Why Do the Half Shaft Bolts Keep Loosening?
2 Answers
Possible reasons for the half shaft bolts frequently loosening are as follows: Unbalanced Drive Shaft: The imbalance of the drive shaft exceeds 100 g·cm, causing vibration during operation, which in turn leads to the loosening of the drive shaft bolts. Non-compliant Drive Shaft Components: The diameter of the flange's spigot does not meet requirements; the inner diameter of the flange bolt holes is too large; substandard drive shaft bolts are used. These non-compliant parts result in excessive clearance. When the engine speed changes, the bolts subjected to shear forces oscillate within the holes, making them prone to loosening.
The half-shaft bolts keep getting loose, which I think is quite common, mainly related to vehicle vibration, especially when driving on bumpy roads or at high speeds where the shaking is too intense, making the bolts prone to loosening. I've encountered this a few times myself, and each time I check, I use a torque wrench to confirm the tightness—if it's too loose, I just tighten it back. If the loosening repeats, it might be due to worn bolt threads or failed washers, requiring replacement. Prevention is simple: during regular maintenance, have the mechanic thoroughly inspect the suspension system, including bolt torque; after driving, listen for unusual noises—if there's a "creaking" sound, it's time to check. Don't underestimate this issue—if a wheel comes off, the car could lose control, which is especially dangerous on slippery roads in the rain. I always remind everyone to develop the habit of spending a few minutes before long trips checking the tightness of the bolts—it ensures safety, peace of mind, and extends the lifespan of the components.
