Seven Major Misunderstandings in the Application of Grease in Bearing Repair
Source: Bearing Network | Date: July 16, 2013
Grease plays a vital role in bearing maintenance, but there are several common misconceptions that can lead to poor performance and even damage. Here are seven key misunderstandings: 1. **Applying Grease on Cylinder Head Gaskets** Some technicians mistakenly apply grease to cylinder head gaskets, thinking it enhances sealing. However, this practice is not only ineffective but also dangerous. The gasket is designed to seal high-pressure gases, coolant, and oil between the engine block and cylinder head. If grease is applied, it may be squeezed into cooling channels or oil passages when bolts are tightened. Under high temperatures, the grease can burn, leading to carbon buildup and potential damage to the cylinder head. This can result in leaks and long-term engine failure. 2. **Using Gasoline Engine Oil in Diesel Engines** Diesel engines operate under higher compression and stress than gasoline engines, requiring specialized oil formulations. Gasoline engine oil lacks the necessary additives to protect diesel engine components, such as bearings made from materials like lead bronze. These parts are more prone to corrosion and wear if the wrong oil is used. Additionally, diesel fuel produces more sulfur compounds, which can form acids in the oil. Diesel oil contains antioxidants and alkaline additives to neutralize these acids, whereas gasoline oil does not. Using the wrong oil can lead to rapid oil degradation and engine damage. 3. **Using Imported Oil in Domestic Vehicles** Some car owners believe that imported oil is always better, especially for new vehicles. However, this assumption can be misleading. Many imported oils have lower viscosity, which may not meet the specific requirements of domestic engines. Additionally, domestic engines often lack oil coolers, making them more sensitive to oil thickness. Using thin oil can result in low oil pressure, inadequate lubrication, and increased engine wear. 4. **Not Adding Oil When Installing the Oil Pump** When replacing or installing an oil pump, it’s crucial to fill the gear chamber with oil before starting the engine. Without proper lubrication, the pump may fail to draw oil, leading to dry running and damage to the bearings. This is especially important for worn pumps, where the clearance between gears and the housing is already greater. 5. **Blackening Oil Means It's Degraded** Many people assume that blackened oil means it needs to be changed. While oil darkens due to oxidation and soot, this doesn’t always indicate it’s no longer effective. Modern high-quality oils contain detergents that keep contaminants suspended, which can cause discoloration without compromising performance. Always check oil condition through testing rather than just color. 6. **Choosing the Wrong Type of Oil** Selecting the correct oil is essential for engine longevity. New engines require specific oil grades based on their design, and following the manufacturer’s recommendations is crucial. Pay attention to both the viscosity grade and the performance level. High-quality oil reduces wear, extends service intervals, and improves overall engine efficiency. 7. **Assuming Multi-Viscosity Oil Is Always Better** Multi-grade oils offer convenience by performing well in a range of temperatures, but they aren’t always the best choice for every situation. While they provide good protection in extreme conditions, using them unnecessarily can increase fuel consumption. Choose the right viscosity based on your vehicle’s needs and operating environment.
Recommended Articles: - How to Extend Bearing Life - Carburized Bearing Steel - Common Issues with KOYO Bearings This article was originally published on China Bearing Network. Please visit [www.bearingnetwork.com](http://www.bearingnetwork.com) for more information. Previous: FAFNIR Bearing Code Guide (Part 1) Next: Shaft Hole Adjustment Methods
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