Repair of Fan Bearing Wear

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Fans inside computer cases often start to make more noise over time. This is usually due to bearing wear in the fan, especially when the bearing lacks lubrication. As the bearing hole becomes worn, the gap between the shaft and the bearing increases. Additionally, excessive axial play can cause the fan blade to move back and forth by a few millimeters. When the fan rotates, it may move axially and cause the blade plane to wobble, which not only worsens the wear but also creates a lot of noise. Most fan issues are caused by this kind of bearing degradation. While replacing the fan with a new one is the most straightforward solution, it's not always the best option for DIY enthusiasts. Also, finding an exact replacement can be challenging. However, this type of faulty fan is not beyond repair. Here’s a simple method to fix it using materials you might already have at home—like a small piece of aluminum can and some clean butter (make sure it's free of impurities). ### Steps to Repair Fan Bearing Wear: 1. **Clean the Fan**: Remove dust from the fan to prevent it from entering the bearing during reassembly. 2. **Remove the Seal**: Take off the self-adhesive seal on the bearing and remove the bayonet on the shaft. 3. **Clean the Bearing**: Wipe out any old oil or residue from the bearing using a soft cloth or tissue, and clean the shaft thoroughly. 4. **Apply Butter**: Put a small amount of clean butter into the bearing. Be careful not to use too much, as it could affect the fan’s speed. 5. **Create a Shim**: Cut a small piece of aluminum from a can, making sure it fits snugly around the bearing pin. Drill a small hole in the center so that it can slide over the shaft. Place this shim between the bearing and the bayonet to reduce axial movement. If the gap is large, add a few layers of the shim to keep the bearing movement under 0.5mm. 6. **Reassemble**: Reattach the oil seal, add a little more butter, and put the fan back together. Make sure all screws and nuts are tightened properly. After reassembling, power on the fan. You should notice a significant reduction in noise. With proper care, this repair can last up to two years. However, keep in mind that because of the limited precision in the process, the fan’s speed might decrease slightly. --- **Related Bearing Knowledge** - New plating process for anti-friction layer of sliding bearing (2) - Defects in the quality of bearing parts after heat treatment - The problem of NTN bearing faults and damages: A brief discussion on the five types of rolling bearings commonly used in the machine tool industry: the reason for the oscillation of the oscillating screen rolling bearing --- This article is linked from http:// Please cite China Bearing Network http:// Previous: The damage condition of the bearing and the reason for the next section: Viewing and working on the bearing work (2)

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