Symptoms Of Broken Car Drive Shaft And How To Eliminate It-1
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Symptoms Of A Broken Car Drive Shaft And How To Eliminate It

Symptoms of a broken car driveshaft

Symptoms of a broken car driveshaft

  1. When the car starts or changes gears while driving, there is a crash sound on the transmission shaft, especially when the car is in a high-speed gear and the noise is more obvious when driving at a low speed.
  2. There is no abnormal noise on the drive shaft when the car starts, and the drive shaft has a crash noise when the car is running.
  3. There is no abnormal noise on the drive shaft when the car starts, but there is abnormal noise on the drive shaft when the car is sliding.
  4. The car makes constant noise during the whole driving process.

Analysis of the Failure Causes of the Broken

Automobile Transmission Shaft

Automobile-Transmission-Shaft
  1. The flange connections (or connecting bolts) of the drive shaft are loose, causing abnormal noise.
  2. The external grease nipples (commonly known as grease nipples), the oil passages of the cross shaft are blocked and the grease cannot be injected, the grease is not added on schedule, the oil seal of the cross shaft is damaged and oil leaks, etc. Working under the condition of lack of lubricating oil will cause excessive wear of the cross journal, needle roller and sleeve, resulting in looseness and abnormal noise.
  3. The universal cross shaft assembly is too tight.
  4. The sleeve and the fork hole of the universal joint are loosely matched, and the bolt of the support piece is loose, which causes the sleeve to rotate, which makes the fork hole of the universal joint wear too much, and the looseness causes abnormal noise.
  5. The splines of the second shaft of the transmission and the inner splines of the flange are worn too much, resulting in looseness and abnormal noise.
  6. The fixing bolts of the intermediate support bracket of the transmission shaft are loose, the intermediate support and the intermediate transmission shaft journal are loosely matched, the rear end splines of the intermediate transmission shaft are loosely matched with the flange keyway and the rear end nut is loose.
  7. The intermediate support bearing of the transmission shaft falls apart, the bearing raceway is damaged, the bearing is poorly lubricated, and the wear is excessive and loose.
  8. The installation position of the intermediate support bracket of the transmission shaft is skewed, the bearing preload is not adjusted properly, the rubber heat ring spacer is damaged, and the fixing screw of the intermediate support bracket is damaged.

The abnormal sound is caused by the deflection of the bracket position due to the excessive or small tightening torque of the bolt.

  1. The universal joint forks at both ends of the transmission shaft are not in the same plane, which will destroy the constant velocity arrangement and cause abnormal noise.

Fault Diagnosis and Troubleshooting of Broken Automobile Transmission Shaft

Broken Automobile Transmission Shaft
  1. The speed of the car changes suddenly while driving, and there is a metal knocking sound on the transmission shaft, which can indicate that the individual flange or universal joint cross shaft bearing is too worn and loose, causing abnormal noise of the transmission shaft.
  2. When the car starts, the transmission shaft makes a “just dang” sound or a cluttered sound. When the car reverses backwards on a gentle slope, it makes an intermittent sound of “grid horn”, which means that the paint needle is broken or broken, and the paint needle bearing should be replaced. Maintenance manuals, circuit diagrams, incurable diseases and other space diaries are updated regularly every day. Auto Repair Resources sells various auto repair books and electronic auto repair materials. Friends who purchase materials, please see the 00 space album to buy.
  1. When the car starts or shifts gears, the transmission shaft has obvious metal impact sound, and the low-speed gear is more obvious than the high-speed gear, mostly because the interference fit between the inner ring of the intermediate support and the shaft is reduced and the looseness causes abnormal noise.
  1. When the car starts or drives, the transmission shaft always has an obvious “click” abnormal sound, accompanied by vibration, which means that the fixing bolts of the intermediate support bracket are loose and cause abnormal sound.
  1. There is a crisp and rhythmic metal impact sound on the drive shaft when the car is running at low speed, and there is a clear sound when the car is out of gear and sliding. The pressing force of the multi-series universal joint bearing shell is too large, so that the bearing cannot rotate flexibly.
  1. When the car is running, the sound of the drive shaft increases with the increase of the vehicle speed, and the intermediate support bearing emits a dull and continuous turbid sound, which means that the intermediate support bearing falls apart due to excessive wear.

When the car is driving, the drive shaft emits a continuous “woo” sound. First, check whether the fastening bolts of the rubber gasket spacer of the intermediate support bearing bracket are too tight or too loose (not according to the specified tightening torque requirements), so that the position of the bearing bracket is offset. incline. The tightness of the bearing cap bolts can be adjusted to eliminate abnormal noise faults. If there is still noise after adjusting the bearing preload, check the lubrication condition of the bearing. Reinstall the bearing and bracket.

  1. During the driving of the car, the sound of the drive shaft is disordered and irregular, and sometimes there is a metal impact sound, which means that the universal joint forks at both ends of the drive shaft are not in the latter plane, which will destroy the constant velocity arrangement.
  1. There is abnormal noise on the drive shaft when the car is driving at high speed, and the abnormal noise of the drive shaft still exists when the car is out of gear and sliding, the raceway of the multi-series intermediate support bearing is damaged, or the installation position of the intermediate support bearing bracket is offset.
  1. In order to further verify the correctness of the above diagnosis, you can inspect and shake each part of the transmission shaft by hand when parking to check whether the installation position is correct, whether there are any scratches on the surface of the parts, whether the fastening connection is loose, and whether the matching clearance is too loose or too large. tight.
  • After parking, release the parking brake, and push the universal joint up and down by hand. If it is loose, it means that the needle roller bearing of the cross shaft is loose.
  • Shake the parking brake disc back and forth by hand. If it is loose, it means that the spline of the second shaft of the transmission is loose.
  • Tighten the parking brake, and move the rear flange of the intermediate drive shaft back and forth by hand. If it is loose, it means that the spline shaft key teeth of the intermediate drive shaft are loose.
  • Pull the flange of the intermediate drive shaft back and forth by hand. If it is loose, it means that the rear nut of the intermediate drive shaft is loose.

   10. During the driving of the car, if there is a heavy metal knocking sound on the transmission shaft when braking and decelerating, it means that the rear steel plate flute riding nut is loose

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