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Oil seals play an important role in maintaining the integrity of the engine. These components prevent oil or coolant leaks in the engine and prevent harmful contaminants such as dust, dirt, and water from entering the engine. Oil seals seal rotating parts, such as the crankshaft and camshafts, and also help protect parts from premature wear, ensuring smooth operation and optimal engine performance. |
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An oil seal is a circular seal made of flexible material that fits tightly around rotating shafts. The seal is made with a lip that is pressed against the rotating shaft by a spring. In addition, the fluid pressure provided by the design of the oil seal ensures extra sealing. Nowadays, PTFE oil seals are increasingly used. With this type of oil seal, no spring is applied and the flexibility of the material ensures the seal. In engine assemblies, oil seals are mainly found at the ends of the crankshaft and camshafts. They play a crucial role in maintaining engine lubrication and reducing the risk of wear due to contamination.
Installing oil seals requires precision, especially with PTFE variants. Keep them in their packaging until installation to prevent contamination and ensure that both the shaft and the sealing lip are perfectly clean and dry, free of grease or oil. Use the protective plastic sleeve or the appropriate installation tool. Carefully align the seal, and press it evenly into place. After installation, wait at least four hours before starting the engine to allow the seal to adjust to the shaft and ensure a proper and durable fit.
View the complete installation manual here
Oil seals are essential components that prevent fluid leakage while maintaining lubrication or cooling around rotating parts. The most common types are conventional spring-loaded oil seals. PTFE oil seals, which have been developed for higher speeds, temperatures, and modern lubricants. They are often used in modern engines due to these properties. Unlike traditional variants, PTFE seals do not require a spring thanks to their shape memory. Although conventional seals are still used, PTFE versions dominate in modern engines due to their improved durability and reduced wear, although they are more sensitive during installation.
Different engine parts require different types of oil seals, including:
Oil seals can deteriorate over time due to:
A defective oil seal often leads to visible oil leaks, which, if ignored, can cause serious engine damage.
Look out for the following symptoms:
We do not recommend continuing to drive with a leaking crankshaft oil seal. A leaking crankshaft oil seal can lead to:
Prompt repair helps prevent costly engine repairs and ensures long-term performance.
Wilmink Engine Parts offers OE-quality oil seals from reliable manufacturers, including:
These brands are widely trusted for seals in both OE and aftermarket applications.
The complete range of oil seals can be found in our webshop. If you have any questions or need assistance, please contact our technical specialists.
