Seven Major Misconceptions in the Use of Grease in Bearing Repair
Source: Bearing Network | Date: July 16, 2013
The use of grease in bearing repair is a critical aspect of maintaining mechanical systems. However, there are several common misconceptions that can lead to improper maintenance and even equipment failure. Here are seven major misunderstandings: 1. **Applying Grease on Gaskets**: Some technicians apply grease on cylinder head gaskets, believing it improves sealing. This is actually harmful. Grease can be squeezed into coolant or oil passages during tightening, leading to blockages. When burned, it may cause carbon buildup or damage the cylinder head, resulting in leaks. 2. **Using Gasoline Engine Oil in Diesel Engines**: Gasoline and diesel engine oils are formulated differently due to the varying operating conditions. Diesel engines require oils with higher anti-corrosion and antioxidant properties. Using gasoline oil in diesel engines can lead to rapid wear, oil degradation, and potential engine damage due to acid formation. 3. **Using Imported Oil in Domestic Vehicles**: Some car owners believe imported oil is always better. However, domestic vehicles often have different thermal expansion coefficients and clearance requirements. Import oils may not provide adequate viscosity or protection, leading to poor lubrication and increased engine wear. 4. **Forgetting to Add Oil to the Oil Pump**: When installing or replacing an oil pump, it's essential to add oil to the gear chamber. Without it, the pump cannot draw in sufficient oil, which can result in dry running, bearing damage, and engine failure. 5. **Assuming Blackened Oil Means It’s Degraded**: While blackened oil is often a sign of aging, modern high-quality oils contain additives that disperse sludge and prevent deposits. The color change does not necessarily mean the oil needs to be changed. Always check oil condition through testing rather than just visual inspection. 6. **Choosing Oil Based on Brand Alone**: Selecting engine oil should be based on specifications, not just brand reputation. New vehicles have strict oil requirements, and using the wrong oil can reduce performance and lifespan. Always follow manufacturer guidelines for viscosity and quality levels. 7. **Believing Multi-Viscosity Oil Is Always Better**: Multi-grade oils offer convenience by performing well in both cold and hot conditions. However, they are not always the best choice for every situation. Over-reliance on multi-viscosity oil can sometimes lead to unnecessary costs or suboptimal performance in specific environments. Proper understanding and application of grease and lubricants are essential for effective bearing repair and maintenance. Always refer to manufacturer recommendations and consider environmental and operational factors when making decisions about lubrication.
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