Understanding BMW 3 Series Axles: Types and Repair Process

BMW 3 Series is the key famous in BMW line-up and this is currently on its seventh generation which is launched in 2018. It is known for its luxurious interiors and advanced technology without any compromise on comfort. Each model offers different configuration which includes RWD and AWD. The types of axles configuration used in 3 series depend on the drivetrain setup.

Types of Axles in BMW 3 series

Front Axle

• Most of the 3 series models uses the MacPherson strut setup in front because it provides the stable handling and comfort ride.
• In xDrive model additional component is involved to transfer the power into front wheels.

Rear Axle

• In RWD models, it features a multi-link rear suspension to enhance the performance and comfort.
• It also includes a differential that allows the distribution of power in rear wheels.

How to Repair Axles?

Repairing the axles in BMW 3 series generally involves is diagnose of issue, removing the existing axle and replacing or repair the specific component with OEM parts. The process of repairing axles is quiet easy; just follow the process one-by-one:

Diagnosis

• First you need to look for the signs such as unusual noises while driving like, hammering, whining or grinding or sometimes uneven tire wear.
• Now, check for any kind of visible damage or leaks in the axle boots and make sure that the axle and the components around it are in good condition.

Removing Axle

• You need to lift a vehicle using the hydraulic lift to rise the safely and secure it with jack stands.
• After it is secured, you can now remove the wheel to gain the access of axle.
• Now, disconnect the suspension components one-by-one, depending on the location of axle. It may be necessary to disconnect parts of suspension to get the access of axle assembly fully.
• Use the accurate tools to lose the bolts which are holding the axle at its place. This may include the removing of bolts from the differential or hub assembly.

Inspecting and Repairing components

• You need to now check the CV joints for any kind of signs of wear, damage or leak. It they are faulty then this car parts needs to be replaced.
• If the CV joint is damage then you need to replace or prevent the debris from entering into the joint.
• Check the differential for any kind of gear damage which may require repair or replacement, as well.

Installing New or Repaired Axle

• If you are replacing then you need to place the new or repaired axle, carefully.
• Make sure that all the bolts are properly torque as per the manufacturer specifications.
• Now, you need to reattach the suspension component that you disconnected earlier.

Final Checks

• You need to now put the wheel back on rim and lower the vehicle by removing the jack stand.
• Appoint a test drive of your vehicle to ensure the axle repair was successful and there are no sounds or vibrations, anymore.
• After this crucial repair, don’t forget to check the alignment of wheels.

In The End

In summary, we conclude that repairing the axles of BMW 3 series can be bit difficult as it requires skill. Usually, it is recommended to have such kind of repairs by a qualified mechanic unless you have a skill and knowledge about it. Regular maintenance and inspection of axles can help in preventing axle related issue in future.