Dorman 911-975 Secondary Air Injection Check Valve - Front

Overview of the Dorman Secondary Air Injection Check Valve

The Dorman 911-975 Secondary Air Injection Check Valve is designed to maintain proper air flow in the emission control system of select BMW models. Engineered with durable cast aluminum, this check valve supports efficient operation of the secondary air injection system in vehicles like the BMW 525i, 530i, X5, and Z4.

• Constructed from cast aluminum for strength and corrosion resistance
• Gray finish complements OEM components
• Inlet and outlet size of 0.83 inches for precise fitment
• Maximum pressure rating of 50 psi to handle system demands
• Reed valve type ensures reliable one-way air flow
• Operates effectively within a temperature range of -40°C to 125°C
• Includes one secondary air injection check valve and one gasket for installation

Detailed Product Description

The Dorman 911-975 secondary air injection check valve plays a critical role in the emission control system by preventing exhaust gases from flowing back into the air injection system. Made from cast aluminum, this valve offers durability and resistance to heat and corrosion, which is essential for maintaining performance in the demanding environment of the engine bay. The gray finish provides a clean, OEM-style appearance. Both the inlet and outlet ports measure 0.83 inches, ensuring compatibility with the air injection hoses on compatible BMW models. The reed valve design allows air to flow in one direction only, supporting the reduction of harmful emissions during cold engine starts. This valve is rated for a maximum pressure of 50 psi and can operate reliably in temperatures ranging from -40°C to 125°C, making it suitable for various driving conditions.

Compatible BMW Models and Applications

This secondary air injection check valve is compatible with several BMW vehicles, including the 525i, 530i, X5, and Z4. It is specifically designed to meet the emission control requirements of these models, ensuring proper function of the secondary air injection system and compliance with environmental standards.

Common Issues Addressed by This Check Valve

• Prevents backflow of exhaust gases into the air injection system
• Helps reduce emissions during cold starts
• Maintains proper air flow to the catalytic converter
• Prevents damage to the secondary air injection pump
• Supports overall engine emission control system efficiency

Installation Notes and Tips

Installation of the Dorman 911-975 check valve should be performed with care to ensure proper sealing and fitment. The package includes one gasket to help achieve an airtight connection. It is recommended to inspect the surrounding hoses and components for wear or damage during installation. Proper torque specifications should be followed to avoid leaks or damage to the valve. This part is designed for direct replacement on compatible BMW models, making installation straightforward for professional technicians or experienced DIYers.

Quality Assurance and Warranty

Dorman manufactures this secondary air injection check valve to meet or exceed OEM standards for fit, form, and function. The use of cast aluminum and a reed valve design ensures durability and reliable performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship, providing confidence in the product's quality and longevity.