on the first speed gear by the number of teeth on the matching counter gear and then multiply the answer from the first set by the second. Who is correct?
both
While discussing power flow through the forward gears of a typical transaxle. Technician A says the main speed gears freewheel around the output shaft unless they are locked to the shaft by the synchronizers. Technician B says the main speed gears are in constant mesh with their mating gears on the input shaft and rotate whenever the input shaft rotates. Who is correct?
both
When discussing drive shaft design. Technician A says that the shorter the shaft is, the less likely it is to become out of balance. Technician B says that rubber inserts may be inserted into a tube-in-tube shaft to dampen the vibrations of the shaft. Who is correct?
both As the length, operating angles, or the speed of the shaft increases the need for balance increases. A tube-in-tube type shaft has an inside tube isolated from an outer tube with a rubber insert to reduce noises and vibration.
When diagnosing the cause of a clunking noise each time the vehicle is shifted from Drive to Reverse and back. Technician A says that loose rear control arms could be the cause. Technician B says that a worn U-joint could be the cause. Who is correct?
both Don't forget to also inspect engine and transmission mounts, exhaust hangars, and potentially loose items in the trunk area.
When discussing CV joint diagnosis. Technician A says that the complete failure of a CV joint may cause the vehicle not to hold in Park. Technician B says that a worn axle dampener assembly can cause a vibration while driving. Who is correct?
both If the connection between the transaxle and wheel is lost caused by a failed CV joint the vehicle will not hold in Park and also would not drive in forward or reverse.
When discussing shift problems. Technician A says that broken or worn engine and transaxle mounts can cause a transaxle to have shifting problems. Technician B says that poor shift boot alignment can cause a transaxle to jump out of gear. Who is correct?
both Many times a shifting problem could be caused by interference, misalignment or wear of drivetrain related components external to the transmission. Be sure to thoroughly complete vehicle inspection points.
When discussing transmission disassembly. Technician A says that the alignment of the parts of each synchronizer must be marked prior to disassembling the unit synchronizer assembly. Technician B says that most synchronizer hubs are splined to the shaft and are pressed on and off the shaft. Who is correct?
both Step 5 of the synchronizer inspection procedure (should be step 1) is to mark the sleeve and hub. Upon removal of the synchronizer hub, since damage will occur if not properly removed always refer to the service information before proceeding.
When trying to decide which is the most commonly used type of CV joint. Technician A says that the ball-and-socket type is the most common. Technician B says that the Rzeppa type is the most common. Who is correct?
both The Rzeppa and the ball type are the same type with a different name.
When reviewing the procedure for replacing an axle boot. Technician A says that the position of the old boot should be marked on the shaft before removing it. Technician B says that if the boot is dimpled or collapsed after the new boot is installed, a dulled screwdriver should be used to allow air to enter the boot. Who is correct?
both The proper boot position on the axle or joint housing should be marked (or take an image with smartphone) because after cleaning it the location to clamp it may not be apparent and also sometimes it is necessary to burp a boot.
