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Re: disasemble an axle from the transmission
The front drive-axles on your sentra are held in my circlips. Once you have the axle loose from the steering knuckle, you can get a big flat blade screwdriver between the inner CV joint and the transaxle housing and give the screwdriver a shot with a hammer or your palm and they will pop out of the transaxle. Use a lubricant (I use Sil-Glyde, but you can also use Vaseline) on the circlip when reinstalling. Push the stub with splines into the hole it was removed from and twist it to make sure that the splines are engaged and push the outer CV joint (where the axle nut threads are) toward the transaxle. You may need to tap with a rubber mallet to get the circlip to compress allowing the axle to go into the spider gear. If you don't have a rubber mallet, put the axle nut on the axle so that it is flush with the end of the threaded protion of the outer stub. This will help prevent damage to the threads.
Hope this is helpful!
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The transmission has to be removed. If it's a frobnt wheel drive car, the front axles have to be removed in order to remove the transmission.
The flywheel should be removed, too, and machined flat by an automotive machine shop. With the flywheel removed you may wish to replace the engine's rear main seal since it may leak oil.
The clutch often comes in a "key", which includes a new clutch pressure plate, clutch disk, and a "throw-out bearing" (used by the clutch fork to disengage the clutch). The kit may alos include a broze "pilot bearing", which is used to center the transmission's input shaft inot the engine crack shaft. The kit will include a placstic alignment tool to help the clutch disk while the new pressure plate is attached to the flywheel.
You may not like what I am going to say, but it is possible the axle is not going in far enough to lock. You should have to tap or knock the axle shaft into the transaxle to push the clip past the groove. It only takes a 1/4 inch to not be locked in, so it can look like it is seated. Of course it is possible something happened to the differential but not likely. There is also the chance the replacement axles are somehow different, but again not likely.
Clutch replacement will requre the removal of the transmission. If it is a rear wheel drive the trans can be removed fairly easily. Front wheel drive autos have the engine and transmission mounted in a "transerve" (across) fashion and require more time for removal. rear wheel drive requires the removal of the driveshaft (not difficult) and the front wheel drive requires the removal of the drive axles( can be difficlt). If your not mechanicly inclined and have a fair assortment of tools and equipment, this job is best left to a quailified person. You need Jack stands, floor jack, transmission adaptor, and if it's a front wheel drive, you will need an inpact gun to loosen the axle nuts on the drive axles.
The manual transmission in your Hyundai Elantra uses a clutch to engage and disengage the power from the engine to the transmission.
The clutch disc is sandwiched between the engine flywheel and the transmission pressure plate.
When you switch gears and let off the clutch pedal, there is a short period during which the clutch is slipping to transmit the power in a controlled way. This causes wear on the clutch; over time it will require replacement.
The procedure to replace the clutch is as follows:---
1) Jack up the Hyundai Elantra and place on jack stands.
2)Drain the transmission gear oil into a catch pan. To drain the gear oil, loosen the drain bolt with a ratchet.
3)Disconnect both drive axles (half shafts) from the transmission. Use a ratchet to remove the two bolts that hold the steering knuckle to the strut. Once those are out, you can easily pull the axles out of the transmission. The steering knuckle is the component that the wheel and strut attach to.
4)You can locate the two bolts to remove by following the strut down from where it's bolted into the engine bay Removing these two bolts allows you to pull the steering knuckle outward so you can pull the drive axle out of the transmission.
5)Remove the exhaust downpipe from the rest of the exhaust. It will be held on with two bolts at both ends and can be removed with a ratchet. Removing this piece is necessary to gain access to the transmission.
6)Disconnect the shifter cables connected to the transmission. Use a ratchet to remove each shifter cable and its housing.Remove the bolts holding the transmission to the engine block (there will be about seven or eight bolts). Place a transmission lift underneath the transmission to hold it and lower it down. If you don't have a transmission lift, you can use a transmission attachment for your jack.Shift the transmission back and forth until it drops onto the jack. Pull the transmission straight back, ensuring that no pressure is put on the input shaft, then lower the transmission to the ground. 7)Remove the pressure plate and clutch disc from the flywheel with a ratchet tool. Then remove the flywheel with a ratchet tool and replace it with a new flywheel. Alternatively, have your flywheel professionally machined at a machine shop then replace it in your car. Torque the flywheel down to the manufacturer's specifications.
8)Place the clutch disc on the clutch disc alignment tool and insert the tool into the flywheel input shaft hole. Connect the new pressure plate to the flywheel and torque the bolts. Once the pressure plate is torqued down, remove the clutch alignment tool. 9)Grease the new throw-out bearing and place it on the input shaft of the transmission. Once the transmission is installed, it will push against the pressure plate.
10) Reconnect all the parts which you removed while replacing the clutch.
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Suspect the clutch disc (which fits between the pressure plate and the flywheel) may have had it's center torn out which could prevent power from transferring into the transmission. You could also have a bad differential or a broken axle/CV-joint/universal joint. Another possibility is the drive from the clutch output down to the transmission could be damaged. In any case, it looks as if you are in for a major tear-down of the drive from the clutch onward. You can check for anything broken in either axle by setting the brake, blocking the wheels, and try to move the car with the engine while watching the stub axles coming from the differential case. If one of the axles turns, check outward for what doesn't. If neither turns, then the problem is inside the cases. Good luck!
The housing that the axles come out of is the transmission so if you lost fliud out of there, it's transmission fliuld if it's a manuel transmission you fill from the side of the transmission if it's an automatic transmission you fill it from under the hood in the dip stick tube good luck