How to Fix Recurring Oil Leaks in a Centrifugal Fan Bearing Housing

Are you still struggling with recurring bearing housing oil leaks that waste lubricant and cause costly downtime?

In 90% of cases, the root cause comes down to these four issues:

1. Seal failure – the most common cause. Worn or aged oil seals, excessive labyrinth seal clearance, or grooves worn into the shaft journal allow lubricating oil to escape.
2. Lubrication system problems are also very common. An excessively high oil level, incorrect oil viscosity, or a blocked breather cap can create positive pressure inside the bearing housing, forcing oil out.
3. Design or installation defects, such as a cracked housing, poor sealing at the joint surfaces, or excessive bearing clearance, can become long-term sources of leakage.
4. Harsh operating conditions—including high temperatures, excessive vibration, or negative pressure drawing oil out—can accelerate seal failure and worsen leakage.

Different leak locations require different solutions. Identifying the exact source of the oil leak is the key to a permanent fix.