BMW E90 330i N52B30 (Aluminum Tappet Cover) Engine

The BMW E90 330i N52B30 aluminium tappet cover is a robust and efficient replacement component designed to improve reliability and engine longevity in vehicles powered by BMW’s N52 3.0L inline-six engine. Replacing the original plastic valve cover, this aluminium version offers enhanced resistance to heat, cracking, and oil leaks, making it an ideal solution for long-term maintenance and performance stability. Whether used in daily driving or performance applications, this tappet cover delivers long-lasting protection and dependable sealing that supports smooth engine operation over time.

Key Features
High-Strength Aluminium Build – Constructed from durable aluminium, this tappet cover is built to withstand the high thermal and mechanical stresses of the engine bay. It offers a significant durability upgrade over the OEM plastic version, which is prone to cracking and deformation with age.
Exact OEM Fit – Designed specifically for the BMW N52B30 engine, this cover fits perfectly on the E90 330i without modification. It includes all factory-style mounting points and ports for sensors and ventilation systems, ensuring easy and secure installation.
Superior Seal Retention – Thanks to its rigid design, the aluminium tappet cover holds gasket pressure evenly, helping prevent common oil leaks around the valve cover area. This improves long-term reliability and helps maintain a cleaner, more efficient engine.
Heat Resistance – Aluminium’s natural ability to dissipate heat helps stabilize engine temperatures and reduces thermal fatigue on surrounding components, supporting engine health over time.
Long-Term Performance – With a solid, warp-resistant design, this component helps preserve the condition of the engine’s top-end components and contributes to a longer service life with fewer maintenance issues.

Performance & Applications
The aluminium tappet cover is an ideal solution for resolving known weaknesses in the BMW N52 engine’s original valve cover design. Many owners experience issues with the factory plastic cover, including cracks, oil seepage, and gasket failure. This upgraded aluminium cover is intended for direct replacement, offering superior material strength and a longer lifespan in demanding operating environments.

BMW E90 330i (2005–2011) – This model is powered by BMW’s naturally aspirated 3.0L N52B30 engine, which benefits from improved reliability with the use of an aluminium tappet cover. The upgraded cover maintains OEM sensor and breather compatibility while eliminating the common failures of the original plastic version, making it an excellent preventive and corrective maintenance upgrade.

Why Choose the BMW E90 330i N52B30 Aluminium Tappet Cover?
???? Durable & Heat-Resistant – Made from aluminium to withstand high engine bay temperatures, offering greater resistance to cracking, distortion, and oil degradation compared to plastic alternatives.
???? Leak-Free Operation – Helps prevent oil seepage by maintaining a consistent seal over time, reducing maintenance costs and keeping the engine bay clean.
???? Direct OEM Replacement – Engineered to match the original part in form and function, ensuring a hassle-free installation and full compatibility with factory components.
???? Enhanced Engine Longevity – By addressing one of the N52’s most common failure points, this cover helps extend engine life and reduces the risk of performance issues.
???? Practical Upgrade – A cost-effective and reliable choice for anyone looking to improve the reliability and service life of their BMW E90’s engine without compromising fit or appearance.

Conclusion
The BMW E90 330i N52B30 aluminium tappet cover is a smart and reliable solution for replacing the factory plastic valve cover in one of BMW’s most popular straight-six engines. Offering increased durability, better thermal management, and a tighter seal, this component helps avoid common valve cover failures while preserving OEM functionality. Whether you’re focused on long-term reliability or upgrading preventative maintenance, this aluminium tappet cover delivers consistent performance and peace of mind for BMW E90 330i owners.